with the three senshi changing sexes all the time, and Mamoru disappearing for absolutely no reason.... only for us to find out in the last couple of episodes that he had been dead the whole time. (Well, if it's true the producer hated Mamoru, I bet he was giddy as hell that entire season... even after he'd turned the guy back into Usagi's abuser.) And that last battle dragged on almost as much as the showdown with Quercus Alba. Yeah, we get it. Knock her down a million times, take away all that she holds dear, and she'll still get up and fight. Well, I don't know if there was any deviation from the manga with that particular battle, but they could have handled it better.

Mamoru and Usagi bickered a lot less in the manga and quickly fell for each other. Mamoru was also not as cool or distant towards her. That was all made by Kunihiro and his dislike for that guy.
Incidently, Kunihiro also didn't like Chibiusa very much...

Zoisite and Kunzite are not gay lovers. Nephrite also does not fall in love with Naru.

Mamoru is in High School, not College. There is only a 2 - 4 year difference between him and Usagi.

Rei and Mamoru never go on dates. Blame Kunihiro for that anime invention.

Rei also doesn't bicker with Usagi as much as in the anime.

Venus originally posed as Princess Serenity with a crescent moon on her forehead, to fool the enemies and keep Usagi safe until she regained her memories.
This was removed in the anime, Venus joined as Venus and nothing more.

During the time of the Moon Kingdom, Endymion was fatally injured during the war. Serenity, shocked at his death and full of emotion, committed suicide.
The anime had both simply killed by Beryl's army.

Venus and the others go to the moon and speak to a hologram of Queen Serenity, learning of their past some more and obtain a sword. Venus eventually kills Beryl with that sword. The sword is completely absent from the anime. Beryl does not get killed until the last episode of the season.

Mamoru gets turned evil, actually kills Motoki's friend Endou and takes his place, manipulating everyone. He plays on Usagi's emotions and gains access to the girls' secret base which is underneath the Crown Arcade.
Changed in the Anime, Evil!Mamoru is just walking around at times and the girls have no real secret base. They just meet at Crown Arcade or Crown Parlor a lot.

During a fight with Evil!Mamoru/Endymion, Sailor Moon's only way to end this horrible thing is... to kill Endymion and then commit suicide. She even wonders if all they can do is repeat their previous lives.
Not in the anime, Endymion gets killed by Beryl protecting Moon and Moon dies at the end of the season.

Moon and Mamoru are still alive, thanks to the Silver Crystal and are inside Metallia, who is currently taking over the world. To try and save Moon and Mamoru, Venus and the others lay down their transformation pens' energy, which is practically their life, and die, helping them. Mamoru is alive, but blind. Moon uses the Silver Crystal to destroy Metallia once and for all, the Crystal's bright light heals Mamoru's eyes and Usagi dies. A kiss resurrect her.
None of that happens in the anime. The girls get axed off one-by-one, Mamoru dies at Beryl's hands and Usagi fights Beryl-Metallia on her own, but still uses the Silver Crystal to defeat her. The usage is so strong it kills Usagi, which releases the Crystal's power of resurrecting them all.

After that previous stuff in the manga, the girls are resurrected, Usagi's brooch became a new one and she and Mamoru go to the Moon, where the Moon Kingdom has been reborn. But Usagi chooses to stay simply Usagi and live on earth with Mamoru.
In the Anime, the Moon Kingdom was never reborn and the brooch doesn't change until next season.

The entire part of Ail and Ann, the Doom Tree and such did not exist in the manga. That was a filler season made so that Naoko could draw enough of the next arc, so they could turn it into an anime.

Also, due to the differences in how the manga and anime ended, the manga did not have the girls lose their memories or Mamoru turn into the Moonlight Knight. So that whole thing just... nah, doesn't exist. Ditto on Usagi getting the Silver Crystal power during that season, she obtained that in the last chapter in the previous arc of the manga.

In the manga, Sailor Moon's new Rod is born from the love between her and Mamoru.
The anime had a memory-flashback-vision-thing of Queen Serenity give her the new rod.

Chibiusa carries a Silver Crystal around her neck, similar to a necklace that Usagi wore in the first arc. It's Usagi's Silver Crystal from the 30th Century and Chibiusa is trying to steal Usagi's 20th Century Silver Crystal.
In the anime, Chibiusa touched the 30th Century Silver Crystal and it disappeared, going inside of her body.

The four sister of the Black Moon are simply killed in the manga, but manage to capture Mercury, Mars and Jupiter to the Black Moon.
The anime purifies them into normal humans.

Due to the capture, Venus, Moon, Chibiusa and Tuxedo Mask are the only ones to go to 30th Century Crystal Tokyo and meet up with King Endymion. We find out Chibiusa is Endymion and Serenity's daughter, princess of Crystal Tokyo and actually 901 years old. Usagi gave birth and ascended the throne at age 22, the Silver Crystal basically prolonged everybody's lifespan to a good 1000 years or longer.
The anime has everybody going to 30th Century Crystal Tokyo. Exactly how old Chibiusa is isn't mentioned, but we can assume that she is not 901 years old. The Silver Crystal expanding everyone's life is also not mentioned.

Tuxedo Mask actually became action-oriented in the manga and gained an attack, with the help of King Endymion, called "Tuxedo La Smoking Bomber".
In the anime, Tuxedo Mask was a powerless guy with nothing to do except his schtick of throwing a rose, spouting phrases and sometimes helping the soldiers.

In the manga, Chibiusa is bullied and made fun of in Crystal Tokyo because she doesn't look like the Queen and has no power, despite being the daughter of a powerful Queen and Soldier.
In the anime, Chibiusa had too much power.

Diana, Chibiusa's kitten and the child of Luna and Artemis, appears.
In the anime, she doesn't show up until the fourth season.

There is no real romance hinted at between Petzite and Saphir. Saphir also does not turn good. He and Esmeraude got freaky, superstrong hands by Wiseman. Saphir tries to kill Sailor Moon, whom he blames for how his brother has changed, but fails. Eventually, he gets forced by Wiseman to attack his brother, but Demando kills him.
In the anime, Saphir turned good, distrusting Wiseman. When trying to tell his brother about how Wiseman was using him, Wiseman kills him. Cue Petzite crying.

In both versions, Demando captures Usagi and takes her to Black Moon.
In the manga, Usagi escapes, runs into Saphir who tires to kill her. Neo Queen Serenity's spirit gives Usagi power and she manages to transform and can sense Mars, Mercury and Jupiter being held prisoner close by. She gets them out.
In the anime, Usagi gets captures and Tuxedo Mask has to save her.

Chibiusa gets manipulated and taken in by Wiseman when she loses the Key of Time needed to traverse. Wiseman uses her inferiority complex and all the bullying she had to endure to turn her into Black Lady. Mamoru goes after Chibiusa and gets taken in by Black Lady.
In the anime, Wiseman manipulated Chibiusa into thinking that her parents and nobody ever loved her.

In the manga, Black Lady smacks Luna-P away, seeing it as a childish toy.
In the anime, she kept and used it, saying it was her only friend.

By the way, the kiss between Black Lady and Evil!Mamoru in the manga is real.
In the anime, just an illusion to shock Moon.

Pluto had a huge role.
Demando, after having killed Saphir and realizing that Wiseman is just using him, grabs the 20th and 30th Century Silver Crystals and plans to have them touch each other, combining them into one supreme Silver Crystal, so he could rule the world. Since both objects are actually the same - the power is consistent throughout time - this would cause a huge Paradox and destroy the Universe. Pluto, realizing that they are all doomed, breaks the highest Taboo she has as protector of Time. She stops time and tells Usagi to grab the two Crystals. Pluto dies...
In the anime, Pluto barely appeared and this didn't happen.

Pluto dying, calls out to Small Lady. Black Lady, stirred with memories of how Pluto was her only friend, shatters the control Wiseman had over her and she cries, revealing her own Silver Crystal and she grows older, becoming Sailor Chibimoon for the first time.
In the anime, Usagi has to become Neo Queen Serenity to break Chibiusa's manipulation on not being loved. The Silver Crystal inside of Chibiusa shows up and they defeat Wiseman, but Chibiusa does not manage to transform into a soldier.

Neo Queen Serenity awakens and gives the girls new power and gives Sailor Moon her third brooch. She also goes to meet Usagi at the Door of Time, despite it being forbidden and they bid farewell. Shortly afterwards, Chibiusa returns to the 20th Century, giving Usagi a new Rod and staying behind to train as a soldier.
In the anime, none of this happens...

There is no search for Pure Heart Crystals or Talismans. Uranus and Neptune already have their two Talismans, the Sword and Mirror. They are searching for the third Talisman.

Hotaru is a cyborg. Her father experimented and operated on her after the lab accident that killed his wife, injured his daughter and himself. His original plan was to create super-humans which are part machine and part human. He made a deal with Germatoid and became his host, letting Hotaru become Mistress 9's host. Despite being only about 12 years old, Hotaru looks older.
In the anime, Hotaru is simply a dark girl with frail health and a nice heart. She has some attacks sometimes.

Haruk and Michiru, as themselves and Uranus and Neptune, are hostile towards the other soldiers. Only Haruka is nice to Usagi and Michiru to Mamoru. Usagi gets jealous of Michiru and Mamoru jealous of Haruka. But things quickly patch up.
In the anime, Haruka and Michiru were rather nice towards the others. It was only in transformed form that they were mean and hindered them.

The line of Uranus being "both a man and a woman" to my knowledge does not appear in the anime. But it's a symbolic phrase, meaning she is a woman with the strength of a man. Uranus is not a hermaphrodite, no matter what morons are saying!

Uranus and Neptune accept Usagi as the moon princess and there is no need to somehow prove that she is the Messiah.

Uranus and Neptune also explain things about the Moon Kingdom. They and Pluto were protectors, living on their own respective planet, to stop any danger from approaching the Moon Kingdom. They were not supposed to be reborn when Queen Serenity used the Silver Crystal. They were reborn by accident.
In the anime, they explain nothing like that.

Pluto is back and with slight changes to her uniform. She stays throughout the seasons and longer.
In the anime, Pluto appeared and died a few episodes later, after stopping time to rescue Uranus and Neptune from an exploding helicopter.

Uranus, Neptune and Pluto explain their duties and what the talismans do. The talismans, when brought together, will summon the legendary Soldier of Death - Saturn. The talismans summoned Saturn back during the Moon Kingdom and she destroyed the kingdom. This time around, they plan to summon Saturn and kill her because they do not want to see her destroy the world again.

Professor Tomoe turns into the daimon Germatoid and gets killed.
In the anime, Germatoid removed itself from Tomoe's body and got killed. Tomoe himself survived.

When Mistress 9 takes Chibiusa's Silver Crystal and swallows it, Hotaru is still inside and tries to protect Chibiusa's soul from being consumed. Later on, Mistress 9 also swallows the souls of the four soldiers. Hotaru tries to protect them all, but lets them all go back to their bodies and disappears...
In the anime, there was a sort of off-and-on hint that Hotaru may still be around, but not until towards the end does Hotaru break through Mistress 9 and becomes herself again.

During the time when Chibiusa's soul is taken, she is actually dead. She's kept alive by Mamoru holding her hand and him using his energy to keep her body technically alive until her soul returns. See, in the manga, it's shown that Mamoru has powers - he can heal minor injuries and similar.
In the anime, the same thing happens, but the whole deal with his powers is never explained.

Sailor Moon becomes Super Sailor Moon through drinking from the Holy Grail, which only works when all nine soldiers and their hearts come together.
In the anime, the Holy Grail came together when all three Talismans were brought together.

Speaking of Holy Grail, when Chibiusa regains her soul, she goes to join the soldiers in battle. A second Holy Grail appears and Chibiusa becomes Super Sailor Chibimoon.
In the anime, Chibiusa was practically dead until the end. She did not become Super until next season.

The ending is very different.
In the manga, Mistress 9 summons Pharao 90 who begins to swallow Tokyo and practically the whole world. Mistress 9 gets killed. Uranus, Pluto and Neptune notice that their Talismans are shining... and out of Mistress 9's corpse arises Sailor Saturn. Realizing that they have no future, Sailor Saturn begins to use Death Reborn Revolution, destroying the humans and buildings... but tells them that for rebirth, there must first be death. Usagi turns into Neo Queen Serenity and uses her power and that of the Silver Crystal to rebirth the place and humans. Saturn, realizing that Pharao 90 cannot be stopped, tells Pluto to trap her and Pharao 90 into a separate Dimension. Pluto sends Saturn and Pharao 90 into another dimension with Dark Doom Close.

In the anime, Pharao 90 is sort of there, but he's not that big of a threat. Saturn arrives and says that she will battle Pharao 90 herself by going inside of him. She leaves and Usagi tries desperately to become Super Sailor Moon. She succeeds and enters Pharao 90. After an off-screen battle, she appears in Tokyo's ruins, dead eyed and holding a reborn infant Hotaru.

Hotaru does get reborn and is an infant in the manga as well. Haruka, Michiru and Setsuna vow to raise her, now that she is parentless. The four leave, to return when they are needed again.
In the anime, Hotaru gets raised by Tomoe for a while. But she doesn't get raised by Haruka and the others until the beginning of the fifth season, when Setsuna simply shows up in front of a recovering Tomoe and takes his daughter.

Fisheye, Hawkeye and Tigereye are all actual animals that were transformed by the Amazon Quartet. The Amazon Quartet are the main villains prior to the big bad in the manga.
In the anime, the three appear first and the Amazon Quartet doesn't appear until halfway through.

Moon and Chibimoon have to be in their Super form to defeat the enemy. But what with the Outer Senshi leaving, they cannot activate the Holy Grails. Pegasus, who appears in front of Usagi and Chibiusa, gives them their new powers and turns two kaleidoscopes they had into their new weapons.
In the anime, Pegasus gives them their new powers, too, but first it's only temporary. For the real upgrade, Chibiusa gains the Crystal Bell to call him, while in the manga she, too, could use Moon Gorgeous Meditation.

None of the soldiers can transform part-way through the story, except Moon and Chibimoon.

Fisheye is not gay.

We see Artemis and Diana's human form. Artemis when he gives Venus her Venus Crystal and Diana during a ceremony at the end of the arc. We also see Luna's human form, but this is her second appearance. The first time was during a side-story "Princess Kaguya's Lover" during the last arc.
In the anime, the only human form of the cats we ever see is Luna's. And that only in the second movie.

With dreams being the theme in this arc, each of the soldiers tells us about her dream. While the enemies try to trick them with illusions and what their "real" dream is, the soldiers see through them and gain their super forms. The Super form comes from a crystal inside of them, which it turns out is a Starseed for next season. They gain the crystal through their guardians and similar. Mercury and Jupiter gain their Crystals from their mini-Mercury/Jupiter guardians. Mars from Phobos and Deimos, who have mini-human forms and were assigned to serve Mars in their previous life. Venus gains hers through Artemis.
In the anime, they gain their Super forms through Pegasus when they begin to trust him.

The Outer Senshi are actually in the manga! Haruka, Michiru and Setsuna are living together in a big house, wearing identical rings as a promise to raise Hotaru well. Hotaru, who learns the violin and can create visions when playing, awakens as Sailor Saturn and ages rapidly. She gives them their Crystals and they turn Super, too.
In the anime, the Outers never appeared in this season.

The manga focused on Sailor Moon again.
The anime focused a lot more on Chibiusa. She obtains not just a Crystal Bell from Pegasus, which she uses for Twinkle Yell - where as in the manga it was a small glass bell to call him, but also eventually a Stallion Rêve. A little device that lets Chibiusa and Pegasus talk to each other when they're alone. There is a lot of focus on their growing friendship, and eventual romance.

The Amazon Quartet fight the girls and Saturn tells them to awaken soon. They end up locked in balls and at the end of the arc, when Saturn asks Usagi to save them, they appear and turn out to be the Sailor Quartet, named after Asteroids. They say they are Chibiusa's guardians and will become her comrades and team, once she has fulfilled her training as a soldier.
In the anime, the girls are simply girls who got power through Nehelenia. At the end, they get turned into normal girls.

Chibiusa and Usagi change ages for a bit.
In the manga, Chibiusa and Usagi envy each other. Chibiusa wants to be an adult already, with the curvy body of an adult and not be ordered around and all, while Usagi envies Chibiusa for being a kid with no responsibility to worry about.
Palla Palla uses magic to turn them into each other's age once they de-transform after a battle. Usagi is a child and Chibiusa a teenager. Leads to some hijinks and a fun scene where the girls are worried that Black Lady is back. Chibiusa uses Luna-P to confuse Usagi's family, making them think she is Usagi.
The magic disappears once Chibiusa and Usagi re-transform.

In the anime, Chibimoon and Moon argue with each other and Palla Palla changes the two. Things aren't as bad, until night. Chibiusa dreams that she cannot contact Pegasus and, in her dream, Pegasus tells her that her pure dream of being a lady was fulfilled and now he would not be able to contact her anymore. Chibiusa hates this and manages to remove the spell, turning into a child again. Pegasus kisses her, showing her his Helios form.

Speaking of the kiss, the reasons were different.
In the manga, right after managing to revert their ages, Chibiusa calls Helios with the Crystal Bell and tells him that she can't be the maiden he is looking for. Helios reveals the vision he had, telling him of the maiden with the pure dream and reveals that the vision came from "Serenity". Chibiusa, realizing this means Usagi, runs away. Helios follows her and Chibiusa pours her heart out, how she feels she isn't needed and that Sailor Moon is always the one to do everything. Helios proves to Chibiusa that she is needed, that the others are worried and kisses her to calm her down.

In the anime, the kiss is described above and... fels kind of like Pegasus was just happy that Chibiusa was in a child form again... creep.

The plot is entirely different.
In the manga, Nehelenia wants to kill everyone of the White Moon family. She has taken the priest Helios and fused him with his pet pegasus, trapping him in the pegasus form. Helios is searching for a Maiden with a Pure Dream and Bright Spirit, who can unlock the Golden Crystal. Helios and Mamoru are both protectors of the Earth, but with different duties technically, and share a symbiotic connection.
Mamoru is suffering from a disease which shows itself as black rose-shadows in the lung. Helios has the same disease. Worried that Usagi may catch it, too, he distances himself from Usagi. It doesn't help as Usagi would rather be with him and suffer the same disease than leave him.
The vision Helios had of the maiden that can unlock the Golden Crystals refers to Usagi and Chibiusa. It turns out that the Golden Crystal is inside of Mamoru, his starseed, and one inside Helios. Usagi unlocks the Golden Crystal inside Mamoru, while Chibiusa unlocks the one inside Helios.
There is a sort of ceremony at the end of the arc, after Nehelenia has been defeated, where Serenity and Endymion are... doing something. It turns out that every soldier is the princess of their respective planet.

In the anime, Zirconia is using the Amazon Trio to search for Pegasus inside of dreams, which are shown as Dream Mirrors. When the Amazon Quartet arrives, they are searching for a specific dream, with the border being Golden. Nehelenia has captured Helios and keeps his naked body suspended in bondage-spider threads all the time. But his soul, in the form of a pegasus, is gone and hidden in that dream. And she wants him.
The Golden Crystal is Helios' horn. When Nehelenia gets Helios' body and soul together, she takes the Golden Crystal.
The collected power of dreams stalls Nehelenia and causes her to age. Disgusted at her old self, Nehelenia goes inside a mirror, after throwing an unconscious Chibiusa down from the tent. As she falls, Sailor Moon goes after her. Grabbing her, she begs Chibiusa to wake up and use the Golden Crystal, as only she can actually use it. She does and the two land safely on the ground.

At the end of this arc, Sailor Moon manages to transform into her Eternal form. The others also change into Eternal uniforms.
In the anime, Moon doesn't become Eternal permanently until next season and the others never get the uniforms. They remain Super for the rest of the series.

The first few episodes about Nehelenia were an anime-invention. Nehelenia was killed off in the manga during the last arc, whereas in the anime it was still sort of left open. What with this episodes missing, Moon was already Eternal at that point.

Haruka and Michiru go to the same school as Usagi and the others now.
In the anime, the Outers were kinda gone for a while until some episodes in.

The Three Lights are women who dress up as men to attract more women with their concerts, hoping their song would reach out to their Princess Kakyuu, who they are searching for.
In the anime, the Three Lights are men, with male bodies and turn to their real female form when transforming into the Starlights.

The anime omitted some Animamates like Sailor Heavy Metal Papillon, Sailor Lethe and Sailor Mnemosyne. Sailor Phi and Sailor Chi are also omitted, although they are not really animamates.

Chibiusa leaves for the 30th Century a few chapters into the arc.
In the anime, she left at the start of the season.

Mamoru leaves for America to study and says goodbye to Usagi at the airport, giving her an engagement ring. He gets his starseed taken by Galaxia, killed in front of Usagi. Usagi, shocked, faints and gets taken home by Seiya and fools herself into thinking that Mamoru left perfectly okay on the plane.
In the anime, Mamoru boards the plane and flies off. The plane stops and his starseed is taken by Galaxia, killing him, but this is not revealed until pretty much the end of the season.

Seiya never had any romantic inclination towards Usagi. That was a creation for the anime. There was one kiss Seiya gave her, but it was entirely platonic.

Chibi Chibi manages to say more than just "Chibi" as the arc progresses, talking normally.
In the anime, it's just Chibi or Chibi Chibi... sometimes a word repeated, but that's it.

Galaxia's reason for collecting Starseeds is that, on her planet, the people were greedy and she killed them all. She was searching for a star that shone brightly, one she could claim her own. She found it, as Sailor Moon's, seeing the light during the ceremony from the last arc. She collects all the Starseeds from every soldier in the universe, having destroyed countless planets before hand, including Kinmoku - the planet the Starlights come from.

Galaxia collects the Starseeds from the soldiers pretty fast and only targetting them. She kills off Mercury and Jupiter fast, then Mars and Venus. The Outer senshi get killed off off-screen. Pretty much, every soldier gets killed really, really fast. The only surviving ones are the Starlights, Chibi Chibi, Usagi and Princess Kakyuu.
In the anime, Galaxia has her minions search for real Starseeds. Of course, they all grab false ones... it isn't until towards the end of the season when the soldiers get killed off pretty fast.

Princess Kakyuu turns out to be a Sailor Soldier herself. Shortly after revealing herself as a soldier, she gets stabbed by Sailor Phi.
In the anime, Kakyuu was just a princess and died pretty fast, too.

Sailor Tin Nyanko forces Luna, Artemis and Diana into their humans forms and injures the moon symbols on their forehead, ridding them of their ability to speak and become normal cats. Usagi asks her mother to take care of all three cats for now.
In the anime, this doesn't happen.

Moon, the Starlights, Chibi and Kakyuu travel to the center of the universe to the Galaxy Cauldron to fight Galaxia. On the way their, Moon's memories are wiped for a bit and Sailor Lethe kills the cats in front of her.
Doesn't happen in the anime.

At Galaxia's, she has used the soldiers' Starseeds to revive them as her minions and they fight Sailor Moon, including Mamoru.
In the anime, it's only Uranus and Neptune who turn evil and that's by their own free will. They originally wanted to trick Galaxia, then use the bracelets to remove Starseeds on Galaxia herself, but failed and got killed.

In the 30th Century, Chibiusa realizes that something is wrong and decides to travel back in time to help Sailor Moon, despite her mother's orders. The Sailor Quartet arrive and follow Chibiusa. Chibiusa arrives at the Galaxy Cauldron and rescue Sailor Moon with the Quartet.
In the anime, Chibiusa never appeared again once she left.

As above, Galaxia pushes Mamoru into the Galaxy Cauldron, destroying his body and Chibiusa vanishes into thin air, ceasing to exist.
In the anime, never happened.

The Starlights get killed shortly after Kakyuu, resulting in Moon, Chibi Chibi and the Quartet to be the only surviving soldiers next to Galaxia at the end.
In the anime, the Quartet never existed and the Starlights were the few that did survive until the end.

Galaxia gets defeated and Moon is told that she has to destroy the Galaxy Cauldron, as all the previous villains came from the Chaos inside of the Cauldron. And if she did not defeat it, Chaos would eventually break out.
In the anime, no Cauldron. Galaxia was possessed by Chaos.

Chibi Chibi is very different.
In the manga, Chibi Chibi reveals herself to be Sailor Cosmos. A soldier who looks very similar and yet different from Sailor Moon. Sailor Cosmos came from the future, where war was raging and she was fighting Sailor Chaos. But she was losing and decided to go back in time, to a time where Chaos had not broken out yet and to comfort "her past self" who was lonely herself. She wanted to persuade Moon to destroy the Cauldron, something that she said was a "mistake" she had not made previously, so the future would change where Chaos would not break out and the war would not happen.
But Moon, realizing that the Galaxy Cauldron is where stars are born and reborn, decides to not do so because then, the people who were dead could not be reborn. Moon decides to use her whole power and purifies the cauldron. Who is Cosmos? Is she Sailor Moon, a future form of Sailor Moon, a different Sailor Moon or what? We don't know, it's left intentionally vague...

In the anime, Chibi Chibi is a human form of Galaxia's Starseed. When Chaos took over Galaxia, she dispelled her own Starseed and hoped for it to shine on as the Light Of Hope somewhere else. To somehow help. Chibi Chibi becomes a sword that Moon uses to fight Galaxia, but gets killed.

Usagi awakens inside the Cauldron and sees Guardian Cosmos as well as all the other soldiers. Cosmos gives Usagi a choice: She can be reborn as a normal person or continue the life she has now as Usagi and Sailor Moon. Usagi chooses to remain herself right now and sees Chibiusa's starseed, telling her that she'll be "waiting in the future".
Usagi wakes up in bed and the manga ends with her and Mamoru's wedding and Usagi realizing that she is pregnant. Mamoru thinks how Usagi will continue to shine on as the legendary bright star of Sailor Moon.
None of that happens in the anime.

In the anime, everyone gets revived and the Starlights leave with Princess Kakyuu back to Kinmoku. The anime ends with a monologue of Usagi's, similar to a monologue at the beginning of the series. In the beginning, she described herself as 14 year old Tsukino Usagi, who was a crybaby and a bit spoiled and lazy. In the end, she describes herself as 16 year old Tsukino Usagi, who was a crybaby, a bit spoiled and lazy and is also the legendary Sailor Moon, showing how she was still herself, despite her new "role".