I think Ghost Trick and Ace Attorney could be somehow connected.

I would like to hear the origin of spirit channeling. Maybe it would have some connection to meteorites too? However I wouldn't like any of AA cast to meet ghost, except Maya and people seeing spirit medium channeling it. I think it would be great if we would get possibility to control bodies of others (as ghosts of humans or ghost channeled by spirit mediums).

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FMA and PW.

I want this crossover so bad, you can't even believe it.

Or a Ghost Trick-crossover with PW is great too.

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well the ghost trick crossover *might* happen

"In an interview with Official Nintendo Magazine in 2013, Takumi said that he'd love to make a crossover video game between Ghost Trick and his other series, Ace Attorney, speculating that Phoenix Wright could be killed, while his killer would be prosecuted by Sissel"

or maybe he's screwing with us... anyways, it sounds like several shades of awesome
pleeeeaaase capcom

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I actually wrote a FMA/AA crossover once. I never finished it, and it was not at all realistic, but it was still an FMA/AA crossover.

And by not realistic, I mean that the fourth wall doesn't exist, and because of that, I sent in the plot ninjas so they could provide an obstacle to Phoenix and Franziska getting home. And that obstacle is a Wipeout competition. And Roy, Riza, Franziska, and Phoenix are all playing against Redd White of all people. At one point, Franziska is a pyromaniac. Oh, and at one point, Franziska is yelling at and whipping a flashlight...

I'll stop there...

I've seen some videos that are a crossover of Ace Attorney with My Little Pony... which would go into the "Don't Work" category. I don't know why they think that would work... I mean, I know AA is silly and not very realistic, but it at least tries to be serious at times. It's like that Meet The Spartans movie, a crossover of 300 and Meet the Parents.
They have nothing to do with each other.

C-A

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I honestly can't think of very many cross overs that would work with AA because of it's unique world and lore. If you really wanted to, you could try to connect some Law Dramas to it, but because of the tone differences they would all have to be a thing where the Law Drama stuff happens in the past, before the laws and trials are changed, and then AA picks up after that.

For instance:

Miami Vice VS Ace Attorney - Crockett and Tubbs investigate a drug smuggling ring and are almost able to trace it back to a young entrepreneur named Ernest Amano. At the last second, though, evidence - possibly faked - is found which clears him of suspicion, stopping the investigation before it can get started. 40 years later, Chief Prosecutor Miles Edgeworth and Detective Ema Skye become involved in re-opening the case when Amano - in prison for being involved in another smuggling ring - is mysteriously killed in his jail cell.

I can think of one that wouldn't though:

Seinfeld VS Ace Attorney: Join Phoenix Wright as he defends George Costanza - Also known as Ace Latex Salesman Art Vandelay - when he is charged with stealing training equipment from his job working for the New York Yankees. Meanwhile, Jerry and Elaine are scared to death when Maya channels Jerry's vengeful relative Manya and Kramer and Oldbag start up a crazy new business together. It's a pizza place where you make your own pie!

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Ace Attorney takes place in Los Angeles, not Miami, though (at least, the localised version does).

A crossover with Law and Order: LA would make far more sense.

Well, most of the show did take place in Miami, but there were many times that they solved cases in other cities. Also, Amano could have been in Miami in the 80's and then moved to L.A. later.

I would have done Law and Order LA, since that was the only Law and Order other than the original that I watched regularly, but that series took place in 2010 and 2011, which is after the legal system was "changed" in Ace Attorney lore. So none of the law and order shows match up with the way trials are handled in AA. In order for it to work perfectly you'd need to find a show that ended/took place before the mid 90's, (the earliest case that showed the AA trial system was DL-6 I believe which took place in 2001).

I would have done Magnum, P.I. VS Ace Attorney (Magnum is one of my favorites) but I couldn't think of a real way how a case Magnum was involved in would affect anyone in AA lore. It would have to revolve an old magnum himself, but by the time of Dual Destinies Magnum would be 83, which doesn't give him a lot of room for doing anything other than testifying, unless he was in really good shape.

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Ace Attorney and Law&Order? Can't see it happening. Besides the fact that both have law as main theme, there's nothing in common between the two. While Law&Order is an actual realistic portrayal of the law world (defense attorneys care about $$$, detectives do their work properly, prosecutors think before pressing charges and judges hold authority) you could say that AA is a complete distortion of it. It would be at least very hard to bring the two worlds together in a coherent manner.

~

I'm the only one who don't care about crossovers? Honestly...

Yeah that's exactly why I didn't pick it.

And no, I don't really care about crossovers much, either. I've heard for PLvsAA is good but I'm just not as excited for it as I was for DD. Also, besides Layton there are no other real candidates for a crossover. I would much rather them focus on continuing the story after GS5 rather than make another crossover. So my ideas about crossovers were not really serious, even the Miami Vice one.

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I don't care much for crossovers, either. I mean, there are only a handful that would really, really work. And even then, it would take a lot of work to not make any of the crossing characters seem bland or one-dimensional. Ditto on not making anyone act out of character.

C-A

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Turnabout Storm's good, though. I didn't like the voice actors at first but there's a lot of things they put in their to make sure Ace Attorney fans won't drown in the world of MLP. The story's silly, but it's pretty decent compared to the other crossover you'd find on Youtube.

Don't ask me why, but I think an AA Vs. Sonic the Hedgehog could work. Maybe Eggman could finally be in trial, and Nick is given the almost impossible task of defending him. However, after a lengthy court battle, it turns out that it wasn't Eggman, but his counterpart, Eggman Nega. Sonic, Tails and the others could all testify and be proven wrong, which would finally give Eggman a chance to be the good guy.