About that concept art of a green-haired spiky boy with the blue scarf; I was wondering if I can use that design for a character I made and modify it to be a character. If I can, I understand if I have to buy it. Please respond ASAP.

yes please send all payments to phoenixwright@aceattorney.gov and we will authorize your use

This probably isn't the right place to ask. I don't think anyone here could authorize a sale like that, but since the design is out there, as long as you're doing it for private use, it's probably alright to use. Unless you're trying to sell it, or your product that's using it, you should be just fine

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