[The fandom has infected my brain, so I decided to turn it into a rp book(also because I don't see a lot of ROTTMNT rp books on here and mostly see x reader fanfics instead).] + [Cover is not made by me]
(No ships with Casey since he's from the future and all the characters we see in the show are adults in his timeline so it would be funky.) + (credit of artist is in black writing and in the middle right.)
First seen as a mutant:
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More used to being a mutant(kinda):
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[Since we don't know what happened to Casey after the events take place, I decided that Casey would stay in the timeline that has it where the Kraang was defeated, aka our universe. Since he's staying in that universe, Case Jones Jr ends up being mutated and gets turned into a turtle, and according to the art piece, he turns into the same type of turtle as Leo.]