It could be the Foot Clan. They've always been enemies of the Turtles, and kidnapping Mikey would be a way to get back at them or gain some advantage.
Maybe it's a new villain that we haven't seen before in the TMNT universe. This villain could have a special grudge against Mikey specifically, perhaps because of something Mikey unknowingly did in the past.
It could be Shredder. He's always been after the turtles.
Well, his brothers would probably go on a wild rescue mission. They'd search every nook and cranny of the city. Maybe they'd get some help from April and Casey too.
Maybe a rogue mutant. There are all kinds of mutants in the TMNT universe. One that has a grudge against the Turtles or just wants to use Donatello's skills for their own gain could be the kidnapper.
One possible plot twist could be that Mikey was kidnapped by an unexpected enemy, like a former ally who turned bad. Maybe it was someone he trusted, and this betrayal adds a layer of drama.
In this kind of fanfiction, the creators usually play with the characters' original traits. Karai, with her ninja skills and her own motives, could either be an ally or an adversary to Dark Mikey. For example, they might be forced to team up against a common enemy, and during that process, they start to understand each other better. It's all about exploring the uncharted territories of their personalities and the possible dynamics between them.
One possible scenario could be that Mikey gets hurt during a fight with the Foot Clan. Maybe he underestimated an opponent and got a nasty cut on his arm. His brothers would then rush to his side, with Donnie trying to patch him up as quickly as possible while Leo and Raph stand guard, ready to fend off any further attacks.
One great 'tmnt female Mikey fanfiction' is 'The Girl in Orange'. It really delves into the idea of a female Mikey having unique adventures. Another interesting one could be 'Female Mikey's Hidden Power' which shows her discovering new abilities. There's also 'Mikey: A Girl's Tale' that focuses on her relationships within the TMNT group.
He might gain new physical abilities, like enhanced strength or speed.
The Teenage Mutant Ninja Turtles are mainly a family - friendly franchise. Fanfiction that involves inappropriate or adult - themed relationships like'make love' goes against the general spirit of the series. So, it's not likely to be officially recognized or common.
The abuse could be resolved if Mikey discovers a new power or ability within himself. This newfound strength gives him the confidence to face his abuser and put an end to it. Additionally, the support of other characters in the TMNT universe, like April or Splinter, could play a crucial role. They could offer advice, protection, or just be there for Mikey when he needs it most. Maybe they could even help Mikey expose the abuser to the authorities in the world of the story, if applicable.