Well, a plotline might involve Mikey being abused by a human who discovers his mutant identity and tries to keep him captive and mistreat him. Mikey would have to use his wits and ninja skills to escape. Or perhaps in a more emotional sense, Mikey is abused by the public's negative perception of mutants. This causes him to question his place in the world and his relationship with his brothers. He might start to withdraw, and the other turtles would have to help him regain his confidence.
One common plotline could be his brothers' reactions. They might go into overprotective mode. For example, Donnie would immediately start working on medical treatments while Raph gets super angry and wants to find out who or what caused the injury. Leo, on the other hand, would try to keep everyone calm and focused on getting Mikey better.
In a fanfiction, Mikey might get hurt while trying to protect his brothers. For example, if the Kraang were attacking and his brothers were in danger, Mikey could jump in front of a powerful blast meant for them. This would leave him seriously injured, with his brothers then having to take care of him and find a way to heal him.
One possible plotline could be that Raph accidentally hurts Mikey during a training session. Maybe Raph gets too carried away with his strength and lands a harder blow than intended on Mikey. This could lead to a rift between them as Mikey feels betrayed and Raph feels extremely guilty. Another could be that Raph is under the influence of some sort of mind - controlling substance or enemy spell and he unknowingly attacks Mikey. In this case, the rest of the turtles would have to find a way to break the control and heal the relationship between Raph and Mikey.
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.
A great 'TMNT Mikey hurt' fanfiction is 'Mikey's Painful Encounter'. In this story, Mikey is hurt by a mutagen - related accident. His brothers are desperate to find a cure, and the fic does a good job of showing their emotional turmoil. There are also some really interesting side characters in this fanfic that add depth to the story. Additionally, 'Hurt Mikey, Stronger Spirit' is a fanfic where Mikey endures a physical injury but his spirit remains unbroken, and it's inspiring to read how he overcomes his pain.
One common plot element could be the other turtles rallying around Mikey. They might try to find a cure or take care of him. For example, Donnie could use his scientific knowledge to diagnose Mikey. Another element could be Mikey's own struggle with being sick. He might feel weak and frustrated that he can't do his normal activities. Also, there could be a threat that takes advantage of Mikey's weakened state, like an enemy planning an attack while he's down.
It could also be due to some sort of accident in the lair. Maybe there was an experiment gone wrong by Donnie. Mikey is curious by nature and might have been poking around where he shouldn't have, getting caught in an explosion or a malfunctioning device.
He might gain new physical abilities, like enhanced strength or speed.
One possible plotline could be that Zane is being verbally abused by a rival duelist who constantly taunts him about his past losses. This might lead to Zane having self - doubt and struggling in his duels.
In the traditional TMNT universe, male turtles like Leo getting pregnant goes against the biological norms of the franchise. However, in fanfiction, anything can be reimagined. Some fanfiction might use magic or some out - of - the - box concepts to make such a situation possible, but it's not part of the official TMNT lore.