One idea could be that Mikey and Shinigami team up to solve a mystery in the sewers that involves some strange magical creatures. They use Mikey's fun - loving nature and Shinigami's magic skills to figure things out.
A plot could involve Mikey getting into trouble with some bad guys while Shinigami is away on a mission. When she returns, she has to rescue him and in the process, they discover a new power that they can use together. Shinigami could teach Mikey some basic magic to help him in a fight. Mikey, being the quick - learner he is, uses it in a creative way that surprises both of them.
They could develop their relationship through shared adventures. For example, when they go on a quest to find a lost artifact. During the journey, they face many difficulties. Mikey makes Shinigami laugh with his silly jokes in tough situations, and Shinigami protects Mikey when he gets in over his head. This way, their friendship deepens into a more trusting and closer relationship.
In many 'TMNT Mikey hurt' fanfictions, a common plot element is Mikey's own attitude towards his injury. Sometimes he tries to be brave and not show how much pain he's in to not worry his brothers. Another element is the search for a cure or solution. If he's poisoned, they'll look for an antidote. If it's a physical wound, they'll try to find medical supplies or a way to heal it. And there's usually a lot of brotherly bonding as they take care of Mikey.
Well, it's interesting because it takes two beloved characters from the Teenage Mutant Ninja Turtles franchise and explores a different kind of connection. In the original series, their relationship is mainly platonic. But in fanfiction, writers can play with different scenarios. They can put them in situations where they have to rely on each other more, and that can lead to a deeper emotional bond that we don't usually see in the official storylines. Also, the different interpretations of how their relationship could develop add to the allure. Some might write it as a slow - burn romance, while others might have them realize their feelings more suddenly.
In a fanfiction, Mikey might get hurt during a mission to infiltrate a Kraang base. He could be detected by security systems and get zapped by some sort of electric defense mechanism. This would leave him weak and in pain. His brothers would need to carry him out of there and find a way to reverse the effects of the zap. They'd be desperate to get Mikey back to his normal, energetic self.
It could be that they were tricked into thinking they were helping someone. A villain might have convinced them that the 'kidnapped' person was a bad guy who needed to be taken away for interrogation. But as the story unfolds, they realize they've been used and have to find a way to make things right.
One interesting plot could be baby Mikey and Donnie getting lost in the sewers while exploring on their own. They have to use their wits and the little skills they've learned to find their way back to their brothers.
One idea could be that the Turtles from 1987 end up in the 2003 universe and have to adapt to the darker and more serious tone. They could team up with the 2003 Turtles to fight a common enemy like the Shredder. The 1987 Turtles' more light - hearted and comical ways might initially clash with the 2003 Turtles' brooding nature, but they eventually learn from each other.
A possible plot is that an ancient evil that was sealed away in the 2003 universe is accidentally awakened by the arrival of the 2012 turtles. The 2003 turtles initially blame the 2012 ones but then realize they need to work together. They combine their strengths, with the 2012 turtles' modern thinking and the 2003 turtles' deep knowledge of ancient ninja lore, to defeat the evil.
One idea could be that the Turtles from 2003 get transported to the 2012 universe and they have to deal with the different versions of their enemies. For example, the Shredder in the 2012 version might have some new powers or tactics that the 2003 Turtles aren't used to.
One idea could be a crossover where the shinigami from Bleach enter the world of a gamer. For example, Ichigo could find himself in a virtual reality game world, and his shinigami powers would work in unexpected ways. Maybe his zanpakuto would have different abilities in the game, like being able to cut through digital barriers.