Ashes to Ashes! Dust to Dust!(Helluva Boss x TMNT 2012)

In this AU Mikey was sent to hell by the Kraang after his mutation but never died.

He was found by two imp demons, Millie and Moxxie, and they took the box turtle mutant in. Of course the couple didn't know he was a mutant and thought he was a demon like them.

Over time Mikey's appearance changed. His green skin became red. His white scaleras became yellow, his blue eyes became red(mainly black), he also gained black hair and horns like Moxxie's horns.

He wears the same kind of clothes as Mille. He acts mainly like he does in tmnt 2012 and 2018. Moxxie was VERY against Mikey joining I.M.P but Mikey joined I.M.P anyway. Like Moxxie and Millie, Mikey is exceptionally good at using both axes and guns. He learned how to use nunchucks on his own but is pretty good at it.

I.M.P goes against Verosika in season 1 episode 3 and Mikey runs into the turtles.

They see him killing a target and try to stop him from killing anyone else. Of course Mikey is not going to have that and fights back, even breaking Leo's arm.