Who are you

It wouldn't be surprising if Leo got some unneeded criticism from his older brother, Raph, after Leo suddenly became the leader of him and his brothers. Mikey was always the one who tried to make things better, but he noticed things between them all have changed. Donnie is more obsessed with his lair and invention. Raph likes to cause fights with Leo at times and everything is just chaos. Mikey decides that after he's done with a single fight, he goes off to try and gain some peace, but he runs into someone.
Big Mama's so-called assistant was discarded after Big Mama gained "Shadow Fiend", so the assistant ran off in fear of being killed. But the odd thing is that there is more to the mutant than meets the eye. For one, she's a mutant turtle hybrid and is living on the streets of the surface. So what happens when her usual stealing is stopped by Mikey?

A friend of mine made the silhouettes of the turtles but I made the cover with Canva. ROTTMNT belongs to Nickelodeon, as does the assistant. But the theory belongs to neither me or Nickelodeon. I own the plot.