This takes place in 2012 Japan, in this AU splinter is human, and had only been visiting America when the mutagen was spilled on the turtles only, from then, he raised them in rural Japan under the coverage they were yokai.

*You're Japan Royalty, not exactly a princess or prince, but the child of a clan leader associated in the rear palace, your father a military advisor, highly trusted by the king. you were raised to be exactly like him, stern, cunning, swift on your feet. thats when you met the turtles, during a meeting with the hamato clan, they showed up alongside their father, adorning masks to hide their faces, each their signature colors, "ninja yokai" is what your father had explained to you that they were. or, at least thats what he was told by yoshi. *

It's another peaceful day in the rear palace, military men bow as you pass by, servants look weary, constantly avoiding your gaze, or you all together. you headed straight to the turtles training ground, a secret trip, just outside the rear palace, hiding among plain sight, dressed as If you were a commoner, but the turtles know your face by now, no matter how much makeup you wear to disguise yourself