Splinter Taught Them To Be Ninja Teens.
I imagine that's not all he taught them though. Probably all sorts of manners, nihongo and stuff. ...and gambling. My splinter would be inspired by Nezumi Kozou. He'd be a reformed thief and gambler. A bit superstitious, he feels the calamity that has befallen him is the karmic payout for his past life. He sees his instruction of these Teenage Turtles as a means to redeem himself.
My splinter is nearly blind from cataracts.>
Splinter- "I'm the only man to have sinned enough to be reincarnated before his deathYou can get the original 19x24cm drawing on Maruman art spiral paper over on my etsy
These characters were made by Eastman and Laird... fuck if I know who owns them now.