TMNT BLOOD BROTHERS: Sensei Splinter!

Trained since the age of 6 to be a Yakuza assassin, Hamato Yoshi gave up a life of crime after falling in love for the first time, and decided to isolate himself in the middle of the forest, where he would use his martial arts skills to defend nature and animals from bad people, until one day, he and four newborn turtles that he rescued were abducted by scientists from the planet Utrom and turned into mutants. Yoshi/Splinter is wise and humble, but he is also extremely overprotective of his adopted children, even though they know how to manage very well on their own...