Splinter (2012)

Hamato Yoshi (also frequently referred to as his alias Splinter or Master Splinter) was a mutant rat, ninjitsu sensei and one of the main protagonists of the 2012 TV series, known for being both the adoptive father and sensei of all four of the Turtles, the long-lost birth father of Karai/Miwa, husband of Tang shen as well as the adoptive brother and sworn enemy of The Shredder (born Oroku Saki).

Hamato Yoshi is the son and heir of Hamato Yūta, the leader of the Hamato Clan whose rivalry with the Foot Clan came to an end when he was a child. During a confrontation with the Kraang, Hamato Yoshi was mutated into a mutant anthropomorphic sewer rat upon coming into contact with a sewer rat prior to the conflict. Since then ever since alluding the Kraang, he trained the Turtles in ninjutsu. During the Triceraton invasion, he is killed by Shredder but this attempt is foiled when the turtles travel back in time to save Earth. In the second-to-last episode of Season 4, "Requiem" he is again murdered by Super Shredder and buried at the O'Neil farmhouse. His spirit continues to watch over his family from the skies of heaven, imparting wisdom and advice to Leonardo, who reluctantly takes on the more challenging father-like role as sensei on his behalf.