Splinter

Splinter, often referred to as Master Splinter or Sensei by his students/sons, is a fictional character from the Teenage Mutant Ninja Turtles comics and all related media. A mutant rat, he is the grave and stoic sage of the Turtles, their ninjutsu and martial arts instructor, and their adoptive father. Originally depicted as the pet rat of martial artist Hamato Yoshi (Japanese: 濱戸義), in later works he is sometimes portrayed as Yoshi himself, mutated or reincarnated. The character was originally a parody of the Marvel Comics character Stick. Mirage Comics, original films, 2003 cartoon, 2023 film In both the original comics and the live-action movies, Splinter is the pet rat of a ninja named Hamato Yoshi in Japan. Intelligent for his species, Splinter is able to learn ninjutsu art by mimicking his master's movements while he practices. Yoshi becomes embroiled in a dispute with a fellow ninja by the name of Oroku Nagi and is eventually murdered by Nagi's brother, Oroku Saki, who is seeking revenge for his brother's death. However, in the 1990 film and 2003 TV series Nagi is removed entirely. Additionally, in the 1990 film, Splinter escapes from his cage during the murder, and attacks Saki, clawing at his face. Saki, in turn, slices his ear off. It is suggested that this mutilation is the reason Saki took the Shredder disguise to hide the scars. In contrast, in the 2003 TMNT cartoon series, it was Hun's face which Splinter clawed. Without a home, Splinter is forced to run away and live in New York City's sewers. Due to a traffic accident, four baby turtles and a canister of mutagenic ooze are sent down into the sewer. The canister mutates both Splinter and the turtles; it also enhances the former's already sophisticated intellect. Splinter names the four turtles Leonardo, Donatello, Raphael, and Michelangelo (after a book on Renaissance artists that he found in a storm drain) and trains them in the arts of ninjutsu so that they can avenge his dead master while raising them as his own sons, as well as educating them. In the 2003 TMNT cartoon, he possesses a significant reputation as a ninja master; in a multi-part episode, he is revealed to be a champion of the Battle Nexus, a multi-dimension-spanning contest where the greatest combatants of various dimensions come together to fight each other for the title of Battle Nexus Champion.