Characters created for, and exclusive to TMNT. For tropes relating to characters who originally appeared in other incarnations or were created here and went on to appear elsewhere, please visit the franchise character page. Unless otherwise stated, the characters of the sheet are canon foreigners.
- The Atoner: His quest for immortality led to his generals, who were also his family, becoming stone statues and unleashed a batch of horrific monsters on the world.
- Badass Family: With the Stone Generals.
- Big Bad: Subverted. Most of the film sets him up to be this, but his true motivations and plans are eventually revealed to be good. It's subtly implied that he may have been a true villain during the events 3,000 years ago that led to him gaining immortality, but later pulled a HeelFace Turn due to the centuries of living with guilt and regret over the fate of his generals and being responsible for releasing the 13 monsters into the world.
- Disappears into Light: After the Stone Generals are defeated and the curse is lifted.
- Helmets Are Hardly Heroic: In the film's prologue, he is fully dressed in armor as Yaotl. However, while he is wearing his armor again in the present day, Max just puts his helmet aside and doesn't wear it for the final fight. In fact, it's the only thing that doesn't disintegrate with him.
- Julius Beethoven da Vinci: Comes with the territory of being immortal.
- Really 700 Years Old: He is revealed to be Yaotl, cursed with immortality after opening the portal 30 centuries ago.
- Who Wants to Live Forever?: Max Winters, after three thousand years of regret and loneliness, cannot find it in himself to bear the curse of immortality any longer.
The Stone Generals
- Actor Allusion: General Gato has the name and voice actor of one of the first villains of Naruto.
- Badass Family: With Max/Yaotl
- The Brute: General Mono
- The Dark Chick: General Serpiente
- The Dragon: General Aguila is Yaotl's second in command.
- Evil Sounds Deep: General Aguila, courtesy of Kevin Michael Richardson.
- Living Statue: Brought to life by reanimating devices put on their chests.
- The Smurfette Principle: General Serpiente is the only female general.
- The Starscream: They become this to Yaotl when they learn his true motives.
- The Voiceless: General Mono doesn't speak, but grunts and growls. However, he does talk in the video game.
- Who Wants to Live Forever?: Averted, they WANT to live forever and believe Yaotl has become soft and weak.