Donatello is the absolute genius of the group. He's easily irritated. He's 16 years old and his signature color is purple. Donnie is a turtle mutant, and, like the rest of his brothers, Leo, Raph and Mikey, is bald. He has a shell on his back. He fights with a bō-staff. He is the tallest of the group, at 6'2. Donnie is really sassy and can be mean, even. His other best friend (enemy?) is Casey Jones. The two of them are humans. The turtles fought against Shredder, the Kraang and the Foot Clan.