Tina Rex is a major character in The Amazing World of Gumball.
She is a school bully at Elmore Junior High. She is a large tyrannosaur who often torments Gumball and Darwin. She lives in the city dump and sleeps on top of a garbage pile. She has also never owned a toy before. She appeared in The Third in a cameo, but her first speaking role was in The Dress when she asked Gumball (while he was in a dress) "who are you?".
She was voiced by Dan Russell in Season 1 and Stefan Ashton Frank in Season 2 and onwards.