Mr. Rex is Tina's Dad.
Mr. Rex is, like his daughter, a tyrannosaurus rex. However, while Tina is shown to be taller than almost all students at Elmore Junior High, Mr. Rex is shown to be taller than most people in the city of Elmore, towering above Gumball, Nicole, and even his own daughter.
Size comparison. Like Tina, he has thick, brownish-green scales all over his body and huge, black claws on his feet and presumably his hands as well. He has an enormous mouth filled with rows of razor-sharp teeth, and piercing, red and yellow eyes.
Mr. Rex is extremely fierce and protective of his daughter and his home. Unlike his daughter, he is shown to be very animalistic and brutal, preferring to settle disputes by fighting instead of talking.
- "The Quest": He is seen at the end of the episode, coming into frame and roaring loudly just as Tina mentions that he eats trespassers.
- "The Fight": He is seen at the junkyard when Nicole decides to come have a "talk" with him, which resulted in a fight, in which he received a massive, humbling beatdown, enough to break his house.
- "The Rex"
- Like Hector, it is impossible to see Mr. Rex in the normal view of the camera since he is so enormously tall.
- If one listens very carefully to his roars, a small portion is taken directly from the movie monster Godzilla.