Richard Tyrannosaurton

"Ah! That's the leader of the Animal Mechanicals. His name is Rex. I knew that this guy is leading the Animal Mechanicals the way... although he's just being bossed around by Miles Callisto."

--Su Ji-Hoon, A New Mechanical Destiny

Rex is a green tyrannosaurus rex and one of the five Animal Mechanicals. His ability is strength.

In When the Cold Breeze Blows Away, he is part of the Future Alliance, because the Animal Mechanicals are all futuristic animal robots. Despite being an official leader of that team, he is bossed around by his Supreme Leader, Miles Callisto.

However, it was also revealed that he had a mother named Rosie Rex, had a nephew named Rosalina Rex, and a niece named Rudolf Rex, and he had a brother of his own, who is also the uncle of two named Alexander Tyrannosaurton