Dinosaur is a small Tyrannosaurus Rex, slightly larger in size than the average human player. Because of his size and unique appearance, he is fairly easy to spot. He has an odd balloon-like look and stands erect in a not-so-dinosaur-like manner, and seems to move almost more like a man in a dinosaur suit, which may explain why his mouth is always open.
His dance seems almost perfectly in time to the Future Perfect title screen music.
His native timezone is suggested to be 1920 as the challenge Aztec the Dinosaur Hunter confirms their existence in that timeline and his thumbnail theme is the same shade of brown that belongs to the Aztec theme.
It can be assumed that Dinosaur is the character from the oldest time zone.
In TimeSplitters 2, when using the dinosaur's fists, they will not appear on-screen.