He's basically a dinosaur heart in a giant robot body. He can understand and hold a conversation, though he only roars and cannot actually speak. (Torin has echoed back the ability to understand dinosaurs.) He has no real canon personality to speak of; there's appropriate roaring and responding where needed, as well as plot-relevant crying. He's got more soul than a Gundam would, but he is nowhere near as much of a personality as C3P-0 would be.