In the wild, the hippo is a dangerous animal, some say it is the most dangerous animal in all of Africa. But the tamed version that we see in games and stuffed toys makes the hippopotamus image cheering and lovable.
The name, hippopotamus, is Greek for "river horse". I'm sorry, but horses are much better looking that this creature! Perhaps its ugliness is one of the reasons that the hippo is a much loved toy and cartoon character.