In Black and White and its expansion pack, I only like a few animal creatures I can choose from. My all-time favorite has been the zebra, but I also like the horse, the chicken, the rhino, and the crocodile. I don't care much for the monkeys or the bears, yet I find the cats, the wolf, and the other farm animals alright. In the games, I strive to one of the good gods, and have my creature (my zebra) be good, too.
Next, I like to brag a little bit about my creature if you don't mind. My zebra, Spirit, is to me one of the best creatures (aside from the horse since both creatures are alike with the exception of color and body shape) of them all. He loves to help me out by giving my people food/wood, water the trees, heal my people when they need it, and in Creature Isle, he randomly builds houses for them when I'm not watching. He's a real angel, which is the reason why I named him Spirit. In battles, he's pretty fast in evasion and attacking his foes, so I mostly depend on that while he's battling. He only knows how to heal himself and how to weaken his opponents, but it doesn't really matter much.
When I first started playing Black and White a few years back, my first creature was the tiger.