BRK can have his gigantic Rhinos (OK, fine, I'm getting one of those, too), but I'll take this beast -- a slavering, rampaging, murdering... baby polar bear as a Hunter pet. Seriously? How does this thing even attack? The graphics, cute as they are, don't really look like they're done -- kind of just seems like a bear with a baby mask on. But sure enough, the pet is called an Arctic Grizzly Cub, and can be found as early as 69 in Dragonblight. This may not stay tameable on the live realms, of course, but if it does, it could be the cutest thing ever to tear apart the Alliance in Eye of the Storm.
Here, have a tasty Coke. Now die!