These things are not so much a mascot or caricature as a representation of how one sees himself or his team. For example, Amphibious1 probably uses the Predator as an avatar because it's a bad ass warrior. If the tribe(s) vote it down as deragatory I'd respect that, but not necessarily just individuals complaining. Wikipedia's name origin section is interesting, but not definitive.
AFMich, love the Airedale (another term for hard-headed, but lovable bastard).