IMO I think a full animal mascot looks Fake Sugar Dick (WARNING, NOT THE REAL SUGAR DICK!), see the Nittany Lion above and see this next example:
Doesn't look like it belongs at a college sporting event. Looks like some sick bastard wandered away from a Plushie gathering or whatever the hell those freaks are called. Willie is awesome, because let's face it, a man-beast hybrid is the way to go. It seems way more believable to see Willie running around, dunking basketballs, waving towels, etc because he has the human arms and legs to do it. Maybe creating a man-beast hybrid can be a side project for the NBAF or something.