Nicknames are pet names and diminutives used to forego formality in either an affectionate or spiteful way. But were we to list every word or phrase people use in place of a person's name for these reasons, the list would quickly become a mess if not unending. So far, the only true nicknames (because they've stuck) in the show seem to be Roman calling Ruby "Red" and Weiss's Snow Angel/Ice Queen nicknames. Others, like Blondie, Crater Face, and Vomit Boy have not been reused in-show. I think the latter names should be removed from the nickname section of those respective characters' profile pages. Sure, right now, listing them probably doesn't "hurt" anyone. But we likely won't have to wait long for it to become a problem. Someone already wants to add Bimbo as one of Yang's nicknames. Hell, I'm surprised no one listed Street Rat and Master Thief as one of Emerald's nicknames. Or how about Dusty Old Qrow?