Gulstaff_the_Great is a mock character in VG cats, symbolising item-thieving n00bs (newbies; beginners who don't have a clue) and the general morons you encounter playing online games. (Gunbound, Phantasy Star, Everquest, NwN etc.)
Often seen as a level 1 character with a level 50 item. Will hang around experienced players and wait for them to get killed so he can steal their equipment. In PvP games, he will often randomly attack people as soon as he begins and die very quickly.
"Aha!I, Gulstaff_the_Great, have taken your item!"