Also known as: ゼロス
The self-claimed "Mysterious Priest" who first appears in Slayers NEXT as a sort of shadowing companion of Lina and her gang. He is later revealed to be a high-ranking Mazoku serving the Beast Lord Zelas Metallium. Xelloss is notorious for acting friendly and unfriendly at the same time, as well as being vague with his intentions (he isn't necessarily a liar - he just doesn't fully explain what he's up to). This irritates many people, especially Filia Ul Copt.