Relationships
In the novels, the Slayers group generally abhors his presence, while in the anime he is treated as a tolerable nuisance.
In the anime, Xellos and Lina seem to have mutual respect for each other. He seems to enjoy the chaos that follows Lina and follows her for the sake of fun even when he is not ordered to do so. Lina also has comically beaten him when he gets them into trouble. In the novels, Xellos is more distant around her, somewhat troubled by the fact that Lina, unlike other humans he has dealt with, is able to see the bigger picture and is not easily manipulated.
Zelgadis holds a powerful hatred towards the Mazoku because in the 2nd episode of NEXT, Xellos destroys a Claire Bible manuscript, which the chimera thought might have contained the cure to his state. This does not bother Xellos, even though he is the only one who does not tease Zelgadis about his appearance.
When Amelia makes one of her heroic speeches, Xellos often listens with amusement and mild curiosity, although they disturb him at times. When she expounds at length about how beautiful and wondrous the world and life are, Xellos becomes extremely weakened, even cringing at her minor comments. So great is the effect of these speeches on Xellos that, when they are forced to fight him, the group uses one of them as a weapon to render him helpless.
Filia is the only being capable of annoying and angering Xellos. Even though he tries to be polite to her, she continues to insult him and call him names like raw garbage (namagomi). Xellos likes to tease Filia because she is part of the dragon race. Her hatred towards him originates from the fact that he killed many dragons during the Kõma War (War of the Monsters' Fall) 1000 years in the Slayers universe's past. By the end of the series, they learn to tolerate each other and are capable of having at least one conversation.
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