Appearances in the game
Xavier never appears in the game anywhere else but at the cafe, during the night hours.
(Note that this description is not actually seen in the shop because he never visits your boutique)
Works at the cafe. Impeccable manners.
Taste in clothes
Relationships with other characters
Xavier does not speak to anyone in-game, as he is not seen when he is not working. He displays superb manners towards his customers.
In the American version of New Style Boutique, his shop description is slightly different. It mentions learning his manners from his father.