Hugue is the only survivor of a noble family which was exterminated in a single night by Methuselah. His quest since then has been to find the ones responsible, find out why his family was targeted, and take revenge. This may be his private reason for joining AX. It is a frequent worry to Catherina and the other members that Hugue is prone to letting his personal grudge take precedence over a mission's objective; Wordsworth openly mistrusts him because of this.