hi leigh! i'd love to scene with you. out of your characters i imagine warren would get along best with boom-boom, maybe flux too. he might have an interesting relationship with jean too -- if she is buddies with tony, she would have to more or less know warren and vice versa. they could be friendly or a little antagonistic. (maybe warren's jealous of jean & tony's friendship?)
oh, one other thing, warren is always available for crushing on/dating/whatever. and really, wouldn't a little sister with a crush on angel be extremely annoying to an older brother?