Sorry to chain but i was thinking about Luc's toon and though i have not yet tried this I was thinking of making a Elementalist Mesmer or Elementalist Necro
I was thinking either Ice spells for the abilities to mess with other players and then some hexes and mana steal, that or you could go with earth spells to buff yourself and your team and hex the enemies...
If you went Earth Necro you could cast the gravity spell (the one that pulls all the enemies together and then the necro curses plus disease so they all get the curses...just an idea