Like Winry_Rockbell said, an Illusionist and Rogue type would be nice to see as a class ingame.
Only, I think that assassin will fulfill both roles, since there was a schedule with possible classes which mentioned that assassins will be using Dark Arts. I can only think about moves like invisible, shadowstep, basically skills that make your moves almost unnoticable. Also dark arts sounds like something that will use genjutsu (illusions--> mirages of oneself and etc., but not being trapped in illusions that would turn in something naruto-ish).
Edit: just noticed Winry said illusionist or Rogue type... -.-