Mario: Is still in Boo mode, but this time it's on purpose. ^^
Trowa: The Phantom of the Opera.
Were!Sonic: Has dyed is fur green and claims he's in costume as the Incredible Hulk. Just go along with it.
Hughes: The (Burger) King. He will be saying nothing for the entirety of Halloween.
Hiei: ... Himself, really. Only four people outside the family have seen his Jagan...
Samus: Iron Man (Sh'ell be too busy trying to arrest/kill Jack Sparrow and anyone else dressed as a pirate to really be part of the fun. ^^)
Ranma: If he can get his Neko!self under control, (s)he'll be dressed as Dr. Frank N. Furter from the Rocky Horror Picture Show.
James: Seymour from Little Shop of Horrors, accompanied by his Victreebell as Audrey II.
Noir: Is not going out tonight.