If people are going to think their Pokemon would affect their roles, I'll just list my thoughts on what everybody could be through their Pokemon. Don't take it as the truth, that'd be stupid.
Blastoise-shellshocker (Blastoise): Blastoise was more defense driven statwise, so he'd be a priest/guard/whatever you call it.
Jason (Mew): Mew's stats are all-around, so maybe a town person.
MadHatter (Hariyama): Offensive statwise, so werewolf.
Absoltrainer (Absol): High offense, wolf. Brings disaster makes me think he's independent from the town.
spoinkmaster (Deoxys- Defense): Defense form says enough, priest/guard/etc.
The Ft. Laud. Loud Mouth (Mismagius): The offense based ghost goes werewolf.
homeofmew (Pikachu): Other than being a really well known Pokemon, no outstanding qualities make him a generic person.
DukeFireBird (Jirachi): Average stats, no special role.
tglilly (Umbreon): Umbreon is defense based. Guard.
PlaF-The Master (Bulbasaur): Average joe.
Mew* (Gengar): Gengar is known for special attack. Offense = wolf.
Waliken (Weavile): Wolf, period. Weavile is awesome at attack with its speed and power.
Shadow Zangoose(Slowbro): Slowbro is a tank, a guard.
z-man (Piplup): Regular person.
BigRed (Ariados): Average overall, so no special role.
lousit200 (Crobat): Crobat looks ****** but evolves from happiness. Independent person of the group I'd guess.
Time For Pain (Honchrow): Honchkrow looks like a mob boss; Werewolf leader.
Sandslash7 (Sandslash): Nothing out of the ordinary for him, an average person.
Chromecatz (Miltank): Tank is in Miltank's name. Defender.
Lakak (Skarmory): Skarmory is THE physical wall, almost has to be a defender.
Lugia 58 (Lugia): See above, Lugia's defenses makes it a pain to knock out.
UmbyKirb (Porygon Z): Attack driven though slightly slow. Maybe werewolf.
stolenmoments (Empoleon): Well rounded makes a plain person.
Matijs (Munchlax): Average person.
LifeVirus7 (Gyarados): Wolf. Gyarados is vicious enough to do it, I'm not denying that.
Again, these are just my thoughts. Besides, there's too many werewolves in this list if it were a real game.