celebrity look alikes for characters
If these celebrities threw on costumes for their respective look alikes and went to a cosplay convention, I think they'd pull it off nicely.
Cloud: Jeremy Renner
Tifa: Victoria Justice
Aeris: Leelee Sobieski
Cid: Woody Harrelson
Barrett: Laurence Fishburne
Vincent: Jared Leto (couldn't really think of anyone)
Yuffie: Jamie Chung
Sephiroth: Alexander Skarsgard or Vincent Cassel