The Pyro is one of, if not the most divisive class of the Team Fortress' series. He has also gone through some drastic design changes throughout his various incarnations in the series, with almost every appearance differing from the last.
Version 1: QuakeWorld Team Fortress
Version 2: Team Fortress Classic
Version 3: QuakeWorld Team Fortress
Version 3.5: Team Fortress Classic HD Model
Version 4: Team Fortress 2: Brotherhood of Arms
Version 5: Invasion
Version 6: Team Fortress 2 Concept Phase
Version 7: Team Fortress 2 Beta: Trailers 1 & 2
Version 7.5, cont'd: Team Fortress 2 Beta: Illustrative Rendering Phase
Version 8: Retail Team Fortress 2
