All 6 original members
The gang are the main protagonists of the series. all 6 members appear in all 8 seasons of the show. (NOTE: topher grace and ashton kutcher only appear as guests in season 8)
CORE MEMBERS:
Eric Forman - (seasons 1-7,cameo season 8)
Donna Pinciotti - (seasons 1-8)
Steven Hyde - (seasons 1-8)
Michael Kelso - (seasons 1-7,guest star season 8)
Jackie Burkhart - (seasons 1-8)
Fez - (seasons 1-8)
SUPPORTING MEMBERS
Laurie Forman - (seasons 2-3)
Randy Pearson - (season 8)
Leo Chingkwake - (seasons 2-4,7-8)
GUEST MEMBERS
Mitch - (season 6)
Charlie - (season 7, flashback season 8)
Roy Keene - (seasons 5-6)
Andrew Davis - (season 8, finale part 1)
Brooke - (season 6, guest season 7)
[TRIVIA]
- Each member of the gang has a different personality and to one and other. eric - nerd, donna - tomboy, hyde - tough guy, kelso - dumb, jackie - spoilt brat, fez - femaninly man.
- The gang is very similar to the gang of the sitcom friends if you compare personalitys.