The Corporation; a stable comprised of hand-picked wrestlers representing Mr. McMahon, their goal was to secure the WWF and "crush the rebels" who did not fit with McMahon's vision of a legitimate business. Includes the following:
Shawn Michaels; unfortunately, due to his career-stopping back injury, Shawn would only appear sporadically during the "official" Attitude Era timeline, and never in a wrestling capacity.
D-Generation X (or "DX"); known for their raunchy antics (such as playing strip poker in the ring and throwing a barbeque while nearly in the nude), DX paved the way for the Attitude Era. Its members include:
Stephanie McMahon, Vince's Real Life daughter, who kayfabed married Triple H to seize control of the company from her father, forming the "McMahon-Helmsley Faction/Regime", dominating most of the late era.
The Hardy Boyz (Matt Hardy and Jeff Hardy), The Dudley Boyz (Bubba Ray and D-Von), and Edge & Christian, who feuded with each other on and off for the last couple of years of the Attitude Era and raised the bar for tag team matches of all kinds in the company, including the first "Tables, Ladders & Chairs" match.
Val Venis, an ex-porn star who was already one of the WWE's most sexually suggestive superstars, then he slept with someone's wife/girlfriend/sister/valet etc., usually leading to him getting his ass kicked for his troubles.
Scotty 2 Hotty and Grand Masta Sexay, better known as Too Cool; the tag team won fans over with their post-match dancing antics. They would eventually be joined by...
Rikishi, one of the many members of the famous Anoa'iWrestling Family. His signature move was the "Stinkface", where an opponent is downed at the turnbuckle of the ring, leading to the "Phat Man" smothering his enormous ass in their face.
Right to Censor, a late-Attitude Era stable led by ECW alumnus Stevie Richards that was opposed to the "smut" in the WWF. They were a blatant mockery of the "Parents Television Council", which was leading opposition to the WWF's risque direction. The WWF did eventually go in a Lighter and Softer direction, although that was due more to Linda McMahon's failed political campaigns, the terrible fallout from the Benoit tragedy, and the rise of John Cena.
Trish Stratus, who started her career in the midst of the Attitude Era as a standard valet for the midcard tag team "T&A" (Test and Albert) before breaking out as a major wrestler. To date, she still holds the most Women's Championship reigns in the company's history.
Lita, a Girl Next Door valet, whose lucha libre and high flying skills as well as showing that Muscles Are Meaningless when it comes to taking on men (as bodybuilder Chyna, who at the time was stronger than Triple H, did before), helped take women's wrestling to the next level. Together with The Hardy Boyz, they formed "Team Extreme".
Wrestlers who would fight for the WWF Hardcore Championship (where title matches were "Extreme" rules and required to be defended 24/7). Along with Mankind, the first Hardcore Champion, and the Big Boss Man, there was also:
The Holly Cousins, Crash Holly and Bob "Hardcore" Holly, "Super Heavyweights" and a part-time tag team, who fought each other as much as they fought opponents. Crash, who won the most championships in the era, would be dubbed the "Houdini of Hardcore" for his quick getaways upon winning or retaining the title.
Steve Blackman, a legitimate martial artist nicknamed "The Lethal Weapon".