#1 D-Generation X
You cannot talk about the Attitude Era without mentioning the most important group of the time, D Generation X. A notorious group that would take down anyone in their path if they didn't comply with their requirements.
A lot of people suffered their wrath, including the owner of the WWE, Vince McMahon. If you recall the segments Stone Cold Steve Austin had with Vinnie Mac, you would be aware of what segments the latter had with this group.
Check out which wrestler EC3 finds cute RIGHT HERE
From a WCW takeover to mimicking the owners of the company and putting them through hell, this group did it all. While a lot of us remember just HHH or Shawn Michaels from the group, there were other members of the group too that gave their contributions as well, including, X-Pac, Billy Gunn, Road Dogg, and the most important member, Chyna.
She revolutionized the way women were depicted back in the day, while the group revolutionized the word 'Entertainment' in the Attitude Era and the WWE in general.