#2 Triple H
This might come as a surprise to many, but 'The Game' Triple H wrestled in WCW before he came into the WWE. In 1994, he signed a one-year contract with the promotion. Initially, he was referred to as Terra Ryzing, but was later renamed Jean-Paul Lévesque, a French aristocrat. He had a brief feud with Alex Wright, which ended with Wright pinning him at Starrcade.
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Later, Triple H was put into a tag team alongside William Regal, who also donned a gimmick similar to The Game's. The association didn't go anywhere as Triple H requested WCW to be pushed as a singles star, which was denied. He eventually left for WWE and became one of the biggest superstars in professional wrestling history. Triple H is currently the Executive Vice President of WWE and is all set to take the helm from Vince McMahon in the near future.
Triple H also takes a fair share of credit for making Monday Night wars what it was. As a member of the coveted anti-authority faction DX, Triple H, Shawn Michaels, Chyna and other superstars invaded the WCW arenas declaring war on the rival brand.
DX was given complete creative freedom and they put it to good use week after week, putting RAW in the driver's seat.