#1 Rey Mysterio
Since his debut in 2002, Rey Mysterio has wowed WWE fans around the world with his high-flying lucha libre wrestling style and is considered one of the pioneers of the company's cruiserweight division.
The Master of the 619 has won several titles in the company including the Intercontinental, the United States, Tag Team, Cruiserweight, and WWE World Championships. Mysterio also won the 2006 Royal Rumble and went on to win the World Heavyweight Championship from Kurt Angle at WrestleMania 22.
Before his arrival in WWE, Mysterio wrestled in WCW, primarily in the cruiserweight division. When he eventually joined WWE, because of his smaller stature compared to most of his opponents, he was billed as an underdog in most rivalries. This further endeared him to the fans, who always want the underdog to thrive. In addition to that, his finisher, the 619, is one of the most popular moves in WWE history.
Rey Mysterio is currently engaged in a feud with the Monday Night Messiah Seth Rollins in a rivalry which might result in Rey's son Dominik Mysterio make his debut in WWE. With Mysterio being in the twilight years of his WWE career and trying to get Dominik over with the crowd, it's tough to see him ever turning heel in the company.