#5 Sting: 2008 - 2009, 2010
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TNA Wrestling tried to turn Sting, one of the most popular wrestlers of all time and the most popular in WCW history, heel, not once but twice.
The four-time winner of the PWI Award for Most Popular Superstar of The Year had an on and off run with TNA for about seven years and remained incredibly popular for the entire run. This wasn't going to stop TNA though, as they first attempted to turn him heel in 2008. Sting began an angle with babyface TNA World Champion Samoa Joe, over the young guys of the company not having respect for the older.
This would turn into a faction vs faction feud with Sting joining up with Kurt Angle, Booker T, Kevin Nash and Scott Steiner to form the Main Event Mafia, while Joe and AJ Styles formed the TNA Frontline faction. Kurt, Booker, Nash and Steiner would all be their same heelish selves during this time, but Sting wasn't.
Although feuding with top stars, and unlike his partners, he never once spoke out against the fans and continued to show them respect during promos and greeting them with handshakes as he made his entrance.
The same thing happened again in 2010. While feuding with then-babyface Hulk Hogan, Sting turned heel and led viscous attacks on popular stars like Rob Van Dam and Jeff Jarrett, and also feuded with the said top faces, yet still respected the fans both in promos and handshakes as he made his entrance, thus resulting in not being booed.