#2 Never turned heel: Rey Mysterio
Talking about pure babyfaces, how can one not mention Rey Mysterio? He is as big an underdog as one can be, and has always been loved by the crowd for his athleticism and innovative ring gear.
Mysterio made his WWE debut in 2002 and has never been a heel. His biggest moment came when he defeated Kurt Angle and Randy Orton to win the world title at WrestleMania 22.
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Looking back now, it seems that not turning him has been a wise decision, as it would be incredibly hard for WWE to make the fans hate him. Perhaps the only known occasion the fans booed Rey was when he came on at #30 in the 2014 Royal Rumble instead of Daniel Bryan.
The Master of the 619 has reveled in the WWE universe's adulation over the years and has taken on the Goliaths of the world in many successful bouts.
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#1 Never turned face: Wade Barrett
Wade Barrett turned WWE completely upside down in 2010 when he invaded the flagship show, RAW, along with his NXT lackeys, destroying everything in their path. Barrett was the top heel in WWE for the next few months and feuded with John Cena for a while.
His star soon fizzled out though, and he spent the next several years in the mid-card segment. Barrett later became Bad News Barrett, who also had a short stint with The League of Nations but was never portrayed as a babyface.
Barrett brought with him the world-renowned British arrogance that allowed him to criticize the WWE universe week in week out. He was good on the mic and a natural heel, which is why the WWE creative allowed him to go with the flow.