WWE's Mankind is a sadistic lunatic in the ring; his early WWF career saw him cast as a dangerous lackey to both faces and heels. On the other hand, his allies found him to be an Extreme Doormat who constantly yearned for affection and praise.
By the skewed standards of ECW, this happened during Cactus Jack's Face-Heel Turn... "Heel" in this case meaning becoming increasingly vocal about the (genuine) concern he had about the (genuine) danger his fellow performers were putting themselves through to appeal to an ever more bloodthirsty crowd. Until he joined up with the more solidly Heel Raven's Nest stable, the worst Cactus would do was to praise WWF and WCW... which naturally got immense heat from the ECW audience.
Waylon Mercy was the perfect example of this. He was friendly to the fans, refs, and even his opponents before and after the matches. He did promos about going to picnics and enjoying summer days. And then he would destroy his opponent in merciless fashion when the match started.
Nick Bockwinkle made a long career of being a polite, well spoken, intelligent, reasonable man who was more than willing to cheat or drop you straight on your head.