#4 Abyss
Judas Mesias was more like a Kane to TNA's Undertaker, The Monster Abyss! The now-TNA veteran's extreme character took off during his initial days with the company in 2005 when he was paired along with manager James Mitchell.
Two solid years later, TNA looked to capitalize on Abyss' popularity by debuting Banderas as his 'brother' Judas and booking the two in a long-drawn feud. It tanked miserably and led to the departure of the Lucha Underground star.
Abyss, though, went on to achieve legendary status in the troubled promotion, winning the TNA World Championship twice while also holding it for 396 days, which is the longest reign in the title's history. WWE officials were forced to take notice of this masked 6'8" inch behemoth making waves in their rival's yard.
As revealed by Abyss himself, WWE approached him with the option of facing Undertaker in his WWE debut match at WrestleMania. The outrageously loyal giant turned down the offer and has been having an identity crisis in TNA ever since.
In case you haven't been watching, Abyss is now the Kane of TNA/Impact Wrestling: