The Druid

A character from WWE SmackDown vs. Raw 2011 career mode.

The Mystery
A character shrouded in mystery. His first appearance in TFR has been in the non-canon Christmas Bonus Stream of Season 4.

Off-Season 7: Vergil OVA
Mysterious beings related to The Undertaker. In the bad ending where taker wins, they surround Vergil and carry him away into the Underworld.

Trivia

 * It is also theorised he might be a previous identity of the equally mysterious Third Eye Man