Fan Community Nicknames: Creatures of the Night** Underfaker for the Brian Lee Undertaker in the "Two Undertakers" storyline.
Dye Hard: He is a redhead and performed as one early in his career, but eventually dyed it black and kept it that way ever since. You could see his hair shift a bit back towards red during his BikerTaker days when he had short hair and didn't have to do the Deadman jet-black dye job.
Fountain of Expies: Popularized the Light Flicker Teleport, the Chokeslam, the tombstone, the no sell situp and various supernatural monster gimmicks. Did not start most of them but definitely caused a trend. Also inspired the use of mixed matrial arts equipment, even for wrestlers who have no background in the sport or relating gimmick.
What Could Have Been: The Undertaker's original manager, back when he was "Kane the Undertaker" (get a load of that name)? Brother Love. Now just imagine how the character would have evolved if Brother Love had stayed his manager.
Taker very briefly had a gimmick sort of halfway between his Druid/Ministry gimmick and the American Badass. He had his motorcycle, and an entrance video with three creepy girls saying "his judgment day is now...". Then Limp Bizkit released Rollin', and Taker's gimmick was changed so he could use it as a theme song