But I think keeping him as a manager type role will be pretty good! I think if he goes WWE need a new dark character and the Undertaker could help this... So I was thinking of having the Undertaker have an aprenetice that he could say he has been training showing him the way of the dark side perhaps?
What about a big strong Undertaker-esque character who wears a mask and a disguise? I like the idea of masked characters like early Kane and even the Suicide character from TNA (for different reasons) but mainly because of the feuds that they can inspire. I loved the moment when Kane put a mask on The Undertaker and then Paul Bearer thought The Undertaker was being taken away in an ambulance.
Like the Suicide character, the masked Undertaker-apprentice could have good points because it could use the internet. The internet fans could be debating who it is under the mask and have a good idea. You could have wrestlers calling out others saying they were him, like Daniels/Suicide. Or a group could beat down the character only to have him come out and reveal himself as The Undertaker himself and choke-slam everyone in the ring. I think with Undertaker involved this type of character certainly could work.