#5 Vanquishes legends
Perhaps we could see Bray Wyatt be the Superstar who vanquishes and destroys WWE legends, much like the Randy Orton "Legend Killer" gimmick. Wyatt could demolish and get in the heads of these legends and put them out to pasture.
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While this may be similar to the "Legend Killer" gimmick, WWE could make it feel fresh if done right.
Perhaps his first victim is Kane, who is no longer a full-time member of WWE, and could retire him. Which could lead to Wyatt finding his next victim, which naturally is The Undertaker.
This feud has happened previously, but Wyatt needs a big scalp like The Undertaker to get back in the reckoning, to eventually challenge for the top titles in the WWE.