#2 An Ally/Follower
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Since turning into a children's show host, Bray Wyatt only surrounds himself with his 'fireflies' and claims that The Fiend is there to protect them. It is very clear that The Fiend doesn't need anyone by his side right now, but in the future, introducing a follower could prove to be a good move for the character.
When Bray Wyatt was going to announce a brand new member of the Firefly Fun House, many fans thought it would be Liv Morgan, who will be repackaged as Sister Abigail and join Bray Wyatt.
Apparently that didn't turn out to be true, but the idea certainly makes sense.
It isn't necessary to introduce a character that is related to Wyatt's past; a completely different one could also help to elevate The Fiend. Apart from Liv Morgan, another good option could be Bo Dallas, who is the real-life brother of Bray Wyatt. Bo Dallas currently tags with Curtis Axel as a part of The B-Team, but with the tag team not working out, Dallas could definitely use a change of character.