#4 Amazing attention to detail
The Fiend's debut match at SummerSlam wasn't memorable merely because he showed up for his bout with Finn Balor. One thing that made it so intriguing was the attention to detail around just his entrance. While the lights still went out and the fireflies still lit up the audience like before, he also debuted a new theme song.
It fit with his new persona of a man dealing with his past failings and the post-traumatic stress issues that came with it. The remixed version of his theme used the terms "hurt" and "heal" at various points as the vocalist screamed them. The new song added to Wyatt's aura as he moved slowly towards the ring.
And building upon the entrance was the new lantern with which he usually goes to the ring. Instead of being a run-of-the-mill normal lantern, his new one had his old face (obviously a mask) draped over it. Hollywood special effects master and actor Tom Savini was hugely instrumental in helping Wyatt bring his new persona to life.
During episodes of Firefly Funhouse, he has many characters and lessons related to his past character. It's these details, like the Undertaker's urn or Mankind's ripped out hair, that truly make the gimmick something that stands out from all the rest. You can read about five cool easter eggs you might have missed from The Fiend's entrance at SummerSlam here.