#2 It's multilayered with the Firefly Funhouse and Fiend personas
Mick Foley initially debuted in the WWE as Mankind. He was a tormented soul who wore a mask that partially covered his face. He would rant and rave and shake back and forth while cutting promos. And if that didn't creep you out enough, he even tore out clumps of his hair.
If that wasn't great enough character work, he also brought Dude Love, a hilarious love machine, and Cactus Jack, a hardcore rebel, to the WWE. Those reasons were huge reasons why Foley became so beloved by the fans.
A top AEW star just called one of his colleagues 'spoiled' and 'narcissistic' HERE.
Wyatt's new character deals with a very real disorder that millions of people worldwide deal with in PTSD or post traumatic stress disorder. Something in a person's life has affected them so much that it alters their every day life. Even normal things like going shopping or hearing fireworks on the Fourth of July become hard to deal with.
The Funhouse has allowed Wyatt to use paint therapy to deal with his issues. He also destroyed a cardboard cutout of his former self. The main way that he deals with his problems that won't go away is The Fiend. His representation is not an example of split personality because his host character acknowledges The Fiend. But by having two separate facets of the same character, it makes the presentation more special and more believable.