Alexa Bliss has been one of the most successful WWE wrestlers since the very first day of her main roster debut. She joined WWE in 2013 under the NXT promotion.
But she did not get much attention in the NXT. In 2016, during the WWE brand split she was handed her first boost as she was given a chance to shine on the main roster.

Why Alexa Bliss Is One Of The Most Complete Wrestlers In WWE Right Now
Bliss joined SmackDown, at first it looked like WWE is considering a mid-card or a lower mid-card run for her. But her Mic skill was so good that WWE had to consider a push for her. In only four years’ time, she won five WWE women’s championships ( three times WWE Women’s champion and two times WWE SmackDown Women’s champion), and two WWE women’s Tag Team Championships (Nikki Cross).
But then WWE planned a completely new role for the five feet of Fury. She was given the same role as the Fiend Bray Wyatt and since July of last year, she is performing this role extremely well. Even Alexa bliss herself accepted that this gimmick is pretty challenging for her when she spoke to sports guys talk wrestling show. She said;

Honestly, I don’t really know [whose idea it was to pair me & Bray Wyatt] at first, because I was told that I was gonna do a little insert in the Swamp Match that him and Braun [Strowman] had, because I was Braun’s Mixed Match Challenge partner and I don’t think I was supposed to be anything more than that but it kinda evolved into what it is now because you know, Braun and I did have a long history in WWE and then we were able to kind of play off of that and it really, it worked really well, and it’s been really fun and it’s been the most creative freedom that we’ve had in a sense but it’s also been one of the most challenging characters and the most fun.

There has been some criticism on her for doing this role as it is taking her away from her main focus and she is not having any feud on the main roster. But we believe she is playing her role perfectly.
The only thing she needs to improve is her laughter, which is not at all scary neither catchy. She can keep on carrying this gimmick after she is done with Bray Wyatt and such a gimmick would be quite fascinating for the overall Women’s Division as well.
(H/T and transcribed by Post Wrestling)