#4 AJ Styles

One big reason why WWE's Blue Brand gained popularity at the start of the 2016 brand extension was the presence of The Phenomenal One on SmackDown Live. AJ Styles established himself as the face of Tuesday nights, participating in some incredible rivalries -- in his time on SmackDown Live, Styles stood across the ring for rivalries with Dean Ambrose, Samoa Joe, Shane McMahon, Kevin Owens, Shinsuke Nakamura, John Cena, and even Jinder Mahal.
He often referred SmackDown as 'The House That AJ Styles Built,' and no one questioned his claim. He joined RAW during the 2019 Draft and held the United States Championship for some time. As WrestleMania 36 approached, WWE inserted Styles in a rivalry with The Undertaker.
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The fact that WWE booked him to take on The Deadman at the Showcase of Immortals reflects that a lot of people backstage love him and would likely trust him pushing him as the face of RAW while Seth Rollins takes his break. He may have fallen to The Undertaker on Saturday night, but with one hand still sticking out of that grave, it means AJ Styles may be down, but he certainly isn't out.