#2 Finn Balor
Balor had been a prominent figure in New Japan Pro Wrestling (NJPW) as a member of Bullet Club. After signing with WWE , he was drafted to NXT where he stole the show with his 'Demon King' gimmick.
He became NXT champion and a few months later, he was drafted onto the Raw roster where he became the inaugural WWE Universal Champion.
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However, his reign was short lived due to an injury. He was out of action for almost a year, and when he made his return Brock Lesnar was holding the Universal Title.
Mr. McMahon considered him not being good enough to face 'The Beast', just because of his not so big size, so he never got his rematch for the Universal Championship.
While likes of Seth Rollins did have some mid card titles (IC title and Raw tag team titles) around their waist, Demon King has remained without a title since his return. With no proper storylines and feuds, Balor has become somewhat irrelevant on Raw.