#4 Adam Page

Adam Page has mainly been a heel during his ROH tenure and has been part of the Decade and Bullet Club factions.
He is country strong and is even able to pull off some high-flying moves like a shooting star press off the ring curtain.
Female superstar says she inspired John Cena turning heel HERE
He's been a midcard staple in ROH and has made a sizable dent in NJPW with the Bullet Club.
Whether he's tagged with members of his faction or wrestled by himself, he's had great matches with the likes of Jay Lethal, Tomohiro Ishii, Kenny Omega and members of Los Ingobernables de Japon.
Page's character is a little less defined than those like Marty Scurll and Dalton Castle, but he's a damn impressive guy to watch nonetheless.
He could easily start out as a no-nonsense brawler who becomes an important part of a faction or enforcer for another wrestler like The Miz or another cowardly heel.
He'd be popular regardless of alignment and his wrestling style. Just watch him do his standing moonsault/double kicks to the chest combo.