#2 The true male babyface donned by AJ Styles
They say the toughest pro-wrestling gimmick of all time is that of a "true male babyface." You aren't going against the authoritative figures; you aren't betrayed by your tag team partner; and, you aren't an underdog fighting your bigger size opponent. You are the simple babyface who captivates the crowd with his charisma.
John Cena and Roman Reigns are also playing the same role. While the former played a huge role in the company's success when they transitioned out of the Attitude Era, not many would say the same about the latter. The chants of "Cena sucks" echoes in the WWE Universe because of the company's dissent to change his gimmick.
While these two have gone stale, AJ Styles hasn't. Ever since he turned face by shaking hands with Shane McMahon, he has been the topmost babyface of SmackDown. What separates him from John Cena and Roman Reigns is his ability to bring the best out of his opponents. No one had thought that he could make Jinder Mahal a reckoning force in their matches. But, Styles proved all of them wrong.
The persona might only be a year old, but we don't see him going heel any soon or changing his gimmick. For his perfect personification of the true male babyface, the "Phenomenal One" gets an A+.