What should be Aatrox's identity?

I could rant about his poor state right now...

But i'll talk about his future rework.

It is clear that Aatrox's concept is flawed, as he doesn't really have anything that makes him unique, that makes him distinct from other divers. Unless he's overtuned, there's no reason to play him over a Xin, a Tryn or a few others.

I am interested to hear people's opinion on the matter. What could make Aatrox unique?

Some say his ult should inspire allies, much like how he inspires armies in his lore.

I personally believe Aatrox should be the guy that stands and keep on fighting in teamfight. He doesn't provide CC or utility, but dives into teamfights and delivers damage while being seemingly impossible to take down. His passive could be reworked to be something similar to Kled's second health bar. When his health reaches zero, he taps into his health reserve and can keep on fighting unless he receives enough damage to bring his secondary health down too. He would have a few seconds to life-steal all lost health back, otherwise he dies.