I kind of dislike his current E & Ult. From the Lore, it was him who personally influenced Tryndamere to obtain his Undying Rage, the motif of him Reviving as himself if someone else interacted with his Sword after his body turned to ashes from dying ingame & leave a last enemy with 10% health similar to Tryndamere's ULT if he(Aatrox) did score an assisst or personal Takedowns but then we had Viego's Passive. I also wished Aatrox can nearsight enemies he were upclose with during his humongous state same with other champions.
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Passive: Bloodwell - Dealing DMG fills Bloodwell, DMG dealt heals by 50/75/100% amount filled but also depletes by the same amount DMG taken (Old Mordekaiser Passive but does not shield him)

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His Q could have been similar to how Camille's W can still be reposition from moving before the animation finishes winding up. During the 2nd & 3rd Sequence, Aatrox can pass over terrains until his animation finishes. During his 3rd Sequence, he can dodge "Lower/Middle Horizontal" Area of Effect, Melee attacks or Skillshots until he crashed down

but he cannot dodge Nasus' Q, Darius Ult, Janna, Yasuo/Yone's Wind attacks, Nami's, Morgana & Kayle's Q Riven's 2nd/3rd Q & W, Lissandra's Q, Galio, Nautilus, Mordekaiser, only Skarner's Q briefly, Kayn/Rhaast's W, Xerath, Xinzhao, Pantheon, Malphite, Lux, & some others. (He weren't 100% invulnerable as during Xayah's ULT or Fizz's E, i.m.o nerf Fizz's E)

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His W-Vigor Scourge could have been a buff when if Aatrox hits his Q-Darkin Blade's Crit spots towards a champion, he can cast W to mimic the Sequence of the Recent Q-Darkin Blade similar to Twisted Fate's W needing to be casted 2x to lock & pick before cooling down or could just be a Sylas ULT but on Champion's Q/W/E with a Blade attacking (Yasuo's Q, Fiora's W, Master Yi's Q, Sivir's Q, Tryndamere's E, Pantheon's Q/W/E) Applying W against the mimicked Champion or Dealing Critical hit on his Q's Focused Edge against champions would reduce W-Vigor Scourge's Cooldown

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His E-Infernal Chain's active could have been Buffing Aatrox's next Q then Enemies taking Critical hit from the Focused Edge of Aatrox's Q, would be tethered, applying Grievous wounds, redirecting DMG taken by Aatrox & stealing % healed by enemies champion bound with

Active: Aatrox would steal movement speed dealing Physical DMG as he pull himself towards or the enemy towards himself based on size but not as upclose as Nautilus or Blitzcrank's Q

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His Ult-Darkin Ascent could have been: Passively if Aatrox were taken down by an enemy, there's a chance they can Revive Aatrox either or not in their stead . Scoring Takedowns would also apply to Aatrox himself.

If Aatrox were takendown by an Enemy upclose with 60% more H.P, they would get to play as Aatrox himself for a duration of Aatrox's Active ULT by the end of it, Aatrox revived, would separate with the chosen host having Equal amount of H.P.

If Aatrox were taken down by an enemy below 40% H.P, Aatrox would personally revive & by the end of his ULT Duration, the Enemy champion would be separated with him having 10% H.P but unable to die for 8s. Against Tryndamere, Pantheon, Kayn/Rhaast & Automaton(Blitzcrank, Galio)/Undead, they would simply be in stasis for the whole Duration Aatrox revived.

Darkin Ascent-Active: Aatrox's Bloodwell accumulated would be periodically consumed as its duration to grow large, extending his Area of Effect reached, having Bonus H.P based on his AD, Movement speed & nearsights Enemies taking DMG from his Q's focused Edge.