I think it'd be cool if Akali revolved more around her Shroud (W)
I think Riot is generally prepping for an assassin rework, if not, Akali's been brought up as a champion they want to look at for an update in general. From what I can tell of Akali's playstyle, her W basically is just a tool to help her CS safely pre-6, and then post-6 is either just CC or something she uses to take a breather between jumping on everyone. I really like the way Trundle's Frozen Domain creates this zone of control/home field advantage, and I think it'd be cool if Akali's shroud did more of that/was this hub that her gameplay could focus around
My idea is that her ult charge cooldown is increased, but Akali regains charges twice as fast while stealthed in her W (and her W duration is extended as necessary). Akali is also able to ult to any location in her shroud, which refunds a portion of an ult charge. This isn't a full reset, so the enemy team still has a few seconds to lock down Akali if she defensively returns to her shroud, but also gives Akali a flexible defensive option at the cost of an ult charge. The rest of her kit, as well as just balance tuning, is up for debate, but giving her another defensive gameplay option may mean she doesn't need to rely so heavily on spell vamp.
EDIT: Just in case this wasn't clear, this is supposed to be like, half of a rework suggestion, where I'm just making a suggestion on a part of her kit that I think could be cool but is unexplored in her current state. I imagine her Passive, Q, and E would also change in some way to make the kit cohesive.