Camille's E
Don't you think that someone who loves precision and probably hates Vi, has an ability which is literally a sped up Vi Q?
Seriously, there's enough walls on the map for the first half to just be an extension, although the angles are weirder.
My proposal is to change it to a small targeted, aoe skillshot, like Aatrox's Q. She can end up flying over the enemy's head and missing if she doesn't have the precision necessary.
Also, this would let melee range knockups cancel her E, which should be a thing. Rn her E is canceling the knock ups.