QOL for Cassiopea....
Honestly, in a team fight with spells particles everywhere, it can be hard to see if a target is poisoned. The purple bubbles that appear over their heads is sometimes blurred out by all the stuff that is going on the screen.
I know you can tell if she landed her Q by the sound it makes after and her move speed buff. But there is a delay in before you can be sure. This is even more crucial when dealing with mobile targets like 
I wish the icon was as clear to see like braum passive at the bottom of the target. It could also indicate the duration of the poison like Yas E.
Would that be asking too much?
on her more so i can tell who i've applies poison too than for the slow effect lol. It definitely needs to be clearer.
, but i definitely agree.
blink is particularly bullshit in how it interacts(it doesn't) with CC.