Because he's a rat and it looks cooler than some low res lady (because of the icon's size). Can we stop trying to find things to get offended over?
Probably because that ability icon looked a lot nicer than old Evelynn's.
I think it's because that icon fits the term camouflage more than Eve's passive icon does
They came out the same day
I think that's just a placeholder icon until they get actual unique art for it. That's just Twitch's Q icon.