Kai'sa: The Bioboosted Armor
If the reference in the title is too obscure, you need to check out Guyver. But the new champion seems pretty awesome. I'll break down my first impressions:
Appearance
I do like her, ignoring whether or not she's attractive, with a few minor complaints. I think her face should've been obscured in some way, if not entirely since I'd generally expect any kind of symbiotic parasite to be near/around the face first.. Glad the skin is going to have a helmet though. And on that note, she definitely looks like she could be a cash cow for skins. The on-release one appears to be Pulsefire, but she'd just as easily fit well with Battlecast, Mecha, Project, or Super Galaxy. Arclight and Dragonslayer (Or Dragonborn like Shyv) would be fine, too.
And she's not purple enough. But since the bluish color is the same as Kassadin's skin, it's fine.
Abilities I love that each ability is derived from another Void champion. Kha'zix's W, Vel'koz's E (visually), Kog'maw's (un-reworked) W+Kha's R, and Rek'sai's R, but all made unique for this champion. Plus, they finally made a champion that really makes use of the "adaptive" mechanic they added a while ago, rather than just having the option to build AP or AD.
I really, really hope that ability change based on adaptive stats becomes the new trend (you know, like how three-hit passives and invulnerability were trends for reworks/new champions for a while). Though it does fit most with a Void themed champion, it shouldn't be too difficult to explain with some story element for any other origin.
Edit: SHE CAN TOGGLE A HELMET. YES.