Daughter of the void
From what I've seen so far, she might be played as an ADC, we will find out!
Passive - Second Skin: Caustic Wounds:
Kai’Sa’s basic attacks mark enemies with Plasma, dealing increasing bonus magic damage. After a few successive attacks, the Plasma ruptures for a burst of damage based on the target’s missing health.
Nearby allies’ immobilizing effects add stacks of Plasma.
Kai’Sa’s symbiote-suit adapts to her chosen attack style, evolving her abilities based on permanent stats gained from shop items and experience level.
Q - Icathian Rain: Kai’Sa releases a swarm of missiles evenly distributed among nearby enemies, with additional hits on the same target dealing slightly reduced damage.
With enough bonus Attack Damage, Icathian Rain fires significantly more missiles.
W - Void Seeker: Kai’Sa fires off a beam of Void energy, revealing the first enemy hit, dealing magic damage, and applying stacks of Plasma.
With enough bonus Ability Power, Void Seeker deals more damage and partially refunds the cool down on champion hit.
E - Supercharger: Kai’Sa charges up, briefly increasing her movement speed but losing the ability to attack. After charging up, Kai’Sa whips out the big guns to increase her attack speed for a few seconds.
Basic attacks reduce Supercharger’s cool down.
With enough bonus Attack Speed, Supercharger briefly grants true invisibility while charging up.
R - Killer Instinct: Kai’Sa dashes at extremely high speed with long range to a location near an enemy champion marked with Plasma and briefly gains a damage-absorbing shield.