New Champion Reveal, Kai'Sa!

Kai'sa

Daughter of the void

From what I've seen so far, she might be played as an ADC, we will find out!

Her abilities: 

 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.

Living Weapon:
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.

Living Weapon:
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.

Living Weapon:
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.

Living Weapon:
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.

Her skins: 

Credit: https://na.leagueoflegends.com/en/featured/champion-reveal-kaisa