concept: Chimera

A champion who takes "consume and adapt" to a new level. The passive causes you to gain aspects of enemy champions if you can kill them multiple times. It would start out less effective, but with enough kills, will scale up to the effectiveness of the original.

Example kit

P: Phagogenesis Killing the same champion 3 times will empower one of your spells with an aspect of their kit. Killing that champion thrice more allows you to make it more powerful, up to 9 kills, when it becomes just as effective as the original.

Q: Generic magic damage linear skill shot, hybrid scaling, stops at first target. Killing bard several times will cause it to take on the properties of Bard's cosmic bind. (damage unchanged, utility added)

W: Defensive Shield, hp scaling. Killing Tahm Kench several times causes a percentage of the shield value to be restored to the chimera as health.

E: Stalking Chimera becomes camouflaged for several seconds (health bar becomes hidden, champion icon removes from map, and model changed to blend into the terrain, but not stealthed).

Killing Teemo several times causes Chimera to gain attack speed upon leaving camouflage.

R: Claim Chimera claims an area as it's own, causing it and its allies to gain x% movement speed and damage output while inside. Enemies inside are debuffed for half that amount.

Killing Trundle several times causes Chimera to gain attack speed, movement speed, and increased healing while in the zone.

Some champions, like Aatrox, buff Chimera without touching his spells. Killing Aatrox several times causes Chimera to gain blood thirst as a passive.