Give Kha'Zix the Victor treatment
And make him able to evolve all of his skills. Of course it would be balanced as needed.
EDIT: And make his damage not revolve around a target being isolated. For example, his passive it would read "Every 6 seconds, he will emmit a sound wave in an AOE around him(similar to a dolphins echolocation). If an enemy is isolated and is hit by the sound wave, Kha will be alerted, gain vision of the target and gain massive movement speed while running towards the marked enemy. The mark will be removed if the enemy gets within ally range"