Gensuk - The void doll
Ok, so I don't know much about balancing, so I'll leave out cooldowns and specific scaling etc.
The idea goes that Gensuk was originally a magic infused doll that aided the wizards in runeterra, however this particular doll found it's way to the void wherein it was infused with the powers of the void. Gensuk would be yordle sized, purple in colour and rather eratic in his actions and animations.
Passive: Doll Play Every so often, when Gensuk is damaged, he will create a substitute of himself than cannot move or deal damage. Gensuk will turn invisible until the substitute is destroyed. Dealing damage does not break invisibility. The substitute takes a number of hits depending on his level.
Q: Crumbling Earth While active, Gensuk deals passive damage around himself that scales with AD. Consumes mana per tremble. This will also silence enemy champions in the area for a period per tremble.
W: Void Walk While active, Gensuk travels to the void making him invisible to other players (Including allies) as well as making other champions invisible to him. Should Gensuk enter True vision then Void Walk will go on cooldown. Active for a period of time, can be disabled by reactivating void walk.
E: Void Leap Gensuk launches at an enemy sticking to their back dealing damage (AD) and becoming untargetable by the target. He will fall off after 1 second. Before this he is untargetable by the target, but other targets can hit him. This ability can be used on towers.
R: Puppet Gensuk activates puppet on an ally, channelling for 2 seconds, until Gensuk loses his own abilities (For a period of time) and gains the traits of his ally. All items and abilities are replaced for this period, any kills or assists earned go to the original owner of the abilities, and Gensuk will gain an assist for each of these.