I was always fancied with the idea of a "Void Zac"
He would be purple or black and he would be covered in eyes with a crooked smile thrown in somewhere like this:
http://fc00.deviantart.net/fs70/i/2010/072/1/c/__FMA___Pride_by_Neiths.jpg
When he dies, he spawns goo voidlings that crawl with 2 arms slowly towards each other.
His Q is him throwing out his arms in a swiping motion while forming them into claws.
His W is him exploding but the goo spiking out is instead a bunch of arms formed from his body that rip and tear at enemies around him.
His E is him spawning 2 goo voidlings to act as sling posts and when he jumps, they throw him and disappear.
His R is him turning into a giant goo blob with rows of razor sharp teeth while jumping up and down trying to catch anyone in his mouth.
The blobs he would leave behind would be dark puddles on the ground of two eyes and a Cheshire smile.
Thoughts?