You know who would be good enough to voice Yorick? Tobin Bell aka Jigsaw from Saw. Imagine him with that rusty voice and you got a creepy champion.
I want Riot to make Yorick the only benevolent Shadow Isles resident. Given by his soon-to-be-outdated lore, he was a grave digger throughout his life and died without an heir to carry on his family's legacy. Now he's risen to dig up the graves to harness a vast army of undead.
Here's what I can picture:
- Yorick never wanted to be resurrected. He just wants to rest and join with the rest of his family in the afterlife.
- He was forced to dig up the graves he buried. He never liked the idea of raising the army of death.
- Yorick would probably hate most of the Shadow Isles champions: Mordekaiser because he a big douchebag, Hecarim because he supports what Mordekaiser's doing, Thresh for torturing the poor souls, and Elise for luring innocent people to be sacrificed to her so-called "spider god." Although he has "some" respect for Karthus, but doesn't approve his method in just killing the living to embrace death. He only met Kalista once and only warned her where her path of vengeance would take. If Evelynn stays as a Shadow Isles champion, she might be the only one that's considered a "friend" for Yorick, despite acknowledging her as a nuisance. He knows Illaoi doesn't like him because he's undead, he wouldn't blame her. Even Yorick doesn't like being undead. He knows about Kindred and wishes for a quick and painless death from them if they ever meet.
- Every Harrowing, he would sneak souls of the dying into his lantern as a safe haven. In return, the souls give his lantern light, enough to give Yorick a glimmer of hope. The souls sometimes emerge from the lantern to aid him, even fight for him because of his noble deed.
I like your picture, especially when you didn't make him a hunchback. I've wondered if he might have some kind of skeletal deformity in one of his legs, causing him to limp every time he walks. He could have broken his leg some time during his life and never truly healed.
This is just my headcanon, though.