Void champion so original yes yes, I know.
Her exact backstory is a mystery even to me, but I was imagining something beautifully cliché like nasty void energy from SOMEWHERE creeping into someone's womb and corrupting the daughter inside, causing her to emerge into the world very, very messily. She's taller and bulkier than your average woman (something like Vi's fabulous thighs but everywhere) with really long unmanageable hair that seems faintly translucent (only instead of letting you see through to what's behind it, which would be her terrifying shadow-clad-for-the-sake-of-sanity face, it's actually a portal to the purpleish starriness of the Void) and blows in wind that isn't there unaided, and abnormally large hands ending in what are commonly mistaken for long fingernails, but really, really aren't. Big bright sharp teeth too. Probably. Creatures of the void are renowned for their fantastic dental hygiene.
Anyway this is an idea, and I can't art but I'll see what I can do.
And I screwed up the name but I'm way, way too tired to do anything about it.