Jinx, born as Powder, is a notorious Zaunite criminal and inventor and Vi's younger sister. When she was a little girl, her parents were killed in a failed uprising against Piltover, leading Vander, the upspoken leader of the undercity, to adopt both her and Vi as his own daughters.

Jinx is slender, sinewy, and light-skinned. She wears common punk street fashion typical for Zaunite youth. Her most noticeable features are her tattoos of stylized clouds, her natural blue hair, and blue eyes.