Ellie Williams (Last of Us)

Ellie Williams, is a 14-year-old orphan with a mysterious immunity to the Cordyceps brain infection due to a mutation present since her birth

Her immunity could potentially be used to create a vaccine, but extracting it would result in her death as the fungus is integrated with her brain. In the series, Joel Miller is tasked with smuggling and safeguarding Ellie across a post-apocalyptic United States. Ellie displays defiance and anger but has a private need for kinship and belonging. She is strong-willed, playful, and bonds easily with children.