Ingress of the House of Arch

Ingress thinks River is neat, but she's also sad, and maybe sick, a lot of the time. When she sees River unhappy, she takes it upon herself to make her feel better, to cheer her up. Of all the "big girls" she talks to, River is the one most like a kid to her.

Funnily enough, I don't think she knows that River is a gunslinger.