Becky is one of the students from "Doof 101". She is one of Vanessa Doofenshmirtz's friends. She apparently owns a crossbow and finds nothing weird about it. She is never referred to by name in the episode.
Becky is as tall as Vanessa, and has blonde hair tied in a ponytail and a lavender hairclip. She also wears a lavender dress with long sleeves and white shoes.