Barbara Pegg is the younger sister of Jean, though the two sisters could not be more opposite in their upbringing. Barbara was raised by their father while Jean was raised by their mother, Jean was trained to lead Mondstadt while Barbara was raised to be devoted to the church and Barbatos.

The two sisters have begun mending the gap between themselves ever since enrolling at Teyvat University, with both of them being part of the Knights fraternity with Barbara being an idol due to her singing talent and many on the campus loving her impromptu concerts with even the normally stiff and composed Fatui admitting that Barbara has a great deal of talent and offering their assistance should she ever wish to perform concerts in Snezhnaya.

Barbara is very warm and upbeat, almost described as the ideal concept of an idol