A flame haze contracted to Balar.
Rebecca holds the tittle "Scatterer of Sparkling Light", and her flame color is pink. Her contractor is the "Widened Eye of Incineration" Balar, the golden bracelet she wears (Cruach).
She seems to have a very upbeat personality, having a tomboyish behavior. She has no qualms about destroying or blowing up certain places to get what she wants, such as blowing up Keisaku's door and firing at Flieder to get out of the way. However, she has a strong sense of duty (with a little help from Keisaku), as she chose to help Wilhelmina in her quest to save Shana instead of aiding the Outlaw branch at Tokyo.
In the anime, she's voiced by Hōko Kuwashima.