Lalavava "Olga" Astronomonov is an evil and scary little girl who is Dee Dee's rival, Mandark's little sister and second born Lovechild of Oceanbird and Windbear. She appeared in the episode Dee Dee's Rival where she and Dee Dee both got into a fight over who was a better dancer. Like her brother, she is voiced by Eddie Deezen.
Her as she appears on Powerpuff Girls Doujinshi