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About two years prior to Dark Reign: Young Avengers #1, she met Egghead and since then they have apparently been boyfriend and girlfriend. She is a white supremacist, who has started changing Egghead's parameters so that he disrespects all other races, just like her. Some unspecified time before the comic, she was asked by Coat of Arms to join the New Young Avengers/Young Masters. She is one of the Masters seen using her powers to kill people, after squashing one guy to death. She also seems to enjoy all things British, having been seen wearing a British flag, and talking about Austin Powers and Monty Python.
Big Zero was created by Paul Cornell and Mark Brooks in 2009 and first appeared in Dark Reign: Young Avengers # 1.
She is apparently a size changer, who is able to both shrink and enlarge herself though she has only been seen enlarging herself. She is apparently able to go up to 100ft tall, though this is unconfirmed. She also has some ability with machines, as she is able to reprogram Egghead.