Callisto Eileen Potter
Callisto runaway

Blood status



July 31, 1980


  • Lily Potter nee Evans (mother)
  • James Potter I (father)
  • Harry Potter (brother)
  • Petunia Dursley nee Evans (aunt)
  • Vernon Dursley (uncle)
  • Dudley Dursley (cousin)


  • Hogwarts School of Witchcraft and Wizardry
  • Slytherin House


Black hair, green eyes, storm cloud scar on forehead

Callisto Eileen Potter is Harry Potter's twin sister in the story, "The Girl Who Lived" by Scarletmoon579. Like Harry, she has a scar on her forehead, though hers is of a storm cloud.

In The Girl Who LivedEdit

Callisto survived the Killing Curse, like Harry, but was separated from her brother. The story begins with Callisto running to 4 Privet Drive. It is revealed that she had been living on the streets. After breaking into the Dursley's house, she finds thirteen year old Harry and knows that they are somehow linked together.


The name 'Callisto' is also the name of one of Saturn's moons. Her middle name, Eileen, is the name of Severus Snape's (a friend of Lily Potter) mother.

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