Helgi (Skyrim)

Helgi is the ghost of a little girl who asks you to play hide and seek with her after dark in the Laid to Rest quest in the Morthal. She can be found in the burned down building.

She is mentioned in a letter written by Anise which can be found on the desk in the basement of Anise's Cabin. Anise asks Helgi to come live with her in the forest to form a coven.