Melna Snow is an unseen character. She is the bastard daughter of Lyrion Bolton, and the cousin of Lord Roose Bolton. She works as a servant at the Dreadfort.
Melna was a young woman during Robert's Rebellion. She only met her father Lyrion Bolton once, when he claimed her, bringing her and her mother to the Dreadfort. Lord Roose Bolton knew of her, and kept her safe as a final act to remember his uncle by, despite seeing him as a coward.
Melna worked for a number of years in the Dreadfort, even enduring Roose' bastard Ramsay.