Side Facts: Healing magic, Doesn't understand Kira's dirty jokes, Keeps a small little diary, Owns the worlds largest plushie collection(15,698), Becomes half-cat monster like her real father, and her locket becomes a Tattoo
Backstory: Her parents didn't care much or paid attention to her and she didn't have many friends. When helping her mom clean her room she finds a Cassette player with unmarked tapes. When she listened to them she heard what happened that her real dad was a Monster who died in the war against humans. Mercy ran off upset into Mount Ebott trying to find a place to hide. She fell down below and met Flowey, although Flowey was mean she made friends with every monster underground. Suddenly Kira was brought to her timeline for rehabilitation Mercy was excited to have a sister.
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