Rarity

 Bio/backstory: They rather have an easy life other than being known for a witch. She looks for jobs that could include Alchemy. Not for long they stumble upon Arthael. Arth offered her to be a servant instead, Rarity found it ominous but accept it when she heard she would get coin for it as well. After that Rarity never left Arthael's side.
  She grew to the customs. She was strict to her word and was quick to get snappy if things weren't going fair.