Duchess

Nessa (ネッサ Nessu) is a spirit currently contracted with Estella Collier

Magic and Abilities
Water Magic(水の魔法, Sui no Mahō):

Transformation Magic(変身魔法 Henshin Mahō):

Immortality:

Trivia

 * Her appearance is based on both Puck and Ferris from the Re:Zero Series.
 * She gets her name from a famous Kelpie, a water spirit and trickster.