Mary

Vampire Hunter. Its true identity is a vampire who served under Elizabeth a thousand years ago.

When Elizabeth's blood went berserk, it was the only survivor, and Elizabeth, who committed suicide, asked it to scatter her ashes in the sea. However, since the suicide failed and it did not turn to ashes, it could neither obey nor defy, and continued to guard Elizabeth's corpse. However, the corpse was stolen by Crimson, so it is acting to retrieve it.

Mistakenly believing that her younger brother was kidnapped, Claire infiltrates the Red Tower with her, encountering the Shadow Garden unit led by Beta and Juggernaut.

Afterward, it witnesses the battle between Elizabeth and Shadow, and once Elizabeth's blood frenzy subsides, they set out on a journey to find a "place of rest."

It has not appeared at all in either the web or book versions since then. In the TV anime version, in the second season's eighth episode, it is depicted standing in line at the entrance of Mitsugoshi Hot Springs Land with Elizabeth, and inside the facility, it is seen fanning a content Elizabeth with a fan after a bath, attentively taking care of her.