Mer Merdein

About

Mer is Sienna Merdein's familiar and it's her duty to manage the floor of Akron on which Witchcraft is located. Her consciousness is located within Witchcraft.
Her personality was based on Sienna from when she was a child. Although she is more than 200 years old, she tends to act like a child by pouting and cursing and usually acts this way around Eugene Lionheart during his studies in Akron.

(Source: Damn Reincarnation Wiki)