Eternity

Red Hell's most trusted and powerful Servant, belongs to Noire who is also Eternity's sister. She likes cats despite being allergic to them.

Eternity The Demonic Servant
A small young girl wearing black military looking boots, with a black skirt and a belt which has a golden symbol being the symbol of Red Hell. She's got a white undershirt with a waiter-esque black vest on top. Her hair is tied up into two bright pink ponytails on either side of her head, with two steel spiked "hair ties" holding them in place. She has two small black demonic wings on her back.

Hellenkitties
Eternity controls all kittens and cats of Hell, despite being allergic to them, she loves them as much as they love her.

Love
A dangerous rare ability in Hell known to only be used by the Devil's close family. Love's effects vary from completely changing a person's mind to having them do your bidding.

Personality
Eternity loves to fight, especially if it's someone famous or infamous. While she may seem constantly suspicious of everyone, she does relax when she's amongst some cats, until she has to cleanse herself to avoid having an allergic reaction.

Ideals
Eternity strives to cure the curse that her family has, which is the curse of being allergic to cats.

Trivia

 * Eternity's spiked hair ties are actually rings, don't tell her though, she hasn't realised yet.
 * Eternity is the only member of the Devil's family that loves cats.
 * Eternity got the idea for her outfit from some punk band she likes, I wonder which one though.