Rain

Rain (レイン), also known as Bleu (原初の青) is the blue Primordial and subordinate of fellow Primordial Guy Crimson.

Appearance
Rain wears a deep-red maid outfit with blue long sleeved gloves. She has medium-length blue hair, blue eyes, and is considered very beautiful.

Personality
While she may seem to be a composed beauty on the surface, Rain does not like working, she leaves most tedious tasks to Misery and usually complains when she is forced to work. Her internal thoughts appear to be somewhat carefree and bubbly based on her her thoughts from "The Blue Demon's Monologue". She is absolutely loyal to Guy to the extent of rejecting an offer of freedom in favor of continuing to serve him.

Background
Eons ago Rain teamed up with Misery in a bid to remove Guy Crimson from the throne of hell. They were easily beaten back and their cores were crushed into dust at Guy's hand. When they revived they accepted the absolute fact that Guy was their better and pledged to serve him for all of eternity as his faithful servants.

When Guy was brought into the material plane he summoned Rain and Misery, giving them bodies of flesh and ordering them to slaughter the nation that had summoned him. When the task was complete Guy observed the rain falling from the sky and decided that it would serve well enough as her name.

After that point Rain and Misery followed Guy as they roamed the earth. They learned how to do various chores such as cooking and cleaning, and learned various arts such as music and dancing all to keep their lord and master entertained.

Trivia

 * While Rain did not exist in the original web-novel, a daemon named Hirari existed as Guy's other maid instead.
 * In some illustrations, her eyes are green.
 * A portion of Guy's personal forces are made up of the demons who are descendent from Rain as the Primordial of Blue.