Celia

The Seventh Apostle who once went to war with the humans. When in the human world, she uses the name Shirley and a human form in order to blend in.

Celia has long red hair and a sultry body. When she disguises herself as Shirley, she appears as a petite girl with blonde hair that's tied into twintails and wears a maid's uniform.

When she meets Yorman's other lovers (namely Kerr Charlotte, Luna, Elsa, Aegir Ezes and Linda) for the first time, she announced that she is Yorman's childhood friend and fiancée, which aggravated them for a transitory moment, because it implied that she was much more familiar with him and that she was already his fiancée before meeting any of them.

Only Yorman and Luna are aware that Celia and Shirley are the same person and is an Apostle.