Momoka Oginome

She is Ange's personal maid, who has been serving her since they were children. Unlike Ange she is capable of using mana. She knew that Ange is a 'Norma" and has kept it a secret from her and to others, she admires her very much thanks to the kindness she received from her when then they were little. Her dedication to her is so great that she herself went to Arzenal to look for her, putting her own life on the line.

(Source: Wikipedia)