Rassiel

Rassiel, also known by her alias Mana Reiko. Is one of the characters appearing in Highschool ExC. She is a former Seraph and is the co-founder of the Grigori and is currently it's secret Governor General. She is also a teacher at Kuoh Academy, often substituting for Hiro's homeroom teacher, as well as the school nurse of the academy. Reiko is also the advisor of Rudori's Scientific Research Club.

Appearance
Reiko is a stunning woman with a voluptuous figure. With turquoise-colored eyes. She has hip-length, brown hair similar in color to Hiro's albeit darker, semi-rimmed glasses and a mole under her left eye. She usually adorns a green sweater with a white robe on top, a short skirt and long, brown tights.

Although during her true form, she takes on a more youthful appearance than her disguise. Her hair turns blonde and the green color of her turquoise eyes become more dominant.

Personality
Hiro describes her as a kind, caring, but strict mother that is easy to depend on. She also adored him a lot when he was a child and rarely denied him of the good things in life. During his years in highschool, she became slightly emotionless but still kind and caring, although being more strict than ever as well. In reality, she is like this to everyone. Although this may or may not be part of her disguise.

During her real form, she acts like a girl similar to her actual age. Someone who is shy and easily gets flustered. Azazel has also stated that Reiko fell because of her indecent thoughts towards young boys, which is also ironically the cause why she accepted to adopt Hiro and raise him as her type unknowingly.

Compared to others, she cares deepest for Hiro. Seeing as she went as far as using her real powers to put him to sleep, and then heal his body from the stress it was receiving due to his lack of sleep.