Orochi Kusanagi

An ancient member of the Kusanagi Clan, the blademaster of Takeru Kusanagi as well as one of the two leaders of Valhalla along with Mother Goose. He was the previous wielder of Lævateinn.

As a master of the Double-Edged Style, Orochi is fully devoted to the life of the blade and perfectly embodies the straightforward brutality of the Double-Edged Style's teachings. Orochi cares little for life and death and was merciless in the case he needed to draw his blade and had an extremely, and understandably, high opinion of himself and his abilities. Even if his duties as a leader of Valhalla required him to act in the organization's interests, he still valued his lifestyle the most.

Strictly outside of combat however, Orochi is essentially a stubborn and irresponsible adult. He is particularly demanding to his students and expected them to similarly embrace the fundamental mentality of the Double-Edged style for him to take seriously. He is abrasive and criticizing of them and quick to anger them for either his enjoyment or finding a flaw in their techniques. To Takeru especially, Orochi places high hopes on his decision making as he was in a similar circumstance many ages ago.

(Source: Taimadou Gakuen 35 Wiki)