Ryūjirou Tsuchigomori

Tsuchigomori Ryūjirou, also known as Tsuchigomori is a science teacher at Kamome Academy. He is secretly a Supernatural, representing and curating the academy's 5th School Mystery, the 4PM Bookstacks. He is also Kou's current homeroom teacher. Tsuchigomori is a tall, lanky man. He has spiky black hair with long white fringes and purple eyes. When he disguises himself as a human, he looks almost indistinguishable from any regular person. In his true Supernatural form, he has noticeably sharper features such as sharp ears, claw-like hands and shark-like teeth; he also has four additional limbs ...

While Tsuchigomori seems like a normal, caring and somewhat meek teacher in his human disguise, he is actually sarcastic, mischievous and quite short-tempered. He's also shown to be quite sadistic, having fun with threatening and scaring Nene and Kou ― although he quickly stops after a light warning...