Kou Yamori

Kou Yamori (コウ) is the main protagonist of Call of the Night. He was an honorable student but he decided to drop out of school and now he desires to become a vampire, a task with which he enlists the help of Nazuna Nanakusa.

Appearance
Kou has a slender build and black eyes with small pupils and hair with a spiky profile. He usually wears black baggy shorts and a plain white shirt underneath a predominantly black jacket with a white stripe down either sleeve. He also wears a pair of white leather shoes for footwear.

Personality
Kou is friendly, liked by most people, and a showcase student. Although he seems to have enjoyed a satisfying and successful life being honor student, Kou longs for other things. He dislikes being the center of attention and isn't motivated enough to maintain his excellent school performance. Kou also finds it difficult to sympathize with the other students. He quickly decides to turn away from school life and live a life as a loner. He's mature for his age and doesn't seem to be afraid of many things; for example, he roams the nights alone as a 14-year-old without much fear and gets involved with vampires without further doubt. Moreover, he has conversations with far more experienced and older people without any problems. His mostly sleepless nights prove to be a big problem for him; he can't sleep at all or only a little, so he has a pretty depressing appearance at the beginning. He also desires to become a vampire and does not generally understand the concept of love.

Kou is smart, managing to catch Arisa making fake peeping-Tom photos of herself for example.

Abilities (This section contains spoilers)

 * Half-vampire: Thanks to Nazuna sucking his blood, he turned into a half-vampire. While the full extent of his abilities isn't clear, it has shown to give him the powers of a vampire (superhuman regeneration, speed and strength) and amplifying them, making him able to destroy a building with one punch, even overwhelming a particularly strong and experienced vampire like Susuki. He couldn't initially control the ability, but it's shown that he turns into a half-vampire whenever he feels pain and bleeds, like when Nazuna drank his blood and he saw some on his hands, and during his fight with Mahiru in which his nose bled. He later learns how to control it and activates it by piercing his ears.
 * Control of blood: An ability unknown even to vampires. When Kou's arm was severed, his vampiric side intensified as his mind revolved more and more around Nazuna. He can control his own blood to such an extend that it's powerful enough to bring his severed arm back.

Trivia

 * Turning into a half-vampire seems to change Kou's personality to some extend, making him bloodthirsty like when he gleefully beat up Mahiru after the latter beat him up first, almost killing him before Nazuna interfered. He also became more assertive and intimidating. Akira described him as scary.