|Romaji Name||Saitou Yakumo|
|Relatives||Unkai Saitou (father)|
|Manga Debut||Chapter 1|
|Anime Debut||Episode 1 - The Forbidden Room|
Yakumo Saitou is the main protagonist of the series, a college student who lives at the filming club room in school.
Yakumo is a tall young man of average weight and height. He has short spiky brown hair, fair skin and eyes with slitted pupils, the right is green and the left one is crimson red. He is usually seen wearing a white shirt with a pair of dark blue pants. In the first manga Yakumo has short straight black hair and his pupils aren't slitted.
He acts like a stranger and is not good with other people. Yakumo is blunt, sarcastic, and often comes off as cold or condescending. He also does not care about what others think. However, he has a kind heart and will help whomever comes to ask him for help. He often uses tricks and traps to gain what he wants; for example, he tricked a teacher, whose classes Yakumo often skipped, in to believing that he was cursed with a supernatural affliction and in payment for 'exorcism', full class credits. He often teases Gotou and Haruka about their relationships and intelligence. He has a surprisingly strong sweet tooth, as he often eats parfaits. Yakumo is also very ticklish; he automatically crashes in to the nearest wall from shock when somebody (namely Haruka) pokes him in the hip. Yakumo is shown to be highly intelligent, observant, and logical, often solving mysteries before the police. Yakumo is sensitive about only being able to see and speak to spirits and not being able to exorcise them. He often feels helpless at his own powerlessness. Yakumo is exceptionally guarded with his feelings and is close to very few people: Haruka, Gotou, his uncle Isshin, and his younger cousin Nao (the last he is very gentle with). He will go at great lengths for these people and risk his life to save them. Many people think Yakumo changed a little after meeting Haruka and appears to have developed feelings for her.
He has the special ability to see ghosts. He was born with heterochromia; a difference in eye color, the left one a crimson red, which he sees ghosts with. He believes ghosts and spirits are bound to earth because of a certain 'cause' and simply eliminating that 'cause' will those spirits rest in peace. He also believes that the human soul is made, and tied to the Earth, by emotion. Any strong emotion, such as extreme sadness or hate, will lead to a ghost being tied to a certain person or thing until they are released, as explained above.
- His first name, Yakumo, mean "eight clouds".
- Also, his last name, Saitou, is a japanese term that means "purification", referring to his ability.
- He is ticklish, and reacts rather surprisingly when poked on the side of the waist.