Yakumo Saito 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 whoever 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 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.