Tsukasa Kuzunoha is the protagonist of Kotonoha Project, a high school student with the ability to hear honne (本音): the true feelings of other people and give them physical form.
Tsukasa is a young man with slightly disheveled short blond hair and bright purple eyes. So far he has only been seen wearing his school uniform in one way or another. This always includes grey pants and a matching blazer with the school's logo over the right breast; additionally, he always has a pair of headphones on so that he can block out people's thoughts.
- In Kotonoha Karma and Itazura, he wears his uniform with an untucked white dress shirt, a navy blue scarf with white wave-like patterns at either end, and red headphones.
- In Kotonoha Yuugi and Reverb, he wears a lighter grey cardigan and a lavender dress shirt, as well as a purple scarf with white floral designs at each end and dark blue headphones.
- In Brainwashing (Sennou) and Barbed Eye, he wears a white, long-sleeved dress shirt with a teal blue cardigan on top along with a black blazer, which is white inside, over it. He wears yellow necktie tucked into his shirt. His headphones are white with a blue circle with three white dots on each earpiece and three yellow stripes. He wraps his scarf, which is dark, blue with yellow triangle outlines, around his left arm.
- In Blustering Behavior (Karaibari Behavior) and I don't understand (Wakaranai), he is shown with red eyes instead of his usual bright purple eyes (except in what appears to be his younger self, which alternates between green and purple). He wears his uniform with an untucked white dress shirt, red necktie and a green scarf with wavy patterns at either end. His headphones are red with orange dots arranged to look like a flower.
- ( Update for Heaven and Hell (Tengoku to Jigoku) )
"Despite his lazy appearance, he does get things done when he must."
Despite his ability, Tsukasa appears to be a fairly average high schooler. As shown in the light novel, while not outright rebellious, he has little respect for authority, and dislikes blindly following orders. He has no problems stating his thoughts outright.
At the beginning of the light novel, Tsukasa appears to have transferred schools.
He is known to have a younger sister named Sora, who is the main heroine of Blustering Behavior.