As a ghost, Tsukasa appears to be cheerful and extremely childish. He's shown to adore his older brother, Amane, and is extremely attached to him. Due to this childish demeanor, he is often treated like a little kid by Sakura, his assistant, whom he is bound to by contract. Conversely, he is capable of carrying out extreme acts of violence with no remorse. This is shown when he gleefully cuts into a pufferfish just to see what they look like on the inside, despite being warned against doing so.

Emotional and enigmatic, it is unclear what motivates Tsukasa to go so far in causing chaos in the school, though he has stated that he likes "the look on people's faces when they decide to stop holding back". He's shown to believe that the rules and order between supernaturals and humans isn't needed, and thinks that supernaturals should act however they want.

When he was younger, Tsukasa retained virtually the same personality. He was cheerful and frequently looked for items to cheer his sick brother, Amane, up. However, he is distraught when he hears his brother has not much time to live and sacrifices himself for Amane's welfare, disappearing after this. After his disappearance, and return; their mother momentarily noticed something was off with him, before consulting with the shrine priests.