Sasaki is presented as a bright and cheerful upperclassman, albeit overly anxious. He can be impulsive, acting or speaking without thinking about the consequences or the people around him. He can be a bit apathetic at times, both with his friends and with his family. His personality can drastically change with certain people, showing a more cheerful, caring, and somewhat flirtatious side of himself. Sasaki is gay and is interested in guys.