Satsuki is a highly energetic girl who never forgets to smile and make jokes, no matter how serious the situation is. She has a childish style of speaking and sometimes refers to herself in third person. She often inserts silly remarks in conversations, making her unpredictable and a "person who makes you tired by just talking with", as described by Yuki.

She's also described to be a strong-willed and passionate person by Yuki during their first free time event.