Keith, better known as BF, is a 16-year-old high school student and a classmate of Pico. He has a crush on Pico and is bisexual. He is quite understanding and overly confident—consequently, he isn’t afraid of anything. His only fear is thunder. He loves donuts and enjoys skateboarding. He is 150 cm tall. His best friend is Otis, and his older sister is Hatsune Miku. His hair is not dyed; it is his natural color. He is autistic and antisocial. He is highly empathetic, often listening to others and caring deeply for the people around him. He is very loyal, though somewhat clumsy. In addition to donuts, he also loves cotton candy and cookies. When he grows up, he wants to be like his older sister.

