Keisuke is a kind brother, being the only one in their family to take care of Satsuki. He'd tell her to 'live happily' and was supportive of her attending Hope's peak academy. He was the most skilled of their brothers in the family circus troupe. After joining the Kisaragi Foundation, he becomes more serious and adopts Tsurugi's ideology, even going so far as to almost sacrifice Midori.