Kōsei Tayō is the 17-year-old drummer for the band Haru no Jyuujika, where his vibrant personality makes him the essential moodmaker, consistently keeping spirits high. Born on August 4th, he is a Leo. He stands 172 cm tall, weighs 62 kg, and has blood type O.

His family background includes a complex relationship with his free-spirited father, who manages a real estate company. Among his personal preferences, he demonstrates a particular fondness for omurice.