Koji Hirose

'' The information below derives from a source not written by Araki. As such, it may or may not be considered canonW. ''

Koji Hirose (広瀬 康司, Hirose Kōji) is a major ally featured in the light novel JORGE JOESTAR. Koji Hirose is one of the characters that Joji meets in the 37th universe and later helps him find Yoshikage Kira. Koji is also the user of Blue Thunder.

Appearance
Koji Hirose appears similarly to Koichi Hirose from JoJo's Bizarre Adventure: Diamond is Unbreakable, but slightly taller and wears a white buttoned up T-shirt in his initial appearance.

Stand
Koji is the user of the Stand, Blue Thunder. It is simply just a propeller on his head which allows him to fly.