Ryo Asuka is a character from Devilman and a good friend to Akira Fudo. He is the one who is responsible for the events that happen in Devilman(the manga/80/90s/00s OVA) and has blonde hair/blue eyes despite being Japanese (since his mom was a foreigner as Akira put it in the manga). Go Nagai created him after finishing the TV series of Devilman and looking back, the show writers would have liked to have included him in the TV show.