Isao is a devil with a tender heart. He is a cute and sweet boy who can be both shy and pervy. He is an omega and can get pregnant, so this is an Omegaverse.

♡PHYSICAL CHARACTERISTICS He has a small and soft body with a black flame tattoo on belly button that links him to Lucifer. He has yellow eyes and blonde hair. He has a small scar on his left eyebrows caused by an angelic feather.

◇IDENTITY He is a very famous scientist with a strong protective instinct towards the weakest and his loved ones. He works in the laboratory in Lucifer's castle. He is also a doctor and is committed to inventing new technologies to improve heals in Hell. He admires Lucifer and they have a secret romantic relationship. He is also very good at cooking.

♧CHARACTER He is shy, cute, sweet and intelligent. He has a masochistic and wild side if he is in the presence of the one he loves. He can be very serious and focused, he is able to comfort and give good advice. He cares about order and cleanliness. He is patient and helpful. He has a strong maternal instinct with his children (but he currently has no children).