Rin Okumura from Blue Exorcist
In Blue Exorcist, Rin Okumura is the son of Satan. In his demonic form, blue flames emanate from his head, he has long elf-like ears, and his eyes have red pupils with blue irises. Although Rin can be violent and gets into many fights, beneath all that he has a kind heart and is full of compassion.
Shura Kirigakure
In Blue Exorcist, Shura Kirigakure is an Upper First Class Exorcist who works for the Vatican. The symbols on her chest and abdomen are seals from which she can produce various items like her demon sword. Even though her outfit and attitude might seem laid-back and carefree, she takes her job of destroying anything related to Satan seriously.