Stiyl Magnus is an antagonist but sided with Touma and his friends in the novel, anime series A Certain Magical Index.
His blond hair is dyed red and hangs on his shoulders. He wears a black priest robe and has a silver ring on each of his ten fingers, earrings on both ears, and a barcode tattoo under his right eye. Despite being fourteen, Stiyl is a tall man with a strong perfume smell, and is often seen having a cigarette in his mouth, as he is an extremely heavy smoker. He claims a world without nicotine would be hell and that he dislikes Academy City since it's hard to get cigarettes as a minor.
Because of this and along with his personality, Stiyl seems more mature than Touma despite being younger than him.