His name in the manga adaption is Seta Souji. In the anime it was changed to Narukami Yuu.
Narukami Yu is the quiet teenager who moves to Inaba to live with his uncle and cousin while his parents are away on an overseas work. He attends Yasogami High School where he meets his newfound friends, Yosuke Hanamura and Chie Satonaka. Yu is for the most part depicted as quiet, polite and calm person all throughout the story. Initially, he seemed emotionless and cold at times even to the point of calling him as a “deadpan”. However, throughout the series, Yu eventually shown to value his friends and the bonds of friendship he has made. In fact, he would even go through great lengths to save his friends no matter what it took. His initial persona is Izanagi, a swordsman wearing a black coat. It was also revealed later in the show that Yu also possessed the mysteriously unique “Wild Card” ability, which allows him to swap Personas during battle. Every bond Yu makes, he gains a respective Persona. His arcana is The Fool.