Yusuke Fujiwara (藤原 優介, Fujiwara Yūsuke?) is a mysterious new student attending Duel Academy. Jaden later discovers from Atticus Rhodes that Yusuke was a student with him and Zane Truesdale several years earlier, but vanished in the abandoned dormitory. Atticus later remembers that Yusuke was the original host of Nightshroud, and bestowed Nightshroud's powers and spirit to him before he vanished. The Yusuke currently at Duel Academy is later revealed to be the duel spirit Honest, Yusuke's spirit partner who has been searching for him. Honest is later destroyed by Trueman when he sacrifices himself to help Jaden, but Jaden adds him to his deck and uses him in his third rematch against Trueman. The true Yusuke later returns to Duel Academy as the leader of Trueman's invasion, now the leader of the world of Darkness and endowed with its full power. He is challenged by Atticus to a duel after defeating virtually everyone at Duel Academy and defeats him sending him to the world of Darkness. Yusuke is then challenged to a three-way duel with Jaden and Jesse. He defeats Jesse, but Jaden summons Rainbow Neos to defeat him and exorcise Nightshroud from his body.
Yusuke plays a Clear deck. By using the field spell Clear World, Yusuke is able to activate a variety of debilitating effects depending on what attribute his opponent's monsters are, and avoid having to suffer such effects himself through the effect of Clear monsters that are not treated as having an attribute. It is unknown if this is his real deck, or only his deck while possessed. However, it seems that deck itself is a reflection of either of Yusuke's (Nightshroud's) beliefs - individuality brings suffering while nullification relieves it. Only two of the cards in his deck are available in the US the first being "Clear Vice Dragon" his trump monster and "Clear World" his most used card.
He sports a standard season 1-3 duel disk and he is first shown wearing an Obelisk Blue uniform with a single large triangle coat tail and large shoulders on the blazer. He is later shown wearing a costume similar to his old friend Atticus's Darkness clothing, but with a blue ribcage-like pattern on the under shirt. He also uses a mask similar to Atticus's, but Fujiwara's covers his entire face and emphasizes the points more than Atticus's. A piece of his mask breaks off during his duel with Atticus, and he removes the upper part of his mask, leaving only the jaw line of his mask on his face for the rest of the time he is the avatar of Darkness.
His main fear is being forgotten, which was caused by his parents death.
Read more about this topic: List Of Yu-Gi-Oh! GX Characters, Minor Characters, Season 4