He's a ghost looking like a high schooler. He has almost no memory of his previous life (remembers only his own name), doesn't know how he died, when did it happen, who was his family etc. Usually he's friendly and cheerful, especially around Haram, but when left alone, he tends to drown in his thoughts. Actually, he's not a ghost, but a fragment of memory, and he did not die—his "real" self just wiped off some part of his memory because of a tragic event. That's when Gaon The Ghost was "born" and when the actual Gaon started to have partial amnesia, which changed a bit his personality, too.
A duel monster spirit of the card of the same name. She aids O'Brien in the alternate dimension, hoping he will be able to defeat the Supreme King as well.
A supporting character that shows Tomoya's jealousy of the their relationship of her child.
He doesn't seem to have a name but Kirihito once referred to him as "Man with a scar on the right side of his neck." He rapes and kills Tazu, and later tries to exploit Urabe and Izumi's fake engagement for profit.
He was the daimyo of the Land of This. The daimyo was an eating contest's viewer alongside his daughter and Shuu. He was in charge to give the prizes to the winners of the contest. During Akatsuki's invasion of his country, he was killed during Sasori's puppet assault. Anime Debut: Naruto Shippuuden Episode #309 (Source: Narutopedia)
A butcher who uses the disguise of a female so he can abduct women. Manga: A wanted serial killer and later an experiment in 5th laboratory. He falls in love with Riza when she was out grocery shopping in vol. 7. By that, he was caught by the military. He later helped Maria Ross escape from prison. In the original anime, he goes after Winry, but Edward eventually gets the best of him. He was seen arrested, but later reappeared as a soul bound to armor. "I kill, therefore I am." ~ Episode 21