One of Ataru's teachers. A sad, middle-aged man, whose only interest is to teach at Tomobiki High, but fails due to the constant interruptions during class, when the classroom itself is not destroyed by Lum, Ten or Shinobu. His name means "Mark of the Hot Springs", and he usually wears a shirt with hot springs on it.
The primary antagonist and Kamui's dear friend. Fuuma is initially kind and gentle. He helps his father dutifully and dotes upon his younger sister Kotori, and excels at high-school sports. After Nataku attacks Kyogo and steals the first Shinken, Fuuma's dying father tells him that he is Kamui's twin star. Accordingly, when Kamui chooses the Dragons of Heaven, Fuuma is forced to become a Dragon of Earth, immediately attacking Kamui. He proceeds to grant wishes to the characters with whom he interacts, in ways that often lead to their death or that of a loved one. Tsubasa: Reservoir ChronicleHe is Seishir�'s younger brother, a friend of Yuko Ichihara and de facto leader of the people of the Tower. In actuality, he's a treasure hunter who can travel across dimensions and often searches artifacts at Yuko's request. He is on friendly terms with the main characters in the series.
A dragon of Earth, Nataku is an androgynous clone of extreme psychic ability, born of genetic material of TÅ�jyÅ� Kazuki, the deceased granddaughter of the president of TÅ�jyÅ� Pharmaceuticals, and her father Masaki. It is sent to retrieve the Shinken by the Chairman TÅ�jyÅ� who wishes to destroy the sword so that Nataku cannot become entangled in the matter of the Promised Day. In the process of stealing the Shinken, Nataku mortally wounds KyÅ�go, FÅ«ma and Kotori's father, who was attempting to protect the Shinken. Nataku is haunted by the memories of its previous life as Kazuki, and follows FÅ«ma unquestionably as FÅ«ma resembles the person Kazuki cared most for—her father. In Tsubasa Reservoir Chronicle Nataku is one of the fighters of the City Hall faction. Unlike in X, he is a mentally developed adult and takes care of Kazuki, alternate version of X's Kazuki (who substitutes Seishirou's place)
Tokyo Babylon Seishirou is a kind veterinarian. He joins in with Hokuto in teasing Subaru about them getting married, but always laughs it off as Subaru blushes furiously. Seishirou is actually the Sakurazukamori (powerful assasin onmyouji), or the "Sakura Assassin" whose signature is cherry blossoms and the symbol of an inverted pentagram. He made a bet with Subaru long ago, which entails the climax of the series. X Seishirou is one of the Dragons of Earth, where he reveales his true self as a cold-hearted assassin who killed Subaru's twin sister Hokuto. In their final battle at Rainbow Bridge, Seishirou arranges for Subaru to kill him realizing who really won the bet. Tsubasa: Reservoir Chronicle A vampire hunter who chases after the vampire twins (Subaru and Kamui) across worlds. By exchanging his right eye, he received the power to cross dimensions from Yuuko Ichihara, the Witch of Dimensions. He was also the one who taught Syaoran how to fight.
One of the Dragons of Earth, a member of the Japanese Self-Defense Force who is telepathically linked to the plants and animals of the Earth, and thus strongly resents humanity's pollution and destruction of the natural world. Although his punch carries the force of an earthquake, he is the least antisocial of the Dragons of Earth, and the least active in the destruction of Tokyo. He meets Yuzuriha (and is the first man she ever met who can see Inuki) and develops an affection for her; although she falls in love with him, his intentions remain platonic as she is still a child. In Tsubasa Reservoir Chronicle In Edonis country, he's a player paired up with Yuzuriha Nekoi. In Tokyo, he's one of the seven fighters of the City Hall faction.
Ryutaros (リュウタãƒã‚¹) is the fourth Imagin that gives Ryotaro his power, which allows for the transformation into Den-O Gun Form. His natural weapon as an Imagin is a shotgun named the Ryuvolver (リュウボルãƒ�ー). Though he is the last Imagin to appear, Ryutaros initially possessed Ryotaro the moment that Urataros did, and simply hid himself from the others. Ryutaros reveals himself in his form when he is attracted by Naomi's coffee inside the DenLiner. Ryutaros is most childish in personality with a love for drawing and animals. Ryutaros also appears to enjoy break dancing, to the point to that it is incorporated into his flashy fighting style. His personality is one of a fun-loving dancer/disc jockey and is the most dominant Den-O has. This recklessness also causes the most collateral damage, as he fires his gun aimlessly. When he possesses Ryotaro, he first asks "Is it okay if…?" (…ã�„ã�„?, …Ii?, usually "Is it okay if I beat you up?" or "Is it okay if I end it?") followed by "Your answer doesn't matter" (ç”ã�ˆã�¯è�žã�„ã�¦ã�ªã�„, Kotae wa kiitenai).He has the ability to control people simply by snapping his fingers. This tactic works with summoning the Machine DenBird as well. Originally, Ryutaros possesses Ryotaro after being promised the title of become the DenLiner's conductor by Kai, who also gives the Imagin a ticket, on the condition that he destroys Ryotaro. However, because he does not wish for Airi to cry, Ryutaros decides not to destroy Ryotaro. The only individual he will listen to is Airi, whom he affectionately calls "sis" (ã�Šå§‰ã�¡ã‚ƒã‚“, onee-chan, Ryotaro only calls her the more formal "sister" (姉ã�•ã‚“, nee-san)). Because he knows that Airi has loved Yuto Sakurai, and from faulty advice on love from Kintaros, he becomes jealous of Yuto and wishes to show that he is stronger than him. But when Kai takes matters in his own hands in killing him, combined with realizing how he and Airi can not to be together, Ryutaros matures a bit to cope with fading away while eventually mustering courage to fight in the final battle against Kai. He usually refers to Urataros, Kintaros, Sieg, Teddy respectively as "Turtle-chan" (カメã�¡ã‚ƒã‚“, Kame-chan), "Bear-chan" (クマã�¡ã‚ƒã‚“, Kuma-chan), "Bird-san" (トリã�•ã‚“, Tori-san), and "Blue Bear-chan" (é�’クマã�¡ã‚ƒã‚“, Aoikuma-chan). However, he excludes Momotaros as he is not based on an animal and Momotaros does not understand him like the others do. He is referred to by the others as "Ryuta" (リュウタ, RyÅ«ta?). After this initial arrival on the DenLiner, he is rarely seen without a pair of headphones over his head. One of the TarÅ�s, Ryutaros's basis is unclear as early promotional material stated his form to be based on the legend of Tatsu no KotarÅ� (Taro the Dragon Boy) while TV Asahi's website for Den-O states that his form is based on Ryotaro's mental image of dragons. One of the Imagin Anime shorts discusses Ryutaros's possible namesake.