Deneb is an Imagin fully contracted to Yuto Sakurai, gaining a physical form within normal spacetime due to Sakurai's wish for the Imagin to aid his past self as part of their contract. Rather than possessing him to travel into the past, Deneb willingly betrays Kai and possesses Sakurai in the middle of a fight after witnessing his desire to protect time as Zeronos. Deneb serves as Yuto's butler and fights alongside him while he is in Altair Form, able to shoot bullets (or smoke pellets) out of his fingertips. He also provides Zeronos the ability to transform into Vega form. He carries around a basket that contains hand-made candies that have wrappers that bear his face called "Deneb Candy". His personality is the polar opposite of Yuto's, with Deneb's noble demeanor usually resulting in embarrassing consequences done to Yuto, who comically beats him up for it. Although Yuto treats him with occasional disrespect; Deneb chooses to stand by his side out of friendship and loyalty, knowing Yuto to be a kind person. He also acts as a parental figure to Yuto, doing his best to make sure he lives healthy, including a need to serve shiitake to him, despite Yuto's deep hatred towards it (and usually resulting in a comical beating). Due to the fact he has a physical form in normal spacetime, Deneb often appears in (poorly constructed) disguises in order to avoid standing out. Due to Deneb's limited interaction with the Tarous, he does not have names for them. However, he has on one occasion called Kintaros "Kumagoro" and Urataros as "Kametaros". Deneb is also the only Imagin other than Ryutaros to call Momotaros by his actual name as opposed to a nickname. Deneb is also the only main Imagin who does not have his own catchphrase, although merchandise from Toei and Bandai often feature Deneb saying "Please take care of Yuto". Upon transforming into Vega Form, Deneb often starts out with "Let me tell you this for starters...", followed by something honest. The first instance was "This face on my chest is only a decoration!". Deneb's physical form is based on the historical story of Benkei and the fictional Karasu-Tengu. He is also named after the star Deneb in the constellation Cygnus the Swan which is important in the legend of the Tanabata along with "Altair" and "Vega", the names of the two forms that Zeronos can initially access.
Ansem the Wise was a famous scientist and sage-king of Radiant Garden. To protect his people from the darkness, he and his apprentices performed research and experiments to study the heart, which resulted in the creation of the Heartless. Eventually, Ansem's apprentices were taken over by the darkness, and, when he decided to end the research, they banished him to the Realm of Darkness and Xehanort continued the research in his name.
Urataros (ウラタãƒã‚¹ Uratarosu) is the second Imagin that gives Ryotaro his power, allowing transformation into Den-O Rod Form. The form given to him by Ryotaro is turtle-like in appearance, with his weapon being the Uratarod (ウラタãƒãƒƒãƒ‰ Urataroddo), a rod with hexagonal blades at each end. Furthermore, Urataros was well-aware of Ryotaro being a Singularity Point, making his contract to him on purpose—though he says it is to evade the loneliness of being outside time, Hana later debunks this entirely. When he possesses Ryotaro, he usually states the words, "Hey, will you let me fish you?" (ã�Šå‰�ã€�僕ã�«é‡£ã‚‰ã‚Œã�¦ã�¿ã‚‹ï¼Ÿ Omae, boku ni tsuraretemiru??).He is also aware of the evil Imagin planning to destroy time, but simply does not want to commit it as in spite of his cool exterior, there's indication that he's somewhat of a coward and lies just for self preservation. Urataros is a casanova with a very convincing personality, owning the ability to convince almost anyone by speaking to them, with Ryotaro the only one who trusts him and lets him stay as he sees he has a good heart. Urataros, however, later says that he lies simply for the sake of lying ("One lie is more interesting than a thousand truths"), and seems quite irritated that Ryotaro is "trivializing his lies." While Momotaros gets Ryotaro in trouble through reckless methods, Urataros puts Ryotaro in conflicting situations when he goes around wooing multiple women. Despite these negative traits, along with his occasional fights with Momotaros, Urataros does show genuine concern for Ryotaro's well being the best speaker of the Taros, possessing Ryotaro simply to get information out of someone, or to talk his way out of something. He is also useful in situations that require patience, something Momotaros severely lacks. He usually refers to Momotaros as "Sempai" (先輩 Senpai?) and Kintaros as either "Bear" (クマ Kuma?) or "Kin-chan" (ã‚ンã�¡ã‚ƒã‚“ Kin-chan?) respectively. Urataros' physical form based on that of a turtle and fishing rods are a common motif, both of which are aspects of the myth of Urashima TarÅ� (浦島太郎?), a fisherman who caught a turtle that led him to the castle of RyÅ«jin.
Sieg is an Imagin who enables Den-O's transformation into Wing Form. He arrives in the current timeline six months prior to Ryotaro becoming Den-O, originally intending to forge a contract with a young wealthy pregnant woman named Shiori Takayama, but possesses her unborn son in the process. After the child is born and subsequently kidnapped, Sieg comes into being and seeks to reunite his "brother" with their "mother", crossing paths with Ryutaros and gaining access to the DenLiner. Due to his "privileged" upbringing and his already princely mannerisms, Sieg becomes easily infuriated when treated with disrespect. Because he is "born" in 2007, he also possesses extraordinary unique abilities. Aside from shrinking the TarÅ�s to 4 inches tall with the phrase "Kneel down to me!" (é ã�Œé«˜ã�„! Zu ga takai!),he also cannot be forcibly removed from Ryotaro's body as he does not need a contract to possess humans. When possessing Ryotaro, Sieg says "Descending, yet above it all…" (é™�臨ã€�満をæŒ�ã�—ã�¦… KÅ�rin, man o jishite…). He almost vanishes due to his contract holder being a newborn child and unable to form proper memories, but Ryotaro is able to discover that Sieg actually made a contract with the mother to ensure her then unborn son's safety, saving Sieg's life in the process. As his contract has been fulfilled, the DenLiner takes Sieg to the date of his Shiori's greatest memory and lives in the past freely. After his appearances in the television series, he appears in the films Kamen Rider Den-O: I'm Born! and Saraba Kamen Rider Den-O: Final Countdown allowing for the transformation into Wing Form, and again in Cho Kamen Rider Den-O & Decade Neo Generations: The Onigashima Warship, pestering Tsukasa's group until brought to the climatic battle to join the TarÅ�s in forming Super Climax Form. He also appeared in Cho-Den-O Trilogy Episode Blue: The Dispatched Imagin is Newtral. During his first time on the DenLiner, he demanded that the others call him "Prince" (プリンス Purinsu?) and asked for Hana to be his "Princess" (å§« Hime?), and was punched for each time he called her that. After his return, Sieg refers to the TarÅ�s as his "family" instead of his "friend" phrasing. In the Imagin Anime OVA, Sieg had an additional power "Super-Ultra Kneel down to me!" (スーパーウルトラé ã�Œé«˜ã�„! SÅ«pÄ�-Urutora Zu ga takai!?) that allows him to shrink everything in sight, even an entire planet. His name is given as "Zieg" in the series' photobook DETAIL OF HEROES: Masked Rider Den-O Exclusive Photograph Collection: IMAGINE (DETAIL OF HEROES ä»®é�¢ãƒ©ã‚¤ãƒ€ãƒ¼é›»çŽ‹ç‰¹å†™å†™çœŸé›† IMAGINE DETAIL OF HEROES Kamen RaidÄ� Den'Å� Tokusha ShashinshÅ«: Imajin?), however, other materials give his name as "Sieg," such as the earlier photobook Masked Rider Den-O Photobook: IMAGIN (ä»®é�¢ãƒ©ã‚¤ãƒ€ãƒ¼é›»çŽ‹ãƒ•ã‚©ãƒˆãƒ–ãƒƒã‚¯ IMAGIN Kamen RaidÄ� Den'Å� Fotobukku Imajin?). Sieg's physical form and name are based on swan and Prince Siegfried (ジークフリート王å� JÄ«kufurÄ«to ÅŒji?) from the story Swan Lake (白鳥ã�®æ¹– HakuchÅ� no Mizuumi?).
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.
Kintaros is the physically strongest of the Imagin that are linked to Ryotaro and speaks Kansai-ben. He originally possessed a man named Masaru Honj�, but joins Ryotaro when Den-O is unable to defeat the Rhino Imagin. He is mostly found sleeping on the DenLiner, but will possess Ryotaro whenever he hears someone say anything resembling "cry" (泣�る� nakeru de). As Den-O, he lives up to his namesake and fights with an axe as Axe Form, has primary control of the left arm in Climax Form, and his power is tapped in the DenKamen Sword's KinAx mode.