Otoya Kurenai

For alternate version of Otoya Kurenai that appeared in Kamen Rider Decade, see Otoya Kurenai (A.R. World)

Otoya Kurenai (紅 音也,, Kurenai Otoya) is the main Kamen Rider Ixa from the year 1986 and only human to transform into Kamen Rider Dark Kiva, at the expense of his own life, in an attempt to stop the King.

Fictional Character Biography
Otoya Kurenai is Wataru's father who battles the Fangire menace in 1986, his ideology that "All humans are music" his reason of fighting Fangires was to protect that music. Otoya is a ladies man who retires from being a professional violinist for reasons unknown. It is by accident that he interferes in Yuri's mission and is eventually brought into their group as a result. Though normally a casanova, Otoya is vexed on anything marriage related, things always staying the same, and others getting in his way. He was the first to learn Jiro is actually a Wolfen, although no one believes him until later when Jiro threatened Yuri and reveals himself. He then becomes the second user of the Ixa System when Jiro was exposed, putting up a front of not suffering the suit's side effects. He is also capable of reasoning with Fangires who are not truly evil, he befriending Ōmura/Frog Fangire as he convinces him not to harm others. During his battle with the Fangire Race, Otoya falls in love with Maya, the original Queen of the Checkmate Four, resulting in the chain of events that led to him becoming the second Dark Kiva after forming a pact with Kivat-bat the 2nd to take on the Fangires' King. Otoya, with help from a time-traveling Wataru, succeeds in destroying the King at the cost of being on the verge of death due to the strain of wielding Kiva's power. Otoya would then pay final visits to Yuri and the Arms Monsters before finally dying in Maya's arms after playing her favorite song. He would leave behind the Bloody Rose, a violin that Otoya himself made with Maya's help, for Wataru.

However, in a strange turn of events in 2008, Otoya's spirit makes his appearance when he suddenly finds himself in Wataru's body. During that time, he recognized Megumi and Kivat as the children of those from his time. He also starts building a new violin with Wataru unaware that his father is building it through him. He would appear to Wataru in spirit one final time, encouraging his son not to give up as he lives on through him. In the non-canon The Queen of the Castle in the Demon World net spin-off movies, Otoya is brought into the present and bought the Café mald'amour, renaming it the "Café ore'amour" and attempting to remodel it.

Ixa Belt
The Ixa Belt (イクサベルト, Ikusa Beruto?) is a necessary piece of equipment for the Ixa Rider System. In conjunction with the Ixa Knuckle, the Belt lets the user transform to Ixa. The belt's change announcement is "Fist On" (フィストオン, Fisuto On?). It also stores the Fuestles designed for the Ixa Rider System. Unlike Kiva, the ones who become Ixa are seen to manually put the belt on themselves. The way a user wears the belt varies; Jiro tends to wear it with the Fueslots attached while Otoya wore it on his first two occasions (against Jiro) without them. Every other time after that, Otoya had the Fueslots attached.

Ixa Knuckle
Ixa also has an item called the Ixa Knuckle (イクサナックル, Ikusa Nakkuru?) that serves as his transformation device and becomes the Broken Fang (ブロウクン・ファング, Burōkun Fangu?) with the use of the Knuckle Fuestle (ナックルフエッスル, Nakkuru Fuessuru?), where the Ixa Knuckle charges up and releases a spreading burst of heat energy on the target, leaving the Fangire in the fragile state without the Knuckle coming in contact with the target. This burst of energy can also take the form of a sphere that flies into the target. When used without the Knuckle Fuestle, even while not transformed into Ixa, the user can use a much weaker but still effective version of the Broken Fang. When the user pushes the knuckle into another part of their body (typically the other hand, although Kengo used it against his boot), it announces "Ready" (レディー, Redī?). Unlike most devices with electronic voices in the franchise, the Ixa Knuckle says its phrases one character/syllable at a time. In the 2008 storyline, it undergoes an upgrade from Ver.X to Ver.XI.

Capacities Ver.I
 * Hard-Disk Space: 50GB
 * Virtual Memory: 10MB
 * Operating System: IXA-OS-PLT-01
 * Mother Board: IXA-00086
 * CPU: 80MHz/HI-BRAIN-X

Fuestles
Ixa version I only has access to one fuestle.
 * Knuckle Fuestle (ナックルフエッスル, Nakkuru Fuessuru?): This powers up the Ixa Knuckle to become the Broken Fang. When activated, the Ixa Belt announces "Ixa Knuckle - Rise Up" (イクサナックル・ライズアップ, Ikusa Nakkuru Raizu Appu?) prior to the execution of the Broken Fang finisher, primarily used in 1986.

Ixalion

 * Length: 2030 mm
 * Width: 720 mm
 * Height: 1120 mm
 * Curb weight: 172 kg
 * Top speed: 753 km/h (0 to 400m/s in 2.1s)
 * Maximum output: 477.75kw/21000rpm

The Ixalion (イクサリオン, Ikusarion?) is Ixa's motorcycle, a MotoGP style bike, dubbed as the "Stallion" to his White Knight motif. The Ixalion is a modified Honda CBR1000RR.