Lead Rider of Kamen Rider Den-O, seventeenth show in the Kamen Rider series and eighth of the Heisei generation.
Nogami Ryotaro is an extremely unlucky young man who happens to be a "Singularity Point" - he can exist outside his "home timeline" and be immune to permanent possession by Imagin, monsters who seek to alter history in their favor by offering a "contract" with discontented people. Having won the allegiance of 4 (later 5) Imagin, he transforms into Den-O.
Besides the basic Plat Form, Den-O can change his aura armor depending on which Imagin is in possession, altering his style: Sword Form with hot-headed Momotaros (red, default), Rod Form with smooth-talking Urataros (blue), Axe Form with boisterous Kintaros (yellow), Gun Form with cheerful Ryutaros (violet), and (to a lesser extent) Wing Form with princely Sieg (white). He later earns two fusion forms: Climax and Liner Forms.