Lead Rider of [[kamen_rider_den-o_(series)|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.