Ryotaro Nogami (野上 良太郎, Nogami Ryōtarō) is the main protagonist of Kamen Rider Den-O. He is a Singularity Point who journeys across the timeline as Kamen Rider Den-O (仮面ライダー電王デンオウ, Kamen Raidā Den'ō, Masked Rider Den-O) alongside the Taros onboard the DenLiner. He was temporarily possessed by the Ghost Imagin and forced to become Kamen Rider Yuuki (仮面ライダー幽汽, Kamen Raidā Yūki, Masked Rider Yuuki) Skull Form (スカルフォーム, Sukaru Fōmu).