Cash Cow Franchise: Den-O has been living on well beyond the year-long expectancy of its fellow Rider series, and doesn't look to be dying anytime soon. Lampshaded in the opening Imagin skit in Farewell, Den-O.
"Well, for all the talk of 'Last' and 'Farewell', it's always common practice to make a sequel, isn't it?"
Fan Nickname: Thanks to the Egyptian-looking collar and other elements, Shiro is sometimes called Kamen Rider Phara-Oh.
Because of his skull and crossbones mask and resemblance to Gaoh, he's also sometimes known as Gaoh Pirate Form.
Tamaki Matsumoto has done voice overs for a few anime, including Code Geass (as Empress Tianzi).
Irony: The premise of the Cho Den-O trilogy: the films shine the spotlight on Zeronos, New Den-O and Diend, shoving Den-O himself in a supporting role instead. (Fans did complain about Den-O becoming a Cash Cow Franchise, after all...)