This paper toy is Kamen Rider Birth, the second Kamen Rider featured in Kamen Rider OOO with the identity used by several different people in the Kamen Rider Series, the papercraft is created by Azrael.
Chronologically the first user was Nobunaga who used it to battle one of the Pteranodon Yummy and later by Shintaro Goto. It first appeared in the series and to Kamen Rider OOO by Akira Date. The suit's name comes from the English word "birth" and his motifs are gashapon machines, a birthday cake, and a scorpion. Birth's first appearance is in Kamen Rider × Kamen Rider OOO & W Featuring Skull: Movie War Core as Nobunaga.
In the Kamen Rider OOO WONDERFUL: The Shogun and the 21 Core Medals, Eiji Hino temporarily used the Birth System to battle against Nue Yummy when most of his Core Medals were taken. [Source: wikia]