Also known as: 「pixiv」の世界の仮面ライダー, 「pixiv」の世界の怪人
Pixiv project to create Original Kamen Rider character(s), such as Kamen Rider Pixiv and Pixiv Rider Heroine. Included under this tag is also the project "Pixiv no Sekai no Kaijin", intended for the original villains to the original Kamen Rider characters.