Horobi is a major antagonist in the tokusatsu series Kamen Rider Zero-One. As the leader of MetsubouJinrai.net, Horobi is a Humagear who seeks to bring about the extinction of humanity, believing that artificial intelligence should surpass its creators. Ruthless yet composed, he commands other rogue Humagears and serves as Kamen Rider Horobi, utilizing the power of the Sting Scorpion Progrise Key. Over time, his ideology and motivations become more complex, challenging both himself and the protagonist, Aruto Hiden.