Chikuma Koshirō (Japanese: 筑摩 小四郎, hiragana: ちくま こしろう, rōmaji: Chikuma Koshirou) a major character featured in the Japanese anime Basilisk Kouga Ninpou Chou (known in English as Kouga Ninja Scrolls). Although his standing within the Iga's hierarchy was that of a mere gennin (a ninja footsoldier), Koshirou's prodigious talent was enough for his leader Ogen to include him among the ten elite warriors chosen to represent their clan of Iga Tsubagakure against the elite ten of the rival Kouga Manjidani clan.