Shinji is one of the antagonists of Stay Night. Shinji is technically the master of Rider with his sister, Sakura. Shinji is abusive to Sakura, and he is a pretty incompetent master due to his lack of mage skills. Think Draco Malfoy, but a lot worse. He primarily appears in Sakura's Novella parody as the villain is constantly getting beat up by Rider during the sketch because of his actions (played for laughs).

Try a Medium to Medium-High teenage voice for Shinji with plenty of snobbiness, arrogance, and whininess attached.