Ryoji Mishima was a Yamatian officer stationed in Remonton during the Great War. He grew disgusted with the way Hideyoshi Ofuchi treated the captive Leon Alcibiates. Ryoji eventually helped Leon escape and escorted him to the army of the Grand Alliance. He became the representative of the Yamatian defectors after the First Battle of Remonton and decided to accompany Leon to the White Seal. Ryoji's current fate is unknown.