Kurumi is a young woman who is an itinerant martial artist along with her older sister, Natsume. For years the two wandered Japan in search of their long-lost father, Soun Tendo. They briefly usurped Akane Tendo and Ranma Saotome’s claim to inherit the Tendo Dojo and carry on Anything Goes Martial Arts after challenging and defeating them, but conceded their claim following a rematch. Both sisters are the only characters to appear in the OVAs who did not originally appear in the manga. (Source: Ranma Wikia)
Ikuno Komaki is Manaka's little sister who has a chronic illness that keeps her in the hospital. Prior to episode two of the OVA, her health improved and she was released, thus she was invited to the beach along with her sister. Ikuno is very supportive of her sister and she tries her best to support Manaka in her affection towards Takaki.
She was left for dead after the brutal murder of all members of her family, Henrietta is the newest addition to the Agency. She was assaulted repeatedly next to the dead bodies all night, which had inflicted psychological trauma to her, making her suicidal. Her struggle is the most developed of all the girls as she adjusts to her new life. Henrietta's favorite activity is to spend time with her handler, Jose`. Whenever Jose seems to turn his attention to other women (including the other cyborgs of the SWA), Henrietta becomes slightly jealous. This is due to Henrietta's strong romantic feelings for him, as a result of her faint conditioning and the care he gives her.
Age: 16-17 Ei Sei is the king of Qin who bears a striking resemblance to Shin's friend Hyou. His father was the late king, but his mother did not have any royal blood. Ei Sei seems level headed but somewhat cold. When Shin was going to let Jo Kan leave, Ei Sei kills the assassin without remorse. However, he does care at least a little bit about those loyal to him.
Teng is Wang Qi's aide and seems to be an army man himself. He is the only one who actually has any idea what Wang Qi's plans are.
A merchant who ranked up as Qin's Right Chancellor. Shortly after he is introduced, it is revealed that he is planning to keep his army in Wei until Ei Sei dies, then storm Qin's capital of Xianyang, denouncing Seikyo as a tyrant and taking the throne for himself.