Utsuru Sanada is a professional photographer at the age of 17, he can guess the exact 3 sizes of any girl, he can memorize anything he sees, and he can counterattack karate moves (Most guys would want these abilities). Why? Because he has superb photographic memory called “Shutter Eye” (Shutter as in the shutter of a camera). He meets Niko Kurihara, the female protagonist, who dislikes men, is a master of martial arts, and is of course beautiful. As the story progresses, Niko at first thought he is an impure guy, but soon realizes he is unpredictable and not what he seems in her eyes. . .
Natsume is a young woman who is an itinerant martial artist along with her younger sister, Kurumi. 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)
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.
Bohemian Girl who appeared in episode 4.5 (Special).
Male, Human Age: 19 Lozo is recognized as the best sniper in Shark squadron. One can always find Lozo alone by himself, somewhere away from the crowd, as if he is concerned about nothing around him. It is not surprising why some call him lone ranger. (Source: Nanocore Tumblr)