Ryoko Kaminagi is a key character in the anime series Zegapain. She is a cheerful and energetic high school student who is also the childhood friend of the protagonist, Kyo Sogoru. Ryoko has a passion for video recording and is often seen with her camera, capturing moments around her. As the series progresses, she plays a critical role in unraveling the mysteries surrounding the virtual world and the real world. Her character is pivotal in helping Kyo understand the truth about their existence and the nature of their reality, bringing emotional depth to the storyline.