Ryoma is voiced by Kyle Hebert

Kaito has gel-spiked purple hair that's grown out both at the top and bottom of his head, that Kodaka describes as a space jet coming out of a black hole and a short goatee. His eyes are a warm lilac. He also has a slightly tanned complexion.

Kaito is an energetic person with a passionate heart, who lives for dreams and romance, and tends to give somewhat dramatic encouraging speeches for others. He believes you need to take risks for the sake of your dreams and should't limit yourself nor ever give up. Due to his clichéd hot-blooded spirit and his document falsification he could pass the astronaut examination, proving that he is smart. Being the Ultimate Astronaut, he harbors a dream and a great longing to go to space, and already considers himself a space legend. He often refers to himself as "The Luminary of the Stars" and talks about the Universe being on his side. Furthermore, he talks about being popular with women and children, and he thinks that his goatee gives him a "glamorous celebrity vibe".

Throughout the game, Kaito described himself as a passionate protagonist of his own story who would help the others to survive the killing game. He considers himself a hero type, and occasionally offers to make other people his "sidekicks". Because of that, Kaito always tries his best to unite the group, and he is very much a reliable older brother type of character. He is very loyal to his friends and always there in order to aid them, such as when Shuichi Saihara broke down after Kaede Akamatsu's death. He offered his help to regain his spirit by starting training routine during the nighttime and even made him his "sidekick". It is also because of this nature that he became a moral support to the other participants. According to Shuichi, Kaito has the ability to draw people to him, and he has been described as an interesting and amusing person. In his Free Time Events and Love Suite Event, Kaito shows interest in friendly or even romantic rivalry.