Akito, Agito, and Lind Wanijima are the collective, three distinctive personalities inhabiting one body. The son of Kaito Wanijima and Gazelle, he currently occupies the position of Fang King and is a member of Kogarasumaru. Agito is very bold, crazy and can be considered a sadist, though Agito would continue to preside as the body's dominant personality. Agito is nicknamed "Shark" by his teammates within , because of his attacks and crazy personality, though Ikki refers to him as "Little Shark".The youngest and dominant persona, Agito was created by Akito to cope with the mental stress created by his pacifistnature and responsibilities as Fang King. As such, his strength is derived from his desire to protect Akito. His devotion to Akito is shown through his sadistic/wild behavior, we can see this in his match against Udou, where he almost sacrifices himself.

Yuno Gasai is the main female protagonist of Future Diary series. She is the Second in the Survival Game and she is the owner of the "Yukiteru Diary/ Diary of future love".Yuno's personality is ambiguous. For the most part she is a sweet, feminine, and sometimes shy girl when around Yukiteru. But, this masks her dark and sanguinary side a ruthless, cold and calculating psychopath who has little, if any, problem in using others for her ends: her and Yukiteru's survival. She will resort to cruel and usually violent methods, most of the time coming out of nowhere, that generally end in bloody deaths, of either the Diary Holder or any respective follower, effectively making her a Yandere. Her brutal personality mostly results from abuse inflicted by her mother and the absence of her father, which finally ended with their deaths. This was the beginning of her changes, as she later became quite lonely and sorrowful. This is shown in her somewhat morbid habits of talking to her parents' dead bodies.