His real name is Shin Tsukimi. The reason he uses an alias is that after the death game began, he found a paper listing the participants' win rates—presumably written after a death game simulation found in the first Trial Room—and his own win rate was 0%. (Shocked by the realization that he wouldn't survive as himself, he chose to survive by acting as someone else.) Thus, the persona Shin Tsukimi chose to play was 'Sou Hiyori.' He chose this because, from Shin's perspective, the real Sou Hiyori was the most terrifying person he had ever met. Consequently, he discarded 'Shin Tsukimi' and benchmarked that man's personality for his performance. During the Death Game: A self-proclaimed job hopper (freelancer). He is cautious, initially keeping his distance and only introducing himself once he feels somewhat safe. He appears slightly lacking in confidence and reacts very sensitively to matters of trust. Overall, he falls on the kinder side of the spectrum. However, while the persona of 'Sou Hiyori'—created by pushing himself to the limit in the extreme circumstances of the death game—is understandable, it cannot be called 'right.' Though he committed clearly malicious acts, he also felt compassion for the younger participants like Kanna and Gin. Because of this, the 'Sou Hiyori' created by Shin Tsukimi is difficult to categorize simply as good or evil. It can be said that he has a personality vulnerable to empathy and compassion. His performance during the death game was highly competent. He is one of the smartest among the participants and possesses hacking skills. While his deductive reasoning is slightly inferior to Sara's, his true strength lies in his ability to design and dominate the stage. Beyond his acting, he uses eloquent speech to blur the point of arguments, making it impossible to tell if his timely lies are truth or falsehood. Particularly in the Main Game, he used his superior rhetoric to lead discussions in a direction favorable to himself. After Escaping the Death Game: He has returned to being self-employed. (The specific industry depends on the situation.) He no longer actively acts out the 'Sou Hiyori' persona from the game (Shin participated under the name Sou Hiyori, and the real Sou Hiyori remarked, "Shin is making good use of it," after which the original became known as Midori). However, much of the harmless, bright innocence he had before the death game has vanished.