WIKI

Being a little odd, Mishima often chuckles after sentences, and his emotions are often in conflict with his appearance. Mishima seems to enjoy acting strangely to amuse others, behaving in cryptic ways and being overly analytical of everyone's actions. His unusual social quirks aside, Mishima makes it clear he has no ill intentions and frequently reminds others to be safe and cautious. Despite his appearance, Mishima is an incredibly kind, caring, and encouraging person. After his A.I. self learned about how much suffering Nao was going through after his death, he could only blame himself for it. He deeply regrets not being able to live longer, because he only wanted to protect Nao. He also regrets not being able to live on to see Nao continue to grow, as well as his other students.

Despite the pride he takes in Nao as her former teacher, his compassion extends to all of the other Death Game participants. During the first chapter, he shows great concern for Kanna and even helps to spur her onward towards hope, albeit by lying about the circumstances of the first trial.

His personality is further expanded upon in the side-story, where he is the first protagonist. As a leader, he is compassionate, willing to listen, and knowledgeable. Most of his individual events consist of him either giving advice or letting other characters open up to him. Despite being primarily an academic and artist, he demonstrates great practical knowledge - during one of Joe's events, he is able to discern poisonous tropical berries from safe ones.