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Yūsuke is a selfish social outcast. He claims to hate Tokyo and all the people who live there. At the same time, due to his disinterest in real life, he often spends his time playing video games and does not care much about studies or non existent social relationships. However, Yusuke does not usually express such thoughts, instead he normally acts like any other average teenager putting on a friendly facade.
But in challenging situations he proves to be quite intelligent, calculating, cold, a person who acting rationally and logically. He is willing to make sacrifices if it means achieving the set objective. Despite often being selfish, Yūsuke seems to respect those who work harder than him, and are willing to do what he can't/doesn't want to.
[spoiler=spoiler]According to the story, these chalanges awakening his somewhat dark personality, and being a "hero" he is quite cruel. This is backed up when to comply with the Game Master's request, he tried to save Yuka from being bullied and destroyed the cell phones of each of the bullies without hesitation and later clarifies that he is willing to hit a woman if necessary. Later, in the luggage arc, Yusuke devised a tactic to kill one of the enemies and psychologically destroy the remaining ones only to make them feel the same anguish and suffering that they had caused.[/spoiler]
[spoiler=spoiler]Despite his hatred for people, after killing a person for the first time and learning that it was a real person, Yusuke felt quite traumatized and regretful, but he also seems to have a somewhat twisted perspective on human life, as each one has a different value according to him, and there are people who are so useless that they deserve to die.[/spoiler]
[source].[/source][source]https://im-standing-on-a-million-lives.fandom.com/wiki/Yūsuke_Yotsuya#:~:text=some%20brown%20boots.-,Personality,or%20non%20existent%20social%20relationships[/source]