He is extremely amoral in his methods, noted to use any and all means available to successfully complete his mission. He shows no loyalty to others as he is willing to use any "teammate" he is working with as bait or as a tool to get himself any advantage if possible, even if means endanger them greatly. He is, however, not above saving them if it proves too dangerous, after they served their purpose. He is very dishonest and manipulative, constantly using lies and traps to deceive his enemies.

One of his most noticeable traits is his loathing for over-dependence on AIs, stemming largely from the accident that ruined his life. Ultimately, he only sees them as a tool for humans to exploit and otherwise disposable. Kengo projects his intense hatred towards AIs into the Ignis, which he became obsessed with destroying.
~!Despite his ruthlessness, Kengo displays a soft side for his younger half-sister, Emma, as seen when he saved her during the bounty hunter mission and when he decided not to erase her LINK VRAINS account after defeating her. He also showed a bit of sympathy towards his late father by bringing flowers for his grave!~
As noted by Varis, Kengo displays a strong pride in being a bounty hunter and acting on his own, sometimes to the point of stubborness. Varis described Kengo as "A lone wolf" because of this

The sixth anime series in the Yu-Gi-Oh! franchise. VRAINS is an acronym for "Virtual Reality Artificial Intelligence Network System".
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In futuristic Den City, people duel using digital cards in the VR space "LINK VRAINS" managed by SOL Technology, Inc. A mysterious organization known as the Knights of Hanoi hacks into LINK VRAINS in search of a runaway AI program, Ignis. One duelist with the username "Playmaker" stands against this threat. His true identity is high school student Yuusaku Fujiki, a skilled hacker with a dark past and a grudge against Hanoi. When he becomes the first to capture Ignis, a struggle between Yuusaku, SOL Technology, and the Knights of Hanoi ensues.<br>
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(Written by Edo)

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Kengo Doujun