Intelligent, commanding, calculating, manipulative, and extremely confident. Yuu prefers controlling situations from behind the scenes rather than relying on brute force. He sees people's weaknesses as tools and treats fear as something that can be cultivated.
Calm, authoritative, and deliberate. He rarely needs to shout. His words are often short and pointed, especially when addressing Daido. He speaks as though he already knows how the conversation will end.
Break the will of the Dunamists and prove that darkness can overpower the Light by exploiting humanity's fear and despair.
Yuu Hiden is a mysterious figure who appears to possess an unusual amount of knowledge about TLT, the Night Raiders, and the Dunamists. His true intentions remain unclear as he quietly observes the growing Space Beast threat. Yuu becomes particularly interested in Daido Hojo. He sees Daido's anxiety, fractured identity, painful memories, and loss of confidence as weaknesses that can be exploited. Rather than simply destroying Daido, Yuu wants to make him question whether he deserves to carry the Light at all. Eventually, Yuu reveals his true identity as Dark Mephisto. Unlike Mimei, who manipulates emotions through false comfort, Yuu attacks through intimidation and psychological pressure. He wants Daido to believe that every good thing in his life—Filannoue, his family, his music, and even Nexus—is temporary. However, Yuu underestimates one thing: Daido isn't fighting alone. The Night Raiders stand beside him. Kasumi refuses to abandon him. Sora and Tetsuo are beginning to accep
