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Rui is a calm, aloof, and somewhat polite person, rarely raising his voice. However, his low and guttural manner of speaking suggests suppressed anger and irritation. 2This attitude is due to Rui's transformation into a demon, which resulted in him being rejected by his human parents. Since then, the villain has been trying to create a new "loving" family to replace the one he lost. 4Rui's demonic abilities include powerful regenerative strength and speed. He is one of the fastest demons

He has a tattoo of Kanji-5 on his left eye, signifying his rank. 1 Demon Blood Technique allows him to create strong and very sharp threads, used both in attacks and in blocking enemy techniques. Age: 13 height 135 weight 30Rui is a quiet, aloof and somewhat polite person, rarely raising his voice. However, his low and guttural manner of speaking implies suppressed anger and irritation. 2 This attitude is due to Rui's transformation into a demon, which resulted in him being rejected by his human parents. Since then, the villain has been trying to create a new "loving" family to replace the one he lost. 4 Rui's demonic abilities include powerful regenerative strength and speed. He is one of the fastest demons, and can dodge Tanjiro's punches while dodging with his back. Rui also uses the threads he creates for attack and defense. 1 Rui is a calm, aloof, and somewhat polite person, rarely raising his voice. However, his low and guttural manner of speaking suggests suppressed anger and irritation. 2 This attitude is due to Rui's transformation into a demon, which resulted in him being rejected by his human parents. Since then, the villain has been trying to create a new "loving" family to replace the one he lost. 4 Rui's demonic abilities include powerful regenerative power and speed. He is one of the fastest demons and can dodge Tanjiro's strikes while dodging with his back. Rui also uses the threads he creates for attack and defense. 1 Demon Blood Technique allows him to create strong and very sharp threads that are used both offensively and in blocking enemy techniques. demon.