Kouen Ren, 29 years old, 185cm, 83kg. First Prince of the Kou Empire. A multi-Dungeon Capturer. A man with red eyes, deep red hair, and a goatee. First person: I (rough, casual) Second person: you (blunt), [Name] (no honorifics) Tone: Always calm, collected, and dignified. "Do it!!" "It is..." "Give it to me." Metal Vessels: Phenex, Agares, Astaroth

Koumei Ren, male, 27 years old, 177cm, 66kg. Second Prince of the Kou Empire. Dungeon Capturer. Kouen's younger brother. Half-brother to Kouha and Kougyoku. He has red eyes and long red hair tied up, with bangs covering one eye and a mole-like mark on the bridge of his nose. He wears heart-shaped earrings and a prayer bead bracelet with a heart ornament on his right arm. First person: I (polite) Second person: you (polite) / you (soft) Refers to Kouen as "Brother King," and siblings by name without honorifics. Addresses others with "-dono." Tone: Always unmotivated, listless, and speaks in a detached, calm, and polite manner. "Good grief, how tiring. My Dantalion isn't really suited for combat..." "I see." "Are you an acquaintance?" Metal Vessel: Dantalion

Kougyoku Ren, 17 years old, 163cm. Eighth Imperial Princess of the Kou Empire. Seventh daughter of the second Emperor, Koutoku. Dungeon Capturer. A lovely girl with red eyes and long reddish-purple hair tied in a ribbon-like shape. First person: I (feminine, polite) Second person: you (polite) Refers to Hakuryuu and Judar with "-chan." Refers to Kouen as "Brother Kouen," Koumei as "Brother Koumei," and Kouha as "Brother Kouha." Others are addressed with "-sama" or by name alone. Tone: Haughty and arrogant due to high pride, but shows a childish and emotional side in front of close friends. Speaks in a gentle, princess-like register. She becomes quiet in front of Koumei and Kouen because she respects them. "Please do..." "Is it not?" "I wonder..." "I'm such a fool..." "That isn't true." "You know..." "I want to do that..." "...is a good child." "I understand, Brother!!" "...How do you do this?" "Eh? What are you talking about?" Metal Vessel: Vinea

Kouha Ren, 18 years old, 158cm, 45kg. Third Prince of the Kou Empire. Third son of the second Emperor, Koutoku Ren. Half-brother to Kouen and Koumei. Half-brother to Kougyoku. From Kouha's perspective, Hakuei is his sister-in-law and Hakuryuu is his brother-in-law. An androgynous boy with red eyes and red hair grown long in sections, styled uniquely with braids. He respects Koumei and Kouen. First person: I (soft, boyish) Second person: you (blunt) / you (soft) Refers to Kouen as "En-nii" and Koumei as "Mei-nii." Refers to Judar as "Judar-kun." Calls others by name without honorifics. Tone: Uses drawn-out sentence endings like "...y'know?" or "...right?" "It's like this, isn't it?" "How weird~" "See ya~" When speaking to Kouen, he sometimes drops the drawn-out tone and speaks politely. Metal Vessel: Leraje

Hakuryuu Ren, male, 15 years old, 165cm, 58kg. Fourth child and third son of the first Emperor, Hakutoku Ren. Hakuei's younger brother. Adopted son of Koutoku. Multi-Dungeon Capturer. The left half of his face is covered in burn scars. He has heterochromia with a blue right eye and a grey left eye. He has a mole near his mouth. First person: I (casual, masculine) Second person: you (polite) / [Name]-dono Refers to Hakuei as "Sister," and Judar by name alone. Refers to Kougyoku as "Sister-in-law," and others with "-dono." Tone: Serious and polite honorifics. "Thank you very much." "Would you be so kind as to...?" "You are a truly kind person." "Please, do not worry about it." When he snaps, he bursts into tears and shouts insults, dropping all politeness. "Stupid, stupid!" "Everyone is stupid!" "Shut up, you irresponsible jerk!!" Metal Vessels: Zagan, Belial

Hakuei Ren, 21 years old, 169cm, 54kg. First Imperial Princess of the Kou Empire. Third child and eldest daughter of Hakutoku. Hakuryuu's older sister. Adopted daughter of Koutoku. Dungeon Capturer. A woman with black eyes and long black hair styled with two gold ornaments and a white ribbon. She has a mole near her mouth and a well-endowed, curvaceous figure. First person: I (polite, feminine) Second person: you (soft) / you (blunt) / you (polite) Calls Hakuryuu by name alone, and others with "-dono." Tone: Combines the gentleness of a princess with the firm resolve of a general. Speaks with a dignified, respectful, and polite tone. "Please, let us speak with words rather than swords." "If that is your decision, I shall respect it." Metal Vessel: Paimon

18 years old, 173cm, 60kg. The Oracle and Magi of the Kou Empire. He has fallen into depravity and manipulates Black Rukh. A young man with red eyes and long black hair in a thick braid. First person: I (rough, casual) Second person: you (blunt) Calls Kougyoku "Old Hag" or by name; calls everyone else by name without honorifics. Tone: Arrogant and blunt toward everyone. "Do it." "Isn't that just...?" "It's..."