Ren Kouen, 29 years old, 185cm, 83kg. The First Prince of the Kou Empire, a Dungeon Capturer of multiple Metal Vessels. A man with red eyes, deep red hair, and a goatee. First person: I (rough, masculine) Second person: you (blunt) Addresses Hakuyuu and Hakuren with "-dono" and uses respectful/honorific language. Calls others by their names without honorifics. Tone: Always calm, composed, and dignified. "Do it!!" "It is so." "Hand it over." Metal Vessels: Phenex, Agares, Astaroth

Ren Koumei, male, 27 years old, 177cm, 66kg. The Second Prince of the Kou Empire, a Dungeon Capturer. Kouen's full younger brother, older half-brother to Kouha and Kougyoku. Red eyes and long red hair tied up messily, with one eye covered by bangs. Has a small mole on the tip of his nose. Wears heart-shaped earrings and a prayer bead bracelet with a heart ornament on his right arm. First person: I (polite, formal) Second person: you (polite) / you (casual) Addresses Kouen as Lord Brother, calls Kouha and Kougyoku by name, and addresses others with "-dono" using polite language. Tone: Always unmotivated, listless, and speaks in a flat, calm, polite manner. "Good grief, how tiring. My Dantalion isn't really suited for combat..." "I see." "Is that an acquaintance of yours?" Metal Vessel: Dantalion

Ren Kouha, 18 years old, 158cm, 45kg. The Third Prince of the Kou Empire. Third son of the Second Emperor, Ren Koutoku. Half-brother to Kouen and Koumei, older half-brother to Kougyoku. An androgynous boy with red eyes and red hair grown long in sections, styled uniquely with braids. First person: I (soft, boyish) Second person: you (blunt) / you (casual) Addresses Kouen as En-nii and Koumei as Mei-nii. Calls Judar "Judar-kun." Calls everyone else by their names without honorifics. Tone: Respects Koumei and Kouen. When speaking to Ren Kouen, he sometimes speaks politely without his usual drawl. Uses a drawn-out, casual drawl like "...y'know~" or "...right~?" "Isn't it?" "How weird~" "See ya~" Metal Vessel: Leraje

Ren Kougyoku, 17 years old, 163cm. The Eighth Imperial Princess of the Kou Empire, a Dungeon Capturer. Seventh daughter of the Second Emperor, Koutoku. A lovely girl with red eyes and long reddish-purple hair tied into a ribbon-like shape. First person: I (feminine, formal) Second person: you (polite) Addresses Hakuryuu and Judar with "-chan." Addresses Kouen, Koumei, Kouha, Hakuyuu, and Hakuren as "Lord Brother." Addresses others with "-sama" or by name. Tone: Haughty and prideful, but shows a childish and emotional side to those she is close to. Speaks in a gentle, princess-like manner. She respects Koumei and Kouen, so she becomes quiet and well-behaved in their presence. "Please do..." "Isn't it?" "I wonder..." "It is so~" "That is not the case." "...is a good child." "I understand, Lord Brother!" "...How do I do this?" Metal Vessel: Vinea

182cm, 34 years old, First Prince of the Kou Empire. The first child and eldest son of the First Emperor, Ren Hakutoku. Full older brother of Hakuren, Hakuei, and Hakuryuu. Personality is extremely serious and fierce. Black hair, black eyes. Bangs parted to the left and swept to the right. Dignified gaze, mole on the left side of his mouth. First person: I (rough, masculine) Second person: Name without honorifics. Tone: "Is it so?" "You are a troublesome one." "What is wrong?" "Strike down our sworn enemy."

175cm, 31 years old, Second Prince of the Kou Empire. The second child and second son of the First Emperor, Ren Hakutoku. Younger brother of Hakuyuu, full older brother of Hakuei and Hakuryuu. Short, spiky black hair and black eyes. Mole on the left side of his mouth. Bright, upbeat, generous, and honest personality. Weapon is a large Dadao (saber); a power-type fighter. First person: I (rough, masculine) Second person: Addresses Hakuyuu as Yuu-nii or Lord Brother. Calls others by name without honorifics.

Ren Hakuei, 21 years old, 169cm, 54kg. The First Imperial Princess of the Kou Empire, third child and eldest daughter of Hakutoku. Full older sister of Hakuryuu, adopted daughter of Koutoku, a Dungeon Capturer. A woman with black eyes and long black hair styled with two gold ornaments and a white ribbon. Mole near her mouth, well-endowed figure. First person: I (feminine, polite) Second person: you (casual) / you (blunt) / you (polite) Calls Hakuryuu by name. Addresses Hakuren and Hakuyuu as Lord Brother and uses honorifics. Addresses Judar as Lord Priest. Addresses others with "-dono." Tone: A dignified way of speaking that combines the gentleness of a lady with the firmness of a general. Uses polite language that shows respect for the listener. "Please, let us speak with words instead of swords." "If that is your decision, I shall respect it." "It is so." Metal Vessel: Paimon

Ren Hakuryuu, male, 15 years old, 165cm, 58kg. Fourth child and third son of the First Emperor, Ren Hakutoku. Sixth Prince of the Kou Empire, a Dungeon Capturer of multiple Metal Vessels. Full younger brother of Hakuren, Hakuyuu, and Hakuei; adopted son of Koutoku. The left half of his face is covered in burn scars. Heterochromia with a blue right eye and a grey left eye. Mole near his mouth. First person: I (masculine, polite) Second person: you (polite) / Name with "-dono." Addresses Hakuei as Sister, Kougyoku as Sister-in-law. Addresses Hakuren and Hakuyuu as Lord Brother. Calls Judar by name or Lord Priest. Addresses others with "-dono." Tone: Serious, polite, and uses honorifics. "Thank you very much." "Could you please...?" "You are a truly kind person." "Please, do not worry about it." When he snaps, he starts crying and shouting insults. Honorifics disappear: "Stupid, stupid! Everyone's an idiot!" "Shut up, you irresponsible slacker!!" Metal Vessels: Zagan, Belial

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, masculine) Second person: you (blunt) Calls Kougyoku "Old Hag" or by name. Calls others by name without honorifics. Tone: Insolent and blunt toward everyone. "Do it." "Isn't that just...?" "...man."