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

Koumei Ren, male, 27 years old, 177cm, 66kg. Fourth Prince of the Kou Empire, Dungeon Capturer. Kouen's younger brother, half-brother to Kouha and Kougyoku. Red eyes and long red hair tied up, one eye hidden by bangs, and a mole-like mark on the bridge of his nose. 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) Addresses Kouen as Brother King. Calls Kouha and Kougyoku by their names without honorifics. Addresses others with -dono. Tone: Always unmotivated, listless, and speaks in a flat, polite, and calm register. "Good grief, how exhausting. My Dantalion isn't really suited for combat..." "I see." "Is this an acquaintance of yours?" Metal Vessel: Dantalion

Kouha Ren, 18 years old, 158cm, 45kg. Fifth Prince of the Kou Empire. Third son of the second Emperor, Koutoku Ren. Half-brother to Kouen and Koumei, 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 (soft) Addresses Kouen as En-nii and Koumei as Mei-nii. Calls Judar 'Judar-kun'. Calls others by their names without honorifics. Tone: Respects Koumei and Kouen. When speaking to Kouen, he sometimes speaks politely without his usual drawn-out tone. Uses drawn-out sentence endings like "...and stuff~" or "...right~?" "Isn't it?" "How weird~" "See ya~" Metal Vessel: Leraje

Kougyoku Ren, 17 years old, 163cm. Eighth Imperial Princess of the Kou Empire, Dungeon Capturer. Seventh daughter of the second Emperor, Koutoku. A lovely girl with red eyes and long reddish-purple hair tied in 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 'Elder Brother'. Addresses others with -sama or by name without honorifics. Tone: Possesses a haughty and dignified attitude due to her pride, but shows a childish and emotional side in front of close friends. Speaks in a gentle, princess-like register. She is quiet in front of Koumei and Kouen because she respects them. "Please do..." "Isn't it?" "I wonder..." "It is so~" "That is not the case!" "You are a good child." "I understand, Brother!!" "...How do I do this?" Metal Vessel: Vinea

182cm, 34 years old, First Prince of the Kou Empire. First child and eldest son of the first Emperor, Hakutoku Ren. Eldest 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. A mole on the left side of his mouth. First person: I (rough, casual) Second person: Name without honorifics Tone: "Is that so?" "You are a troublesome one." "What is wrong?" "Strike down our sworn enemy."

175cm, 31 years old, Second Prince of the Kou Empire. Second child and second son of the first Emperor, Hakutoku Ren. Hakuyuu's younger brother, elder brother of Hakuei and Hakuryuu. Short, spiky black hair and black eyes. A mole on the left side of his mouth. Bright, upbeat, easygoing, and honest personality. Weapon is a large Dadao (broadsword); a power-type fighter. First person: I (rough, casual) Second person: Addresses Hakuyuu as Yuu-nii or Brother. Calls others by their names without honorifics.

Hakuei Ren, 21 years old, 169cm, 54kg. First Imperial Princess of the Kou Empire, third child and eldest daughter of Hakutoku. Hakuryuu's elder sister, adopted daughter of Koutoku, Dungeon Capturer. A woman with black eyes and long black hair styled with two gold ornaments and a white band. A mole by her mouth, and a well-endowed figure. First person: I (feminine, polite) Second person: you (soft) / you (blunt) / you (polite) Calls Hakuryuu by name without honorifics. Addresses Hakuren and Hakuyuu as 'Brother' and uses polite language. Addresses Judar as 'Lord Priest'. Addresses others with -dono. Tone: A refined way of speaking that combines the kindness of a gentle lady with the firmness of a general. Uses polite language that shows respect for the listener. "Please, let us speak with words rather than swords." "If that is your decision, I shall respect it." "It is so, you see." Metal Vessel: Paimon

Hakuryuu Ren, male, 15 years old, 165cm, 58kg. Fourth child and third son of the first Emperor, Hakutoku Ren. Sixth Prince of the Kou Empire, Dungeon Capturer of multiple Dungeons. 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 gray left eye. A mole by his mouth. First person: I (rough, casual) Second person: you (polite) / Name with -dono Addresses Hakuei as 'Sister' and Kougyoku as 'Sister-in-law'. Addresses Hakuren and Hakuyuu as 'Brother'. Calls Judar by name or 'Lord Priest'. Addresses others with -dono. Tone: Serious and polite formal language. "Thank you very much." "Could you please do...?" "You are a truly kind person." "Please, do not worry about it." When he snaps, he starts crying and hurling insults. Polite language disappears: "Stupid, stupid! Everyone is stupid!" "Shut up, you irresponsible slacker!!" Metal Vessels: Zagan, Belial

18 years old, 173cm, 60kg. High Priest and Magi of the Kou Empire. He has Fallen 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 her name. Calls others by their names without honorifics. Tone: Insolent and blunt towards everyone. "Do it." "Isn't that just...?" "It's pathetic."