Kouen Ren

Kouen Ren (練紅炎, Ren Kōen) is the Kou Empire's first Prince. He's the General Commander of the Kou Empire's Western Subjugation Army together with his brothers, Koumei Ren and Kouha Ren. Kouen is a Dungeon Capturer, capturing three Dungeons, and one of Judar's King Candidates.

Appearance
Kouen is a tall man with short red hair tied back into a little ponytail, a goatee, thin eyebrows, and wears a small black hat with a yellow gem in the center. He wears traditional clothes that signify his royal status, and a black cape. He carries a sword with him.

Personality
Kouen seems to be a calm and serious person, but he also likes wars and wants to increase the power and territory of the Kou Empire.

Kouen has a desire to become the one king in the world. He wants his siblings to help him but doesn't wish to force them into helping him. He also wants to solve the riddle of the Toran Language and the King Vessel and how they are linked to the past.

History
Kouen is Second Emperor's oldest child, he and his brother, Koumei, have the same mother.

Kouen was able to conquer three Dungeons.

Second Sindria Arc
Kouen is in the Kou Empire's Army's Base in Balbadd's territory, throne room with the Left General, Kokuhyou Shuu, and the Right General, Seiryuu Ri, waiting for Judar to return. When Judar goes to talk with him, Kouen says for Judar to make him wait, he must've brought him an interesting present. Judar says he has, that he told Sinbad, "Why don't you fight a war, against us?" Kouha and Koumei are surprised that he did this without the Emperor's permission. Kouen starts laughing, and says that's very befitting for the Magi of his empire. Kouen tells everyone that for his empire that will rule the east, the day in which it will rule the world is imminent.

World Exploration Arc
Kouen returns from his campaign to attend at the funeral of the Emperor, his father. When he enters to the palace he finds his cousins​​, Hakuryuu Ren and Hakuei Ren. He claps at Hakuryuu's shoulder and praises him for having conquered a Dungeon.

At night, he is in the palace's library when Hakuryuu and Hakuei enters. He asks to Hakuryuu if he wants to become king, and explain to his cousins what knows about Solomon and the Metal Vessels and why he thinks that only one king must rule the world. Then, he notices his sister Kougyoku, who was hidden behind a bookcase, Kouen asks her if she listen well what he said. He tells Kougyoku that Kouha is back and since it is already late, they will go tomorrow to their father and mother's side.

The next morning, he heads to where the funeral is with his siblings. When his sisters are shocked to see what happened to their father, Kouen asks Gyokuen if the Emperor died because of an illness, she confirms that and suddenly hugs Kouen, Gyokuen says that she only has him left and if he will support her, but Kouen pushes her back. After this, Gyokuen is appointed the next Emperor. When everyone makes a ruckus, she says it's an unavoidable measure and, as Kouen is the General Commander and can't be removed from that important position, he can't be next Emperor until the continental subjugation is complete.

Later, Kouen discusses about Al-Thamen and the increase of power of Magnostadt with Koumei and Kouha, saying that it is becoming a frightening country.

Abilities
Kouen is the strongest general of the Kou Empire. He is the only person besides Sinbad, to capture more than one Dungeon, capturing three.

Advanced Intelligence
 * Kouen is intelligent enough to know how to read and speak the Toran Language.

Djinn
It is hinted that at least one of his three Djinn is a fire Djinn.

Metal Vessel
Kouen's Metal Vessel is a sword and two more unknown objects.

Trivia

 * His name means Red Flames or Prominence in Japanese.
 * Kouen is the only person other than Sinbad to capture more than one Dungeon.
 * His nickname, Entei, means Flame Emperor.
 * Kouen likes fighting (or war) and his weakness is his fashion sense.
 * When he’s not at war, he tends to space out and he thinks his goatee suits him very much.
 * Kouen is on the cover of Volume 16, but he is without his goatee.
 * He thinks his own goatee as stylish, but its revealed to be in the top 3 most unpopular designs.