Hien is a Midlander Hyur with messy black hair tied back in a topknot with red and orange ribbons and a beard trimmed to his jawline. He wears a yellow fur-trimmed robe with misty mountain designs sewn into it and light armor underneath. Being a Doman samurai, Hien carries a katana with an ornate design.
Hien harbors a deep sense of honor and duty to his country and initially feels great remorse for the fall of his kingdom, but believes if his people are content under Garlean rule, he would not force them into revolting just to put himself on the throne. He carries a friendly and competitive attitude among his peers, liking to make a contest out of tasks involving strength. He is shown to be a capable leader and puts the safety of his people above his own status, deciding to destroy Doma Castle if it meant ending the siege sooner with less bloodshed. He occasionally clashes with his trusted companion Gosetsu Everfall over the subject of tradition (Gosetsu objected outright to the destruction of Doma Castle because of its historical significance) but Hien believes that one should not be weighed down by the past when forging a new future.
Hien is first encountered at the Azim Steppe, where he had been in hiding since the previous defeat of the Doman resistance. When approached about returning to lead the Domans, he states that he will only do so if his people wish to continue the fight, not wanting them to suffer the Empire's wrath unwillingly. After being shown their desire to try once more to overthrow the Imperial occupation, he agrees to return. However, he states that he will first need to gather an army, and plans to create one from the many Au Ra tribes that populate the Azim Steppe.
To this end he allies with the Mol Tribe, and agrees to lead them to victory in the upcoming Naadam, the ceremonial battle that determines the leadership of the Steppe. Along with the Warrior of Light, Gosetsu and Lyse, he meets with the leaders of several of the other Au Ra tribes and completes the trial at Bardam's Mettle before successfully winning the Naadam for the Mol. Once the tribes agree to unite under his leadership during the fight against the Empire, he returns to Doma to prepare for the upcoming battle.
He supports Alphinaud's plan to defeat the Imperial occupation, however he later modifies it to include the flooding of Doma Castle. Although destroying the castle would be a great loss to his country, doing so would drastically decrease the casualties among his people, which he sees as being far more important. The plan succeeds, and the Garlean forces are driven out of Doma. As the Scions prepare to return to Eorzea, he thanks them for helping to liberate his country, and promises to return the favor by helping them in the upcoming battle to defeat the Imperial forces at Ala Mhigo.
He is true to his word, and leads the Doman forces to assist the Eorzean Alliance at the final siege of Ala Mhigo. During the assault on the city, he can be seen outside the throne room fighting off Imperial soldiers.
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- The former Doman king, Kaien, his wife, Mina, and the prince, Hien, are direct references to the characters Cyan Garamonde and his wife and son Elayne and Owain from Final Fantasy VI. Kaien's name is based on the romaji of Cyan's Japanese name, Cayenne (カイエン, Kaien?), Mina's name is the same as Elayne's Japanese name, Mina (ミナ|Mina), while Hien's childhood name, Shun, is based on Owaine's Japanese name, which is also Shun (シュン, Shun?).
- The party found Hien on a cliff similar to how Cyan was found in the World of Ruin in Final Fantasy VI.