“I will brook no insult to my queen or my armor! You face Kieran, second commander of the Royal Knights...and your doom!”
—Kieran, fighting Valtome for honor
In this game, Kieran serves as a member of Crimea's 5th Platoon, who, alongside Geoffrey, is entrusted with the honorable duty of escorting Elincia, Crimea's secret princess, from the Daein attack on Melior during the Mad King's War. When the escort is later ambushed by Daein forces, he is captured by the Daein army and held in Castle Canteus. Kieran is later rescued by Ike's forces, whereupon he will remain with them until the game reaches its conclusion. He will then cede his services back to Crimea, serving under the newly-crowned Queen Elincia.
Kieran is first introduced in this game in a base conversation in Chapter 2-3, where he is given a Silver Axe as a gift from Geoffrey himself. Alongside the other Crimean Royal Knights, Kieran will then lay siege to Castle Felirae, essentially falling into Ludveck's trap. The Royal Knights will then rush to Fort Alpea in the next preceding chapter, serving as reinforcements to Elincia's stranded forces.
Kieran later appears as an enemy unit in Chapter 3-12 to the Daein army, representing the Crimean Royal Knights in Geoffrey's absence. The chances of the player managing to engage him in battle, however, are near impossible.
Kieran will survive the judgment of Ashera in Chapter 3-E, and may be assigned to any one of the three groups headed for the Tower of Guidance.
Kieran is a rather hotblooded, loud and proud individual, and is known to announce his name, rank and title before engaging in any battles. He is also extremely enthusiastic of his position as a Crimean Royal Knight, and constantly trains vigorously to protect his honor, often inflicting wounds upon himself in the process without realizing it. Furthermore, Kieran possesses an energetic and hyperactive disposition, and appears to be unable to quell his excitement in any given situation.
Kieran shares a bitter, yet one-sided, rivalry with Oscar, whom he resents for leaving the Crimean Knights. According to a support conversation he shares with Oscar, his rivalry with Oscar started in their second year of enlistment in the Crimean Army when they had just completed their horsemanship training. According to Kieran, during a final horse race, Oscar beat him "by the smallest of margins," while Oscar recalls the distance to be "at least three lengths."
Kieran is a well-rounded unit in this game. He may join the player's army relatively late, but he still proves be a very useful unit, especially if he is assigned Swords or Lances when he is promoted. Kieran has a high chance of capping his Strength, and, to a smaller extent, his Skill. His other stats are average, apart from his relatively high defenses. To further increase his usability, the player is strongly advised to replacing Kieran's Gamble skill with either Savior, Provoke, or Resolve.
Kieran: General... Forgive me! I should have... trained harder... Geoffrey:Kieran... No! I'm coming to help you! Hold tight! Kieran!!
(Kieran dies, game over)
In Part 3: Chapter 10 (as NPC)
Kieran: Hack... I have dishonoured myself before Queen Elincia! Elincia: Kieran, you must retreat! Please, don't throw your life away. Kieran:As... As you wish!
(Kieran retreats)
Kieran is an alternative spelling of the Irish Ciarán, which means "small dark one". Ciarán comes from the Irish word "Ciar", which means either dark or black. Ciar can be linked back to Ciar, son of Fergus, King of Ulster. Ciar is linked to many other names, including Kerry, which hereby means Ciar's People.
Kieran is referred to as Queranus in Latin. It is also used in the vernacular of older rural Irish folk, who refer to it as small, irregular lumps of turf.
His Japanese name, Kevin, is an angelicized form of the Irish-Gaelic Caoimhín, meaning "little comedic one". This may refer to his personality, as he can be very comedic in many situations.