Iago

Iago (マクベス Makubesu, Macbeth in the Japanese version) is a non-playable character and the secondary antagonist in Fire Emblem: Fates on both routes. He is voiced by Akinori Egoshi in the Japanese version.

Profile
Nohr’s tactician, Iago is almost a shadow of Garon. He always agrees with the King and does not like to disappoint. He excels at witchcraft, and enjoys using tactics that involve foul-play and behind-the-scene manipulation.

Birthright
Iago first appears in chapter 8, leading the Hoshido army into a trap against the Wind tribe. Later on, it is revealed that he was the one that brainwashed Takumi in chapter 10, and goes so far as to injure him. On their way to get medicine for Takumi in a nearby building, Iago blocks the way and threatens the Avatar and their allies by using tomes to lightly set Flora on fire. Later on, inside Nohr's castle, Iago brainwashes Takumi, but he breaks out of it, to his shock. Iago and a group of Nohrian soldiers fight the Avatar and the Hoshidan forces, and even though he puts up a good fight, is killed by them.

Conquest
Iago oversees Nohr's invasion of Hoshido, accompanying Garon when needed.

In Chapter 25, inside the Hosidan Palace, Iago appears and talks to the Avatar, reminding them of what they need to do, to their discontent. Although Xander wants to help the Avatar out, Iago tells him that he still has a task to do and leaves with Garon. In Chapter 26, Iago appears with Ganz and wants the Avatar killed, but their siblings protect them from him. As a result, Iago and Gans, along with some of their soldiers and Faceless attempt to kill all of them. After Iago is defeated by the party, he tries to save his own life by negotiating with them but is killed by Leo.

Neutral
Iago appears in Chapter 17, trying to put a stop to the combined forces after Ganz has been killed. However, just like in the other routes, he fails and ends up dead.

Birthright Chapter 16 - Pleasure Palace

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Birthright Chapter 25 - The Traitor's True Colors

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Conquest Chapter 26 - Treachery

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Invisible Kingdom Chapter 17 - Black Flame

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Etymology
Iago is the villain of a tragic Shakespearian play, Othello, in which he masterminds the downfall of the capable and powerful Othello out of jealousy.

Macbeth is the titular character of another tragic Shakespearian play, Macbeth. In this play, Macbeth and his wife devise a plan to assassinate the king and claim the throne, marking their ruin.

Trivia

 * Iago shares his Japanese voice actor, Akinori Egoshi, with Ignis.