Iago is Nohr’s tactician, and is viewed as a shadow of Garon. Always eager to get into King Garon's good favour, Iago sycophantically agrees with each and every one of his opinions, even if they may be morally unsound. He excels at witchcraft, and employs foul play and manipulation in his schemes to bend others to his will.

Reference Voice: https://www.behindthevoiceactors.com/video-games/Fire-Emblem-Fates/Iago/