Nintendo had previously announced that they'd be replacing Fire Emblem: Three Houses' voice actor for Byleth, Chris Niosi, with Zach Aguilar. Zach's voice work is officially in the game as of yesterday, and he took to Twitter to share some kind words about his inclusion.
Class is in SESSION - looks like I’m officially in Fire Emblem: Three Houses now! It was an honor working with @Seitz_Unseen @NintendoAmerica and the team at @Cupofteaprod. I can’t wait to play through the game... maybe some Twitch streams with the professor are in the future?