—Edelgard talking to Byleth
Byleth, is a playable character and the main protagonist in the upcoming Fire Emblem: Three Houses. As an Avatar, their name, gender, and birthday are chosen by the player. In voiced cutscenes, they are referred to as Professor. They possess the mysterious Crest of Flames and can wield the Sword of the Creator. They do not have a confirmed age, with it being listed as "???" in various menus.
Profile
Byleth grew up among mercenaries led by their father, Jeralt Eisner, and earned a fearsome reputation as a warrior known as the "Ashen Demon." After an unexpected incident reveals the Crest of Flames within Byleth, they are offered a position to teach at Garreg Mach Monastery's Officer's Academy by Archbishop Rhea of the Church of Seiros due to Alois' recommendation. Byleth also begins to have visions of Sothis, a mysterious girl with no memory of her past.
Byleth becomes the teacher of one of the three student houses of the Academy: the Black Eagles, Blue Lions, or Golden Deer. As part of their training, Byleth at times leads their students into live combat.
Byleth specializes in swords and uses the Sword of the Creator as their primary weapon.
In Game
Base Stats
| Starting Class | Crest | ||||||||
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 Commoner |  | ||||||||
| Level | HP | Str | Mag | Dex | Spd | Lck | Def | Res | Cha |
| 1 | 27 | 13 | 6 | 9 | 8 | 8 | 6 | 6 | 7 |
| Magic | Combat Arts | Abilities | Starting Items | ||||||
| - | Wrath Strike |  Professor's Guidance | Iron Sword Vulnerary | ||||||
Skill Levels
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| Level | D+ | E | E | E | E+ | E | E | D | E | E | E |
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Supports
- See also: Byleth/Male Supports, Byleth/Female Supports
Like previous Avatars, Byleth is able to form supports with every character in game, including both Rhea and Sothis who are only able to support with them. They are also the only character in game that is able to form an S-Support with their partner. Each gender of Byleth is able to S-Support with all characters of the opposite gender. Male Byleth can form a same-sex S-Support with Linhardt, Gilbert, and Alois. Female Byleth can do the same with Edelgard, Dorothea, Mercedes, Sothis, and Rhea.
Quotes
Three Houses
Heroes
Non-Canon Appearances
Fire Emblem 0 (Cipher)
Byleth is illustrated in the trading card game Fire Emblem Cipher with the following cards:
Possible Endings
"Just a minute! The following section contains spoilers. Viewing it will cost a lot. Are you prepared to pay for it?"
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Byleth - Wandering Flame
- Byleth defeated those who slither in the dark and put down the crazed Immaculate One. In the aftermath of the loss of Fódlan's great leading figures, he/she ascended the throne as the first leader of the United Kingdom of Fódlan. In his/her heart lived the indelible hope that their efforts would one day yield an era in which the people knew true peace and the horrors of war were a hazy memory of the past.
Byleth - Guardian of Order
- Byleth helped Dimitri to finally crush the ambitions of the Empire. After the war, Rhea stepped down from her role as archbishop, and Byleth swore to lead the Church of Seiros in her stead. He/She helped to guide the Holy Kingdom of Faerghus as it brought leadership to the newly unified Fódlan and worked tirelessly to create a peaceful world free from the shackles of oppression.
Etymology
Byleth is a variation of Beleth, a king of Hell. According to Pseudomonarchia Daemonum, Ham, Noah's son, was the first in invoking him after the flood, and wrote a book on mathematics with his help.
Trivia
- Byleth's default name in Japanese differs slightly between genders, as a male Byleth is spelled "ベレト" (Bereto), while the female is "ベレス" (Beresu).
- Byleth's artwork shows them wielding the Sword of the Creator.
- Byleth is the first Avatar character since Mark to not feature a customizable appearance. Their male and female designs are fixed and cannot be edited by the player.
- Byleth is the first character in Fire Emblem Heroes to be made available either through regular summoning, or via recognition of another game's data. At the launch of Three Houses, Heroes players that play both games on the same Nintendo Account will receive a free Byleth unit.
- Byleth is the first avatar protagonist of a Fire Emblem game to physically appear in prerendered cutscenes without the use of a hood or other obscuring garb. Prerendered cutscenes in Fire Emblem Awakening and Fire Emblem Fates in which the avatars were present were depicted from Robin and Corrin's respective points of view, and also, in Robin's case, their face being hooded when viewed in third person, in order to avoid showing their customizable faces in cinematics that could not support the feature.
- Byleth us the first Avatar character to be refers with neutral nouns in the game instead of being refers by their assign genders depending on player choices. The only time they are refers by their assign genders is their ending if they neither S-Support or paired up with anyone.
Gallery
- See main article: Byleth/Gallery.