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Characters / Fire Emblem: Three Houses - Byleth

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Byleth Eisner

Class: Commoner → Mercenary/Priest → Swordmaster → Enlightened One

Age: ?? (About 21 Pre-Timeskip) (9/20)

Crest: Flames (Major)

Height: 175 cm (male)/164 cm (female)


Male Byleth Voiced by: Yuusuke Kobayashi (Japanese), Zach Aguilar (English)note 
Female Byleth Voiced by: Shizuka Ito (Japanese), Jeannie Tirado (English)
Click here to see both Byleths in Fire Emblem Heroes 

The main hero of the game, Byleth was a member of their father's mercenary group until they came across a group of youths from the Garreg Mach Monastery under attack, at which point they saved them and an unknown power awakens with them. Impressed with this, Byleth is offered to teach at the Garreg Mach Monastery, including the same youths they saved.

Their personal ability, Professor's Guidance, grants them and any adjacent ally twenty percent more Experience. Post-timeskip it is upgraded to Professor's Guidance+, increasing their damage dealt. They bear the Major Crest of Flames, which will occasionally restore health based on the damage they deal and rarely raises Might and stops counterattacks.


They were announced as DLC for Super Smash Bros. Ultimate, as the fifth fighter on the first DLC Fighter's Pass, representing Three Houses.

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    # — D 
  • 13 Is Unlucky: Inverted. Byleth is the 13th attempt on Rhea's part to create a vessel for Sothis, and the one that finally succeeded in bringing her back to an extent. Ironically, they weren't even an intentional attempt, but a product of converging coincidences. Which turned out to be a meaningful number, as the name Byleth (One of the alternative spellings for the demon Beleth), is number 13 of the 72 Demons of Ars Goetia.
  • The Ace: They were a mercenary before becoming a teacher at the Officers Academy, yet is skilled enough to teach the continent's most elite. After the timeskip, their allegiance alone decides the fate of the war.
  • Aerith and Bob: Byleth's name derives from a demon, contrasting with most other characters' names that would be reasonable to hear on actual people. They share this trait with their mother Sitri, and this most likely hints to their Ambiguously Human nature.
  • Affectionate Nickname: Several. Jeralt calls them "kid". Their students (sans Claude) all call them "Professor" even after graduation — right before the Time Skip, Claude decides to call them "my friend" from then on, even if it's "for lack of a better term".note  Finally, in female Byleth's S-support with Dimitri, he calls her "my beloved".
  • Ambiguously Human:
    • Between their father having Nabatean blood (from when Rhea saved him as a youth) and their mother being a homunculus created by Rhea specifically to house Sothis's soul (an experiment that failed) and having Sothis's Crest engraved on their hearts, it is ambiguous how human Byleth really is, not helped by the fact that they have been generally emotionless their entire life before becoming a teacher. Gets even more ambiguous after fusing their soul with the Goddess Sothis’. The Cindered Shadows DLC does somewhat clarify this; their mother, Sitri, was indeed a homunculus, but she was more of a Nabatean than human, meaning that Byleth is technically a Half-Human Hybrid.
    • There's also the question of their lifespan. In most of their paired endings, they live long and natural lives with their loved one. In Flayn's, it's instead suggested they've become as long-lived as the other Nabateans. And in Seteth's S-support, he talks about living long with a female Byleth like it's fact. To muddle the issue further, by virtue of holding Sothis' Crest Stone inside them they became a first-generation Crest bearer (namely the Crest of Flames), who are explicitly said to live hundreds of years, as demonstrated by Jeralt, Nemesis and the Elites (and Maurice living for a thousand years, albeit in a monstrous state), and Yuri, whose ending with male Byleth's states that historical records seemed to show that both had very long lifespans and seemed to remain young for a very long time. To compound this even further, history is written by fallible historians, and it's entirely possible in some non-Crimson Flower endings for them to fake their death. Notably, despite having a paired ending with Sothis, their endings are exactly the same as the non-paired ones, since Byleth never informs the world of her.
  • And the Adventure Continues: In their Crimson Flower solo ending, they are stated to go to battle against "those who slither in the dark" after the war's end.
  • Arch-Enemy: On the Crimson Flower route, they become this to Rhea. Out of all the possible antagonists, she bears the most hatred towards Byleth because she is driven mad by their refusal to kill Edelgard and interprets this as a betrayal and becomes obsessed with killing them. In the second half, she refers to them as the second coming of Nemesis, which considering her own hatred for him, speaks volumes of her hatred towards them, and even burns down Fhirdiad in an attempt to kill Byleth and the Black Eagles Strike Force.
  • Audience Surrogate: Byleth has grown up living a mercenary life with Jeralt, having little knowledge of the world outside of battle. Because of this, Byleth does not know many historical or political details about Fódlan, so the other characters will sometimes explain parts of the setting and lore to Byleth (and thus to the players).
  • Awesome Moment of Crowning
    • Byleth is crowned ruler of the United Kingdom of Fódlan at the end of the Verdant Wind and Silver Snow routes.
    • They are named the new Archbishop of the Church of Seiros after Rhea steps down on the Azure Moon route. If Byleth is female and marries Dimitri, she becomes queen of the Holy Kingdom of Faerghus in addition to that.
  • Aw, Look! They Really Do Love Each Other:
    • Whenever people ask about Jeralt, Byleth's responses make it seem like they're indifferent to his existence. But when Jeralt dies, Byleth cries for the first time, making it clear that they really do love their father.
    • Earlier, Jeralt can mention to Byleth that he's left something for them in his office in case anything happens to him, and Byleth can insist that he not talk like that. This nets Jeralt's approval.
  • Badass Cape: Both genders wear a black Coat Cape that highlights their strength in battle.
  • Badass Teacher: They have no compunctions about taking the front lines along with their students.
  • Babies Ever After: Some of their paired endings:
    • Male Byleth when paired with Lysithea (outside of the Crimson Flower route), Flayn, Manuela or Shamir.
    • Female Byleth when paired with Lorenz and Sylvain outside the Azure Moon route.
  • BFS: Early in the story, Byleth obtains a greatsword with a unique, winged crossguard called the "Sword of the Creator." Amongst other things, it also functions as a Whip Sword when attacking at range.
  • Big Eater: Their students express surprise at how much Byleth can pack away in post-victory feasts, during the school phase. In a case of Gameplay and Story Integration, Byleth can share a meal with people as many times as the number of your activity points, but you can't select anyone else more than once on the same day. Apparently Byleth has one hell of a bottomless stomach.
  • Big "WHAT?!": Female Byleth's response when Dedue leaves Dimitri's service to propose to her in their S-support is a giant "What?!"
  • Bishōnen: Male Byleth has soft facial features that are only slightly more masculine than his female counterpart, which is even more evident when you compare his pretty features to his father Jeralt’s gruffer features. When we see Byleth's mother Sitri in Cindered Shadows, it's fairly obvious whom he got his softer looks from.
  • Blade Lock: Performs this against Emperor Edelgard and her rapier, before both make an attempt on the other's throats.
  • Body Motifs: The heart. Music associated with them such as The Crest of Flames has a subtle Heartbeat Soundtrack. This is because of their stillborn birth, only living thanks to Rhea implanting the Sword of the Creator's Crest Stone into their heart, intertwining them with Sothis.
  • Boobs of Steel: Female Byleth is quite well-endowed (according to game data, she's the second bustiest playable character in the game behind Manuela, both before and after the timeskip) and is also a leader of one of the three houses of the Officers Academy, making her the strongest member of said house.
  • Brooding Boy, Gentle Girl: Female Byleth is this to Dimitri post-timeskip, as Dimitri is left brooding and unstable, while she is more in touch with her emotions by then. There's even a lot of symbolism of her pulling him from the darkness back to the light.
  • Brought Down to Normal: They turn back into a regular human at the end of the Crimson Flower route. This is highlighted by the fact that their hair returns to its regular color again and that, for the first time in Byleth's life, their heart starts to beat normally. That said, exactly how normal is unclear. The Crest Of Flames likely remains, and its last bearer was the flagrantly superhuman, immortal, and seemingly unkillable Nemesis. It's noted in their paired S-support with Sothis that they are still fused with the goddess, which is where the godly power comes from after they performed their Fusion Dance, leaving it unclear exactly why the power vanishes when the Crest Stone no longer serve a purpose years before it disappeared.
  • Brutal Honesty: Dialogue options let you have this, if you so choose. For example, upon being asked by Manuela if they think she'll die without ever finding true love, they can bluntly say "Yes". In a bit of Gameplay and Story Integration, many of your dialogue options in the early game will consist of these to demonstrate Byleth's initial lack of emotions and lack of social experience.
  • But Now I Must Go: In their paired ending with Jeritza, the two vanish without a trace after the battle with "those who slither in the dark".
  • Calling Parents by Their Name: It's unclear if Byleth makes a habit of this, but one dialogue in the C-support event with Alois has them call Jeralt by name.
  • Call to Adventure: Played with. Byleth is a mercenary working with their father's group at the start of the game, but ends up having to take up a position as a teacher at a military school for the continent's elite due to the previous teacher running away from bandits in a prologue and being recommended by Alois to Rhea. Byleth's adventure ironically forces them to do less adventuring.
  • Canon Name: Byleth is theirs. No other characters have been heard referring to them by name, however (merely "professor" or other terms), the only exception being the game's launch trailers, in which Jeralt calls Byleth by name. In Japanese, their name is actually done with slightly different but still valid Japanese pronunciations depending on gender; Bereto for the male Byleth and Beresu for the female Byleth.
  • Canon Identifier: Because the player can choose whatever name they like and the game is fully voiced, everyone — even the other teachers when speaking among themselves — just calls Byleth "Professor".
  • Can't Catch Up:
    • During the early game, Byleth will usually fall behind their students in terms of skill levels because of the limited time they have during Explore, which is the only way for Byleth to receive instruction. However, they have very good stats to make up for this, and as Byleth's teacher level goes up, raising their skills becomes easier, and fortunately raising supports with students you want to recruit lowers the requirement to do so.
    • This can become subverted in the War Phase of the game, as instead of simply being able to give your students items and invite them to tea, you can now run Advanced Drills with them, which simply amounts to the student giving Byleth a large amount of skill points in skills said student excels at. The benefit of this is that it allows Byleth to gain a large amount of experience for skills they wish to build up for new classes as during the Academy Phase, there were fewer opportunities for each skill due to the limited amount of trainers. Likely they will still lag behind some, but this offers a more solid opportunity to catch up if you have the activity points to spend and students with diverse skills.
  • Cassandra Truth:
    • Some characters, most notably Seteth, ask Byleth questions about who they are, and the only answers you can choose are "I don't know" or "I don't remember". The askers usually don't believe what Byleth says.
    • When Dorothea says "it's like your heart isn't even beating" in her B-support, you have the option of confirming that your heart really isn't beating. Despite dialogue implying that she even checks for herself, Dorothea assumes it's just a well-executed prank.
    • When Edelgard asks where they’ve been for five years, they can reply with "sleeping". She takes it as a joke, one she doesn't appreciate.
  • Character Customization: Downplayed compared to previous avatars such as Robin and Corrin, as the only things that are customizable about Byleth are their gender, name, and birthday.
  • Character Development: Downplayed due to their nature as an avatar for the player, but it's noted that Byleth slowly starts to become more social and expressive due to their time as an instructor at the monastery.
  • Cincinnatus: Several of their paired Crimson Flower endings have them retire from their position as Adrestia's toughest general to a modest life after the war's end, such as Mercedes' (starting an orphanage together) or Annette's (returning to the Officer's Academy as teachers).
  • Coat Cape: They wear their jacket in this manner. It even has a couple of cut-outs in the armpits to pull off the look.
  • Combat Medic: Their unique class, Enlightened One, lets them use light magic as well as physical weapons, and if they have sufficient Faith, allows them to cast Heal and Recover.
  • Combat Stilettos: Female Byleth wears stilettos into battle.
  • The Confidant: Many characters in the game will only confide their insecurities, dark secrets, and inner turmoil to Byleth.
  • Conflicting Loyalties: If you're a Black Eagle, the choice in the Holy Tomb is between siding with the lawful authority who has been signing your paychecks for the past year or the student you have been teaching for the same amount of time.
  • Contrasting Sequel Main Character:
    • Unlike Kris, Robin, and Corrin, Byleth is a Silent Protagonist whose only customizable features are their name, gender, and date of birth. Thanks to their time as a mercenary, they also start out as an Experienced Protagonist when the game starts compared to the former three, who start out as talented but relatively inexperienced individuals.
    • In regards to Robin and Corrin specifically, Byleth also breaks the streak of the Avatar having white hair. Byleth’s connection to Sothis is also quite benign in comparison to the ones that Robin and Corrin have with Grima and Anankos, both of whom are the Big Bad of their respective games, while Sothis can be said to be the Big Good due to the support that she gives to Byleth.
    • In regards to Robin in particular, the former was created through select breeding in order to become Grima's perfect vessel. In contrast, Byleth became Sothis' vessel more or less by accident. They turned into her vessel due to a complication during Byleth's birth that made their mother, Sitri, beg Rhea to save their life by transferring that crest stone in her heart (which contained Sothis' essence) to Byleth instead. Furthermore, whereas Robin refused Grima's proposals to become his vessel as it would result in the world's end, Byleth accepts Sothis' offer in order to save themselves and everyone else around them.
    • Byleth's background and familial situation is also starkly different from Corrin's. Byleth has a good relationship with their father Jeralt, while Corrin's "father" Garon tries to have them killed. Byleth is an only child, while Corrin has four adoptive siblings (from Nohr) and four more step-siblings (from Hoshido). As a result, Byleth feels no attachment to the other houses, while Corrin angsts about having to face their "other" family in Birthright and Conquest.
  • Cool Teacher: Their students definitely regard them as one, and Byleth is shown to love their class so much that their first thought, upon waking up to find five years had passed, is to go find them.
  • Creepy Child: Jeralt's diary mentions that even as a baby, Byleth never cried or smiled.
  • Cutscene Incompetence:
    • Byleth in cutscenes is prone to forget they can rewind time (and in fact can do so several times in a row), even when it'd be useful. The one time where they do (only to find their attempt to meddle to be foiled) to prevent Jeralt's death, they make no other attempts to rewind time and try a different approach. note 
    • Besides not pulsing, Byleth also tends to stand there and let the villain do things rather than try anything to stop them during cutscenes. Whether this is a result of them not seeing alternative results from Divine Pulse or not is up to interpretation.
  • Dark Is Not Evil: Although they wear predominantly black armor, they're a heroic individual. Female Byleth does possess a bit less black and more white in her outfit, however.
  • Deadpan Snarker: Dialogue options are present for Byleth to make funny or dry comments with their completely deadpan face.
  • Death by Childbirth: How their mother died. It’s later revealed that Byleth would have died with her had Rhea not placed the progenitor god’s Crest Stone within their heart at their mother's wishes.
  • Declaration of Protection: Makes one of these toward Balthus in their B-Support. If Female Byleth reaches an S-Support with him, he reveals that he was rather flustered when she said that.
  • Deuteragonist: In all routes except the Silver Snow route, Byleth becomes the secondary protagonist in Part II while the main lord becomes the focal point of the story.
  • Defector from Decadence: The Crimson Flower path is them doing this to the Church. Throughout the story, regardless of house, Byleth is allowed to voice misgivings towards the Church's actions and Rhea herself, but only the Crimson Flower path allows them to act on it. The very moment that causes their defection if they so chose, is Rhea ordering them to execute their own student immediately and without any form of investigation as to what motivated her actions and crimes. Notably them doing this causes Rhea to snap.
  • Did You Think I Can't Feel?: There are several points where characters express surprise at Byleth showing emotion, which gives you the chance to react with this. Most notably, this trope is in play with each lord during the academy phase.
    • When Edelgard catches Byleth crying over Jeralt's death she expresses surprise that they could cry over anything, though admits that was rude to say. You have a dialog option to agree it was.
    • Dimitri will confess at one point that he thought Byleth was emotionless and didn't care about the class, and both their expression during the confession and the "That stings" dialogue option show them being hurt by that. He apologizes and says he knows differently now.
  • Dismissing a Compliment: Byleth has numerous dialogue options that brush off compliments towards them.
  • Divine Date: Byleth of either gender can romance Sothis, the Goddess of the Church of Seiros.
  • The Dreaded:
    • In all routes, they come with a pre-existing reputation as the "Ashen Demon" among mercenary circles due to their combat prowess and habit of showing absolutely no emotions when battling enemies, and was just as feared as "Blade Breaker" Jeralt was.
    • In some routes, by the time they finally get to confront the Flame Emperor, it's implied they have become this for the latter.

    E — M 
  • Emotionless Girl: Or guy, depending on gender. Either way, they don't really express themselves very much initially, and several students describe their neutral expression as "stony." This was apparently the par for the course of their life before joining the Academy; they never laughed or cried, something that disturbed Jeralt, and as a mercenary they earned the nickname "Ashen Demon" due to their dark hair and the way they cut down enemies without even a hint of an emotion on their face. Their time as a teacher at Garreg Mach eventually causes them to become more emotional and they cry for the very first time over Jeralt's body as he lies dying. He says that he's sad to see them cry, but is sorta happy that the very first time he's ever seen them cry, it's over him.
  • Everyone Calls Him "Barkeep": Due to their name being customizable in a fully voice-acted game, the majority of the time, Byleth is referred to via their job title "Professor," or "Teach" in Claude's case.
  • Everyone Has Standards: Byleth's own moral code and ultimate allegiance depend on the player's choices, but there are a few lines they can never cross:
    • They have a deep, personal loathing for "those who slither in the dark", and unlike Hubert and Edelgard, never seek their assistance even on Crimson Flower. The only possible instance of Teeth-Clenched Teamwork between them is in Hubert's paralogue, wherein Byleth is tasked with saving their mages from a predicament they've put themselves in, and even then, there's nothing stopping you from letting them sustain heavy lossesnote .
    • They will always oppose Edelgard's raid on the Holy Tomb, even if you attended her coronation on the Black Eagles route. Only after she's been thwarted can they decide to side with her, and even then, Edelgard will abandon her plans of using the Crest Stones from the Holy Tomb as a result.
    • They show clear contempt for Acheron's opportunism and Chronic Backstabbing Disorder, to the point that the two can never fight on the same side under any circumstances.
    • In Bernadetta and Jeritza's supports, they're sympathetic to the horrors the two have suffered at the hands of their abusive fathers, and regard said fathers as utterly despicable for what they've done.
    • They're incredibly protective of the students in their chosen house, and will never betray or turn against them under any circumstances, and they most definitely do not appreciate anyone who threatens or antagonizes one of them; in one instance where a scholar begins throwing threats and accusations at Marianne, the only dialogue choice the player is given is to yell at the man to get out. The only exceptions are Edelgard and Hubert in the Silver Snow route, and even then, they're the ones who betray you.
    • They are hinted to have a dislike of unnecessary bloodshed and suffering even when they have to kill, most notably expressed by cutting down Randolph in a clean and quick manner as opposed to a slow and torturous one intended by Dimitri.
  • Everybody Knew Already: More simply Byleth. If it's the option, Seteth will come clean about his parentage and that Flayn is really his daughter, and he expresses surprise when they tell him they already figured it out after making great pains to keep it a secret.
  • Experience Booster: Byleth's personal skill, Teacher's Guidance, not only grants them an extra 20 percent boost to experience gained, but also to any adjacent allies.
  • Expy: They have many parallels with Shulk. Wielders of legendary swords who have the ability to change the future, were motivated by revenge for the loss of a loved one, and have technically been dead for all of their life, only being kept alive by the soul of a God who they are meant to be a vessel for. Said God's soul was placed inside them by a supposed parental figure who is Long-Lived. The difference is that Sothis is ultimately benevolent and Rhea isn't inherently evil, while Dickson and Zanza were both pieces of work and ultimately irredeemable.
  • Fatal Flaw: Their Leeroy Jenkins tendencies nearly bite them in the ass a few times. All of those times, Sothis reprimands them for doing what they did when they could have used other alternatives in dealing with certain situations.
  • Fiery Stoic: They are, for a large chunk of the game, a highly unemotional person, and most of their Reason spell list is Fire-based.
  • Foreshadowing: Occasionally, bits of memory seem to slip from Sothis' mind and into Byleth's. One early example of this has Byleth wondering "since when was it called the Red Canyon?" as they look upon Zanado. This foreshadows that the event that gave it that name happened after Sothis was slain.
  • Forgot About His Powers: Byleth tends to shirk using their time-rewinding powers in order to prevent terrible things from happening. Sothis lampshades the event where Byleth gets banished by Solon, which has them being bound by dark tendrils and just glaring, with no explicit indication that the dark magic was hindering Divine Pulse. Specifically, she asks why they just stood there after-the-fact.
  • Four-Temperament Ensemble: Phlegmatic. As the Heroic Mime, Byleth has little in the way of proper characterization. Their dialogue options paint them as an Emotionless Girl (or Boy), and a Nice Guy (or Girl), and they generally lean more towards humility than arrogance.
  • Friendless Background: Due to their childhood being spent on the road with their father and his mercenaries, they never really had any friends before coming to the Officers Academy. In fact, in Heroes, Female Byleth’s A-rank conversation with Sharena shows that she doesn’t actually know the distinction between a friend and an ally, much to Sharena’s surprise. Although by the S-rank conversation, Byleth has a better grasp of friendship, and officially befriends Sharena.
  • Fusion Dance: Fuses with Sothis in order to escape from Solon's trap, changing their hair color from teal to light green and granting Byleth her powers as a goddess. Doubles with Emergency Transformation.
  • The Gadfly: Some of their dialogue options paint a very impish nature underneath their stoic exterior. When Byleth first meets Sothis, she asks what you are; two of your responses are "demon" and "ghost". Picking one has her admonish Byleth to be serious, upon which they can pick the other.
  • Gameplay and Story Integration:
    • They grew up outside of the influence of the Church of Seiros, hence not having a particular affinity or weakness for faith at the beginning of the game, but become one of the Church's strongest knights, find out that the goddess of Fódlan was implanted within them in their infancy, and in one route ends up as the new Archbishop after Rhea retires, hence a budding talent in faith.
    • Despite having the potential to be classed as a mage or Magic Knight, Byleth's spell list leaves a lot to be desired. Byleth spent their life being raised by Jeralt as a mercenary. Jeralt himself is a Paladin who does not use magic at all. So it makes sense that Byleth's own skills and growth in magic is lacking compared to the students who were trained in it since a young age, or have a hidden boon like Felix and Sylvain.
    • On a similar token, while Byleth is nominally a Jack-of-All-Trades, being usable in potentially any class they classed in, the actual combat arts that Byleth is capable of learning favors them towards Sword & Brawling oriented classes. It's another hint at Byleth's relation to Rhea.
  • Gender-Neutral Writing: In-game, dialogue is carefully written so Byleth is not referred with pronouns, with few exceptions. Characters use different monikers and titles to refer to Byleth (hence avoiding having to voice the name the player chose), and use those names in place of pronouns. However, the Death Knight will address Byleth as either "That Man" or "That Woman" depending on their gender.
  • Gendered Outfit: Male Byleth wears black and dark grey armor which covers almost his entire body, except his head. Female Byleth’s armor is altered in various ways to give her a more feminine appearance. Overall, she shows more skin and has lighter colors than her male counterpart.
  • Get Out!: In Marianne's paralogue, a Crest Scholar accuses of Marianne of being the Wandering Beast in the Edmund territory and demands to hand her over. Byleth does not hesitate nor flinch to yell at him to get out; in fact, this is the only dialogue option you are presented with, making it clear that Byleth does not appreciate someone threatening their students.
  • Good Stepmother: Seteth is female Byleth's potential marriage candidate, meaning Flayn becomes her stepchild. Very notable since this is the first instance of a Fire Emblem protagonist avatar marrying someone who already has a child.note 
  • Guest Fighter: They're the sixth downloadable character of twelve in Super Smash Bros. Ultimate, and the last of Fighter's Pass 1.
  • Hallucinations: At the start of the game, a discussion with Jeralt reveals that Byleth has been dreaming of a war and a girl sitting on a throne for some time now. It isn't until their encounter with Edelgard, Dimitri, and Claude that they learn more about Sothis and actually learn her name.
  • Happily Married: Post-war, they can marry one of their students or allies, and their union is invariably described as loving and peaceful.
  • Hazy Feel Turn: In the Crimson Flower route, Byleth betrays the Church and defects to Edelgard's cause. If Edelgard's portrayal in the Crimson Flower route were anything like her portrayal in the other three routes, especially the Azure Moon route, this would unquestionably be a Face–Heel Turn. However, due to the Crimson Flower route's use of Grey-and-Gray Morality, it's ultimately up to the player's interpretation to determine whether this is a Face–Heel Turn or a Heel–Face Turn.
  • The Heart: They become the emotional support and center of whichever class they choose. The Azure Moon route makes it most explicit, with Annette saying their class wouldn't be the same without them and Dimitri outright calling them 'the heart of the Blue Lions'.
  • Heartbroken Badass:
    • They don't take Jeralt's death well at all, it being the first time they ever manage to cry in their life.
    • They're immediately upset over their mistake forcing Sothis to give up her individuality to save them, and will sadly think about how they can't hear her anymore in the next exploration sequence. If you S-support her, they will declare how lonely life was without her and start to cry when she returns.
    • While they don't shed tears over it, Byleth is noticeably saddened about having to kill Edelgard on the Verdant Wind/Silver Snow routes after hardening their heart to fulfill her request.
    • They're visibly distraught when they see how Dimitri's fared in the timeskip, and they have several dialogue options about how they miss the Dimitri they knew.
  • Heroes Prefer Swords: They wield swords in nearly all promotional materials shown, and their personal weapon is a sword, alongside starting with a sword and wielding swords in cutscenes. Additionally, they start with a higher rank in Swords than other weapons.
  • Heroic Mime:
    • Played straight when interacting with other characters in the overworld: The player is given options on how Byleth will reply to certain questions, but their dialogue is not voiced, though they may change expression and gesture.
    • Averted in battle and Fire Emblem Heroes, where Byleth has voiced quotes like any other character, although Sharena notes that they're not the chatty type in Female Byleth's bio. Fittingly, in Heroes, most of their dialogue is rather short and straight to the point.
  • Heroic Self-Deprecation: In Heroes, they mention that they don't think they're a very good professor. Several other dialogue options during Supports give them the opportunity to dismiss compliments about their teaching or battle skills.
  • Hidden Buxom: Female Byleth's cleavage window is covered by her large necklace, but internal modifiers indicate she is the second-bustiest female playable character in the entire game, ahead of even Dorothea and Hilda and just behind Manuela. Her Fire Emblem Heroes bikini makes it apparent her breasts are enormous - the largest of any female protagonist in the series (especially since both Robin and Corrin appeared in bikinis previously). Though, this same art also reveals she is still slightly less well-endowed than Rhea herself.
  • Human Mom, Non-Human Dad: Inverted and played with; Byleth's mother is Sitri, a homunculus “born” of Sothis’s crest stone, and while their father Jeralt obtained a Major Crest of Seiros directly from Rhea via blood transfusion, he's an otherwise ordinary human, with all the vulnerabilities that come with it. His only two notable traits from the blood are a bit more strength than the average human and drastically slowed aging. And that's not even factoring Sothis' presence within them either. This also makes Byleth the third lord/avatar unit in the series to not be entirely human, being preceded by Corrin (half-human, half-dragon) and Micaiah (a Heron-descended Branded).
  • Informed Attribute:
    • On the Crimson Flower route, one of Edelgard's stated reasons for taking a shine to Byleth is that she finds they're ideal for offering to argue against her, and to help her think. Not only is Byleth the most passive in vocalizing their opinions on said route, but there are six dialogue trees where it's possible to lose support points with Edelgard by making Byleth disagree with her. By comparison, Claude has two branches (one in which you agree with Edelgard to probe him on his past, while another is urging him to interrogate a shaken Flayn), and Dimitri has only one (where you parrot the Flame Emperor's disavowal of the Remire massacre to him).
    • Byleth's tactical awareness and fighting capabilities are talked up a great deal by those around them. In practice however there are three instances over the course of the story where Byleth's Leeroy Jenkins tendencies could have led to their death if not for literal divine intervention bailing them out. Indeed, some of the tactical skills Byleth is praised for are implied to actually be just how the people around them interpret Byleth seemingly knowing what is going to happen before it does and the orders they issue to take advantage of it. To observers it seems like they just have a superlative sense for battle tactics and reading people, when in truth at least some of the time it's because Byleth literally does know what is about to happen.
  • Implied Love Interest: To the three main lords on each of their respective routes, as they're noted to be the closest to the three house leaders bar none. Most notable with both Edelgard and Dimitri, as it's their close bond with Byleth that manages to prevent the two from sinking any deeper into darkness and becoming potential monsters themselves. They're also this to Rhea in the Silver Snow route. Her life can even be saved at the end if Byleth chooses to S-support her.
  • Improbable Age: Despite being in their early twenties, not much older than the majority of the students they teach, Byleth gets hired as a head instructor at the academy. This gets acknowledged in-universe by teachers and students alike.
  • In-Series Nickname:
    • Their students call them "professor," probably to get around the fact that their name is customizable, and of course, because Byleth is their professor. Claude, however, calls them "teach" while Balthus calls them "pal" and Hapi calls them "Chatterbox''.
    • "Kid" by Jeralt, once again to get around the fact that their name is customizable, as he's one of the few characters who wouldn't call them "professor."
    • They're known as the "Ashen Demon" by those who fear Jeralt's mercenaries, due to their dark hair, lack of any sort of emotions, and extreme prowess in cutting down enemies.
  • Jack-of-All-Trades:
    • They have three proficiencies at the start of the game, can develop an additional proficiency in faith through training, and has no particular weaknesses when handling weapons.
    • Byleth's growth rates are fairly above average across the the board with the exception of Magic, Defense and Resistance note . While Byleth tends to favor sword-based classes more, they can still technically fill any class the player opts them to.
  • Lady of War: Female Byleth is a calm, reasonable and highly skilled woman from a mercenary background, and early on she becomes a teacher at a military school.
  • Last Minute Hookup: Unlike their predecessors, Byleth can’t actually S-Support until after the final boss on any given route.
  • The Leader: Played straight and zigzagged. Prior to working as a teacher, Byleth was a member of a mercenary group, but the leader was their father Jeralt. As a professor, Byleth is the leader of one of the three school houses and is also tasked with overseeing the education, battles and training of all the students in the school, often acting as The Strategist, though they primarily take tactical command rather than making overall strategic decisions.
  • Leeroy Jenkins:
    • In the beginning of the game, they run in front of Edelgard after Kostas gets up to attack her, intending to take the hit for her. Sothis even mentions how stupid it was for them to do so and is forced to teach them Divine Pulse to rewind time.
    • Having a very personal beef with Kronya, who is panicking out of her mind when they defeat her, Byleth chases her onto a platform without paying attention to their surroundings, and Solon performs a ritual that banishes them to a dark void. Sothis scathingly yells at them for being so reckless and walking into an obvious trap, which forces her hand in performing a Fusion Dance.
    • If Byleth chose the Blue Lions, Golden Deer, or sides with the church after choosing the Black Eagles, in chapter 12 during the Imperial army's assault on Garreg Mach, Byleth goes to rescue Rhea even after she tells them to leave her behind. Thales takes an opportunity to hit them with a dark spell, and they're sent plummeting into a ravine and lose consciousness for five years.
  • Light 'em Up: Can cast offensive Faith spells, such as Aura, in their Enlightened One class.
  • Light Girl, Dark Boy: Female Byleth's outfit incorporates whites and lighter greys compared to male Byleth, who wears all blacks and dark greys.
  • Like Father, Like Son:
    • Though Byleth's stoicism is implied to be the result of Sothis' Crest Stone giving them life, Alois mentions to them that Jeralt doesn't show his emotions easily either and can also be difficult to read. So they likely get it from him in some degree. Also, Alois mentions that Jeralt was quite a master fisher, which Byleth can easily do as well.
    • In Cindered Shadows Aelfric reveals that their mother had difficulty showing emotion as well possibly for the exact same reason as Byleth all things considered. Apparently she only really smiled around Jeralt.
    • Male Byleth can potentially be like his father if his romance options are either the pious Mercedes or Marianne when meeting them at Garreg Mach, as his mother was a nun there and she fell in love with Jeralt. Even Rhea can be this if Male Byleth chooses to S-Support her.
  • Likes Older Women: Male Byleth can S-Support Shamir, Catherine, Manuela, Flayn, who is Really 700 Years Old, and Rhea, all of which are implied to be older than him. And if we count her, Sothis. Female Byleth has an inverse, being Hanneman, and Seteth (who is Really 700 Years Old). Female Byleth can also S-Support Rhea.
  • Living Emotional Crutch:
    • To the three main Lords, but more specifically Edelgard and Dimitri. Without the presence of Byleth in their lives, they progressively become more antagonistic in routes where they're the enemies.
    • To Bernadetta. Her A- and S-support conversations will have her basically declare Byleth such, that she only can face the outside world and new places with them around.
    • To Marianne. She admits that before they came along, she was in a state of deep depression and prayed to the goddess to end her life, but that Byleth's support has lifted her from such a state.
    • To Rhea, whose madness over seeking her mother and the past of the Red Canyon causes her to make the same mistake.
  • Luminescent Blush: Female Byleth blushes when S-Supported with a handful of characters, notable since her emotions are stunted, and she rarely expresses herself in other situations.
  • Magically Inept Fighter: Downplayed. They're decent with magic and have a reliable spell list, but their Magic growth is considerably lower than their Strength growth, which generally means a magically built Byleth still won't match up to the game's more dedicated spellcasters. They also start with a flat E rank in both Reason and Faith, meaning it takes a good amount of time for them to reach the point where they can start casting spells, which usually involves dedicating a lot of time to Facility Training to get that far.
  • Magic Knight: Their plot-related class, Enlightened One, allows the use of Faith magic in battle alongside their sword.
  • Master of All: Much like Robin before them, their overall great growths and potential to specialize in any class and weapon make them this.
  • Master Swordsman: Or Swordswoman. Byleth primarily wields a sword and has enough skill to teach students at a Military Academy where the future leaders of the continent attend. Besides theoretical knowledge, Byleth survived as a mercenary before becoming a teacher and is strong enough to lead the students in actual battles, despite not being the leader of their father's mercenaries. Felix, a childhood friend of Dimitri, can actually be recruited to another house based solely on his desire to see Byleth's swordplay up close.
  • Meaningful Name: "Byleth" is one of the spellings used for Beleth, a demon king from demonology. Fitting for a mercenary clad in black and one who's also called the "Ashen Demon" thanks to their stoic approach to battle.
  • The Mentor: They're this to the students of the Officers Academy, heading one of the Black Eagles, Blue Lions, and Golden Deer. They even jokingly lampshade this in some of their battle quotes, declaring, "Let the lesson begin!" or "Allow me to demonstrate!" despite being in an actual life-or-death battle. All their students continue referring to Byleth as their teacher even after the timeskip, highlighting how much respect they have for Byleth.
  • Mercy Kill: At the end of chapter 14 on the Azure Moon route, Byleth steps in and quickly cuts down the defeated Randolph, after Dimitri had been mentally tormenting him and threatening Cold-Blooded Torture. When Dimitri questions them, they can respond that they couldn't bear to watch the scene.
  • Messianic Archetype:
    • They fit several hallmarks of being a messiah. They are the reincarnation of the local goddess born through a miracle, they are betrayed by a close disciple who goes on to assume a devil-like role, and they rise from death to save the continent in its hour of need. Invoking this is Rhea's goal, who hoped to have Byleth become the Progenitor God in order to bring back the Goddess that the Church preaches can save Fódlan.
    • Ironically, in the Crimson Flower route, despite turning against the church, they still fit this. In that route, they turn against the church due to their loyalty to Edelgard and her goals, which symbolically makes Rhea a false Messiah who proclaims herself the envoy of the Goddess that is defeated by the true Messiah who really has the Goddess with them since it is Sothis who wakes up Byleth.
  • Missing Mom: Their mother died before the events of the game, via giving birth to them.
  • Morality Chain:
    • For Edelgard and Dimitri, as without their guidance (i.e., picking their routes), both become antagonists who will not survive the game. However, should you pick their routes, Edelgard/Dimitri will become more reasonable and stable.
      Edelgard: I want to thank you. Because of you, I feel like I can walk my fated path without losing myself. If I were alone, I might have lost perspective and become a harsh leader with a heart of ice. But I'm not alone. With you by my side, I'm somehow free to be not only a leader, but simply... Edelgard.
      Dimitri: How should I put this... Perhaps it's most accurate to say taught me how to live. If you and I had not reunited on that fateful day, I am certain I would have died a fruitless death on the battlefield. I would have foolishly challenged a horde of foes and, in doing so, needlessly sacrificed the lives of my friends and myself. But now, I have returned to my rightful place. I struggle with what to say, when I know well that words are not enough to express my gratitude. You saved me from the darkness...and guided me back to the light.
    • If they're instructing the Black Eagles house, they also serve as this towards the rest of the Black Eagles, with the exception of Hubert, as they deem their choice to support or oppose the church as the "right" one and will follow suit accordingly, regardless of whether it brings them into conflict with Edelgard or Rhea.
  • Mr. Fanservice: Male Byleth is quite the handsome man.
  • Ms. Fanservice: Female Byleth definitely looks the part, having the second largest bust out of all the female characters, and an outfit that showcases her legs and her figure quite nicely.
  • Mysterious Past: The specifics of their life with Jeralt before coming to the monastery are quite vague, even to themselves. In his C-Support, Seteth asks rather simple questions like "Are you Jeralt Eisner's child?", "How long have you been a mercenary?", and even "How old are you, exactly?" and the most Byleth can give are vague, unsure answers.

    N — Z 
  • Names to Run Away from Really Fast: Meaningful Name aside, who in their right mind would pick a fight with someone who's called the Ashen Demon?
  • Navel Window: Female Byleth has this, distinguishing her armor from her male counterpart.
  • Never Found the Body: Byleth is presumed to have gone missing at the end of Part I, having fallen into a ravine and into a coma for five years.
  • Not Afraid to Die: One of the lines you can choose at the start of the game, after Sothis stops time to save your life, Implies that Byleth doesn't fear death.
  • Not So Above It All: As a sign of their emotional awakening, especially in Part II, they start to get the option to say funny, sarcastic, or snarky lines in various supports, paralogues and even story events. Examples include teasing Edelgard for being cute on Crimson Flower, or suggesting funny disguises for Claude or Hilda on Verdant Wind. Even in Part I they can show a rather deadpan sense of humor at times, or a funny interpretation of a situation.
  • Not So Stoic: Byleth spends most of Part I showing little emotion, but they do not take the death of their father well. They cry for the first time in their life, slumping during the following month and the other characters notice how down Byleth is at the loss.
  • Number Two: On the Crimson Flower, Azure Moon, and Verdant Wind routes, Byleth effectively becomes this to Edelgard, Dimitri and Claude respectively. Silver Snow has Byleth explicitly becoming the leader. Each of the three has a bit of a variant of this:
    • On the Crimson Flower route, Byleth shares the role with Hubert, with Hubert serving as the Empire's tactician while Byleth is the field leader of the Black Eagle Strike Force.
    • On the Azure Moon route, Byleth is the tactician of the Kingdom Army. In a sense, Byleth also has to step up with leading the group due to Dimitri wrestling with his own demons for much of the route.
    • On Verdant Wind Claude is the de facto leader and tactician of the United Forces, with Byleth serving as the general and a figurehead to rally around.
  • Oblivious to Love: Implied Trope.
    • Several S-Support conversations have a character confirm that they had a crush on or fell in love with Byleth either from the moment they met or at some unknown point earlier within the story. In particular, Hapi tells male Byleth that she had a crush on him from the start and Sothis questions whether or not her own feelings somehow influenced Byleth's. This would imply that a Byleth that doesn't S-Support the character in question is either oblivious to or does not requite their feelings.
    • The Goddess Tower Event with Dorothea has her all but say directly that she wants Byleth to be her fated partner but all of Byleth's dialogue options implies that this goes over their head.
  • Oh, Crap!: In the Black Eagles house version of Chapter 12, they respond with a visibly horrified "?!" when the Death Knight arrives. Fortunately for you, he's on your side this time.
  • One-Handed Zweihänder: Byleth's sword, the Sword of the Creator, is a large and extremely long Whip Sword that would require two hands to wield based on size alone, yet both male and female Byleth are capable of swinging it over their shoulder and resting it there with just a single arm. Their artwork also depicts them wielding it one-handed.
  • One Head Taller: Male Byleth to a few of his female love interests. The Female Byleth is 164cm (5'5), making her this to many of her male love interests, and even the male Byleth (who is 175cm tall).
  • One-Man Army: Their leadership, martial skill, and powers from Sothis allow them to decide the fate of the war.
  • OOC Is Serious Business:
    • In her S-support with Dedue, female Byleth drops her usual stoic nature and blurts out a Big "WHAT?!" (without the player even getting a dialogue option to select) when Dedue admits he is leaving Dimitri's service to be with her.
    • Related to the above, certain S-support conversations are pretty much the only time Byleth will say something (still via text rather than voice acted admittedly) without needing the player to prompt/decide their words for them.
    • Overall, you can tell when something is really going sideways when they become emotional over something. This diminishes some as their emotions awaken of course.
  • The Paragon Always Rebels: If they desert the Church to join Edelgard, they can potentially take up to just under three quarters of the student bodynote  and about half of Rhea's best knights with them. Downplayed in that those are just the named, unique students. There are presumably dozens more unnamed students who are just not story important, but Byleth can still rally most of the story important ones.
  • Perpetual Frowner: Due to their stoic nature, Byleth almost always has a disinterested look on their face as their neutral expression, to the point that it's notable when they visibly emote. Said emoting becomes more common over the course of the game as they get in touch with/awaken their emotions.
  • Phlebotinum Rebel: On the Crimson Flower route. They are the end result of Rhea working for over a millennium to create a worthy vessel for Sothis, and they take that power and use it to burn everything she built up to the ground.
  • Physical God: Once Sothis fuses with Byleth, they're granted her powers themselves. This also comes with the added bonus of them being able to utilize the Sword of the Creator's full power as well.
  • Playing with Fire: Byleth is capable of learning Fire, Bolganone, and Ragnarok as they focus on Reason.
  • Power Dyes Your Hair: Byleth's hair and eyes turn from teal and blue to shades of green mirroring Rhea's hair and eyes after Sothis gifts them her power on a greater scale and they basically become one with her as a result. Their colors only return to normal at the end of the Crimson Flower route.
  • Pre-Asskicking One-Liner:
    "Stay focused." (Pre-timeskip)
    "What's my strategy?" (Post-timeskip)
  • Pre-Mortem One-Liner:
    "It's over!"
    "No hesitation!"
    "Allow me to demonstrate!"
    "Let the lesson begin!" (Pre-timeskip)
    "Prepare yourself!" (Post-timeskip)
    "Let this be a lesson!" (Post-timeskip)
    "Here is your answer!" (Post-timeskip)
    "Here is something to believe in!" (Post-timeskip)
  • Propaganda Hero: This comes up in the Verdant Wind route with Claude playing up Byleth's Chosen One status to rally the Knights of Seiros and the Alliance Lords to their cause. Claude does acknowledge how manipulative this is, with Byleth possibly not even being devout, but deems it a necessary evil.
  • Protagonist Powerup Privileges: Only Byleth can access the Enlightened One class.
  • Quit Your Whining:
    • In Bernadetta and Petra's Paralogue, Bernadetta attempts to talk her way out of going with Petra to see her grandfather, since they told her if she were to head somewhere far, she was to take Bernadetta with her. Byleth is not amused when she tries to talk her way out. One of the rare times Byleth will not put up with Bernadetta's excuses.
    • Byleth does this in their Supports with Hilda when she tries to weasel her way out of fighting on the frontlines, much to her's chagrin.
    • When various students tell Byleth their problems, in dialogue or in the note box, you can choose to sympathize or to tell them to suck it up. Which one is the right choice depends on the student and the problem.
  • Rags to Royalty: Most routes have them in a position of power by the end, with Crimson Flower being the only exception. On Verdant Wind and Silver Snow, they're the divinely-inspired new King/Queen of the newly-united Fódlan (with a female Byleth potentially also being Almyra's Queen if she marries Claude), while on Azure Moon, they're formally made the new Archbishop of the Church of Seiros, although a female Byleth can become Dimitri's Queen Consort if paired with him. Crimson Flower is the only exception - while a Byleth of either gender can marry Edelgard and be her consort, most endings involve them either taking on odd jobs or vanishing from history entirely, with the default ending having them fighting alone in Hubert's shadow war with Those Who Slither.
  • Recurring Element: Byleth is the customizable player character and the primary protagonist, making them a combination of the typical Avatar and Lord characters.
  • Red Baron: Called the "Ashen Demon". Dialogue from Hanneman reveals that Byleth got this nickname from their time as a mercenary, being renowned for defeating enemies without so much as a hint of emotion on their face.
  • The Red Mage: They are primarily a sword fighter, but as the Enlightened One they also specialize in white magic and their black magic isn't that bad either.
  • Religious and Mythological Theme Naming: Byleth is Johann Weyer's original spelling of the demon slightly better known as Beleth, a king of Hell in demonology. Fitting for a Black Knight, though somewhat ironic for someone sharing a body with a goddess. The Japanese version uses the more familiar "Beleth" spelling. Sharing a name with a king of hell become more fitting in the Crimson Flower route. Turning against Rhea (while not exactly a god, is a dragon, which are considered deities in Fire Emblem) also convinces a majority of students and members of the church to rebel with them, which mirrors Lucifer's defiance of God and subsequent fall from heaven, taking a number of angels along with him. While it is Edelgard who leads the rebellion, Byleth is the one who Rhea prized the most among her people, and the one whose betrayal she takes the most personally. Fittingly this ties with Edelgard's devil looking armor in the timeskip.
  • Rescue Romance: With each of the lords, should one be S-supported, as they meet when Byleth saves them from a bandit attack at the beginning of the game.
  • Revenge Before Reason: When Jeralt is killed by Kronya, a grieving Byleth swears revenge on her and her mysterious organization. After a lead on them is found, Rhea warns Byleth against doing anything reckless but allows them to deploy. During the battle in the Sealed Forest, Byleth runs right into a trap set by Solon, to the exasperation of Sothis.
  • Sacrificed Basic Skill for Awesome Training: Though a bit more downplayed than most. As they were raised by their mercenary father on the road, Byleth has excellent, well-rounded combat skills and leadership instincts at the start of the game. But because they've never known a life beyond that of a mercenary's and because Jeralt kept the Church at a distance due to his distrust of both it and Rhea until they're roped into service after rescuing the three lords at Remire, they are shockingly naïve about the state of Fódlan and the role of the Church. Even their route's lord has to help them learn how to effectively teach in the early goings.
  • Secret Art:
    • Ruptured Heaven is the Sword of the Creator's combat art, which can only be used by Byleth, which deals 7 extra damage, increases hit and critical by 10, can be attacked at 1 to 2 range, deal bonus damage based on their magic, and deal effective damage against dragons. Upon becoming the Sublime Creator Sword, it becomes Sublime Heaven, which improve the damage by 3 and critical by 10.
    • Since Byleth is the only playable unit to obtain the Sacred Power ability upon mastering Enlightened One, which increases damage dealt by 3 and decreases damage taken by 3 to adjacent allies, this is their exclusive ability.
  • Sensei-chan: Male or female, although Byleth is a teacher, they are treated as more or less like a peer of the students due to their closeness in age. In the Japanese version, the students and faculty of Garreg Mach almost exclusively refer to them as "sensei" no matter the relationship.
  • Sexy Mentor: Both Byleths are noted in-universe as being considered attractive by the students and faculty alike.
  • She Is the King: Played for Laughs during Flayn's S-rank. Since male Byleth inherited Sothis' power, doesn't that technically make him a male goddess?
  • Shock and Awe: Byleth learns the Thunder spell upon reaching D+ in Reason, although it's the only thunder magic they learn.
  • Significant Birth Date: They share the same birthday as Sothis no matter what the player chooses. However, the entry in Jeralt's diary where he discusses his wife's death and Byleth's successive birth is dated the 20th of the Horsebow Moon (9/20), year 1159, regardless of what you've chosen for Byleth's birthday.
  • Spanner in the Works:
    • They blunder into the Flame Emperor's attempted assassination of Edelgard, Dimitri, and Claude (actually just Dimitri and Claude), save their skins, and kickstart their involvement in the plot.
    • In all routes, their presence derails the plans of "those that slither in the dark", with the exact amount varying depending on the route.
    • Amusingly, Byleth is a spanner for everybody by the sheer virtue that they're probably the only character who doesn't have any works for spanners to fall into.
  • The Strategist: They're considered the finest tactician in Fódlan by the time of the war, and even Edelgard and Hubert admit that Byleth's tactical acumen far exceeds theirs.
  • The Stoic:
    • They generally come across as very emotionless. It's explicitly stated in Female Byleth's Forging Bonds event in Heroes that people have told her she lacks emotions ever since she was young because of how hard she is to read. Only a few, like her father and some mercenaries, can discern what's past her expressionless face.
    • Various characters note that Byleth has a very flat and monotone expression and response to most of the topics and situations they're involved in, leading to several characters questioning their nature and actions because of it. Dimitri on the Azure Moon route even admits that he assumed Byleth had no care for their class at first. Deconstructed in that other characters find their lack of emotion so unnatural that they're concerned for Byleth as a person, and Jeralt's journal talks about how Byleth as a baby never cried, something he notes is not right. Averted later, as Byleth begins to develop a healthy amount of emotions and reactions, and Jeralt even notes Byleth is happier around the students, showing that the lack of emotion gradually falls away.
    • Anger is one of the few emotions they can freely express, such as towards Kronya after she murders Jeralt, and a Crest Scholar accusing Marianne of being the Wandering Beast by telling the latter to Get Out!.
  • Stern Teacher: Often perceived as this by their students, due to their stoic nature.
  • Strong Family Resemblance: The Cindered Shadows DLC includes a CG that shows their mother in person. While both Byleths clearly inherited more of their looks from Sitri than Jeralt, female Byleth in particular is practically her spitting image.
  • Suddenly Speaking:
    • Male Byleth actually speaks when S-supporting with Annette, textbox and all, instead of the usual silent dialogue options. Same with Female Byleth in Dedue's S-Support.
    • Fire Emblem Heroes gives Byleth actual dialogue, both voiced and unvoiced.
  • Supporting Protagonist: Byleth's status as the lead generally downplays itself during the second half of the game, although the degree it goes down depends on the route. The only route where they're still the lead is the Silver Snow route, as it involves them (and the rest of the Black Eagles who aren't Hubert) rejecting Edelgard's invasion and designs for the continent at large. On this route, since Byleth is not bound to any of the three countries, they're more directly aligned with the Church of Seiros, and the story follows Byleth and whichever allies they've made trying to stop the Empire's invasion and repair the damage they've done.
    • On the Azure Moon route, Byleth isn't played up as The Chosen One like past avatars; Dimitri is. The plot heavily focuses on him coming to terms with his trauma and mental illness to become a heroic savior who frees his people and ends the war. Byleth's role is to simply help him on the journey.
    • On the Verdant Wind route, Byleth's status as the Church's divinely empowered Archbishop is crucial to Claude's plans to dragging Fódlan into a new era of openness; Claude's the one mainly calling the shots diplomatically and strategically.
    • On the Crimson Flower route, it's Edelgard's ideals and ambitions for Fódlan's future that drive the plot, and Byleth mostly exists as her enforcer and Morality Chain.
  • Suspiciously Similar Substitute: Of Ike. Both are children of mercenaries, raised to that life but otherwise sheltered from the wider world, to the point that both of them are clueless about what should be basic knowledge of their world—Ike has never heard of the Laguz, and Byleth has never heard of the Church of Seiros. Both are no-nonsense, level-headed swordfighters who rarely let their emotions affect them, but both go into a blind rage after the death of their father and need to be bailed out of a bad situation as a result. Both were affected emotionally and mentally by the chief follower of their world's goddess as children—Byleth was implanted with a crest stone to save their life, while Sephiran wiped out Ike's memories of his father killing his mother in a berserk rage to save his sanity. Both start out as untested leaders, and end up proving themselves to be so skilled at the role they literally turn the tides of war, serving as advisors and generals to the leaders of whole countries. Both of them wield goddess-empowered swords as their iconic weapons, and both are eventually empowered by a goddess directly. The cherry on top? Jeralt, Byleth's father, is a substitute for Greil, Ike's father.
  • Symbiotic Possession: Rhea intended to use Byleth's body as a vessel for Sothis's soul to escape from its Soul Jar, but Byleth had their own soul and it ended up a mix of this trope and Sharing a Body, with Byleth having control over the body. On most routes, Rhea comes to accept Sothis' disappearance and Byleth's status, only rejecting it wholesale on the Crimson Flower route due to siding with the one student who not only intends to do away with the Nabateans, but is also complacent with many of the events Those Who Slither helped instigate.
  • Tangled Family Tree: Byleth's origin is rather... complicated. They were born of an artificial human given life by Sothis’s heart in an attempt to create a vessel for Sothis, and a human who Rhea transfused her blood to in order to save his life and grant him her Crest of Seiros. The combination also made them the ideal vessel to house Sothis’ consciousness and while all this practically made Byleth a Nabatean, it appeared to stop short of actually making Byleth relatives to them. This evident in that Seteth only mentions Byleth could "become" their kin depending on how they develop. Flayn in particular notes in their support that they can sense something familiar in Byleth, and raises the possibility of being distantly related to them (and later recognizes they both have special blood and must have similarly unique origins), though in their S-support there are implications that it is Sothis she was sensing as she asks for assurance that Byleth is not actually Sothis before accepting their proposal.
  • Tarot Motifs: Byleth of either gender represents the World Arcana, represented in-universe by the Crest of Flames and can represent possibilities and successful conclusions. This represents the fact that Byleth, as the Author Avatar, can choose any house and that whichever house Byleth chose at first will be the army that wins the war by the end.
  • Teacher/Student Romance: After the timeskip, Byleth will be able to hook up with their former students.
  • Time Master: Thanks to receiving power from Sothis, they have a limited ability to manipulate time, such as being able to stop and even turn it back. However, they can only turn back time so far, it's possible to interrupt them, and while time is stopped, they can't move either, though they are free mentally to assess the situation in order to plan out what they're going to do next when they release it.
  • Tragic Keepsake: The only thing left of their mother is a ring, which their father intends to give to them someday, to share with someone they love. In their S support ranks, they invariably do just that.
  • Unable to Cry: From birth, Byleth as a baby was unable to cry, and that worried Jeralt. Only when Jeralt dies does Byleth shed tears for him.
  • Unskilled, but Strong: Byleth can quickly have their weapon aptitudes surpassed by their students, as they gain skill experience every week while Byleth doesn't (especially at first, when their Professor Level is low), and is notably harder to raise their aptitudes as a result. In addition, trying to recruit every playable character in the game can quickly turn them into a Master of None throughout Part I. However, they have the highest base stats in the game, and is tied for 3rd highest growth rate with Claude.
  • Vague Age: Unlike most other recruitable characters that have canon ages, Byleth’s age is listed as "??". However, going by how Byleth was born around the time that Jeralt left the Knights of Seiros, it can be summarized that they're at the very least 20-21 years old when the game starts. The students do note that Byleth isn't that much older than them, just to hammer down how young they are. Jeralt's journal reveals that their real birthdate is the 20th of the Horsebow Moon (September 20th) in 1159. Datamining reveals that these are the defaults set in the game code as well, but their default age is given as 21 instead of 20. It becomes more complicated post-timeskip since Byleth hasn't aged due to Sothis's fusion, and depending on how the coma worked, time may have not passed for them at all. Cindered Shadows states that Byleth is around 21 at the start of the game: Sitri, Byleth's mother, is stated to have died 21 years before the DLC begins.
  • The Watson: While they are an experienced mercenary, they are an outsider to the political and religious workings of Fódlan. This allows the lord character to explain such things to them, and by extension the player.
  • What Beautiful Eyes!: During her A-Support dialogue, Rhea swoons over Byleth's newly-changed green hair and "beautiful shining eyes". Though the implications are certainly romantic, Rhea is actually drawn to them because they are clear signs that Byleth is becoming a Nabatean and thus a more suitable host for Sothis.
  • When She Smiles: Due to their status as The Stoic, when they do smile, it will be commented on or acknowledged in some way; Dimitri even describes Byleth's smile as "mesmerizing."
  • Whip Sword: Their Weapon of Choice, the Sword of the Creator, can transform into a giant chain whip for ranged attacks.
  • Who Wears Short Shorts?: Female Byleth wears black short shorts paired with lace leggings. Concept art shows that she might have also foregone the shorts at some point early in development, before the tights were added.
  • Workaholic: Implied. Several supports have characters admonishing them for working too hard, even students who work too hard themselves.
  • Would Hurt a Child: On the Azure Moon route, they kill the teenaged Fleche without a hint of hesitation or regret, after she mortally wounds Rodrigue in an attempt to kill Dimitri in revenge for her brother's death.
  • Wrong Side All Along: Siding with the Empire over the Church effectively means deciding this trope is in play in regards to Rhea and the Flame Emperor, which is enforced further to a degree as an interview noted that Three Houses' worldbuilding favors Silver Snow's lore.
  • You Are in Command Now: On all routes other than Crimson Flower, with Rhea out of action for nearly all of Part II, the members of the Church of Seiros defer to Byleth's leadership.
  • You Gotta Have Blue Hair: Like many protagonists before them, Byleth has blue hair (although it’s a unique teal shade this time around). The greenish shades of it are probably linked to the fact that their mother was a clone of Sothis.
  • Young Conqueror: On the Verdant Wind and the Silver Snow route, Byleth ends up conquering the Empire, and with the Kingdom and Alliance in no state to govern themselves and desiring Byleth's leadership, ends up uniting all of Fódlan under their rule. Special mention goes to the Verdant Wind route, where Byleth and Claude eventually plan to unite Fódlan with neighboring countries; should you achieve S-rank support with Claude, he even returns to save Fódlan from a resurgence of Imperial and Agarthan remnants and apparently marries Byleth, effectively uniting the two regions as one.


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