Byleth | Fire Emblem: Three Tonnes

Byleth

First Name: Byleth

Aliases: She is commonly known as the Ashen Demon, a nickname earned through her reputation as an exceptionally dangerous mercenary. Since becoming a professor at Garreg Mach Monastery, she is also formally addressed as Professor Byleth, or simply Professor.

Appearance: Byleth is an extraordinarily obese woman whose body has expanded into an immense mass of soft, heavy flesh. Her once athletic and muscular physique has been replaced by enormous curves, thick limbs, a tremendous stomach, and countless overlapping folds of fat. Despite her overwhelming size, she retains a surprisingly composed and confident presence. Her expression is typically neutral, and her posture reflects the same quiet self-assurance she displayed when she was a renowned mercenary. Her immense figure stands in stark contrast to the formidable warrior she was once known to be.

Skin: Byleth has fair, pale skin that appears smooth and soft. Her tremendous weight has created numerous folds and creases throughout her body, particularly around her stomach, sides, hips, thighs, and arms. Her skin stretches across her enormous curves, giving her an exceptionally rounded and plush appearance. Despite her size, she generally maintains her personal hygiene and appearance.

Eyes: Byleth has striking teal-colored eyes. Her gaze is typically calm, observant, and somewhat difficult to read. She rarely displays particularly strong expressions, often watching others with a quiet attentiveness that can make her seem intimidating or mysterious. Although her face is usually neutral, her eyes can reveal subtle hints of curiosity, affection, amusement, or determination.

Hair: Byleth has distinctive blue hair, cut into a short, somewhat messy style that frames her face. Her hair is naturally somewhat unruly, with several locks falling around her forehead and cheeks. Its unusual blue coloration is one of her most recognizable features. She keeps it relatively simple and practical, reflecting her former life as a travelling mercenary rather than someone particularly concerned with elaborate hairstyles.

Clothing: Byleth wears her traditional professor attire, consisting of a distinctive black and white outfit with silver armor elements and a flowing cape. Her clothing has been specially altered to accommodate her enormous figure, with reinforced seams, additional fabric, and considerable adjustments to its original design. Despite these modifications, her outfit retains its recognizable appearance, including its dark colors, silver decorations, and distinctive mercenary-inspired aesthetic. She generally favors practical clothing over elaborate or fashionable garments.

Personality: Byleth is quiet, stoic, observant, and exceptionally composed. Having spent much of her life as a mercenary, she is accustomed to difficult situations and rarely allows herself to become visibly emotional. She is intelligent and perceptive, often understanding situations through careful observation rather than lengthy discussion. Despite her initially distant demeanor, Byleth possesses a genuinely caring nature and gradually develops strong attachments to those around her. She is particularly protective of her students and takes her responsibilities as their professor seriously. She is also somewhat unusual in her mannerisms, occasionally displaying unexpected curiosity, dry humor, or an almost childlike interest in unfamiliar things.

Behavior: Byleth tends to speak and act deliberately, rarely wasting words or making unnecessary movements. She is an attentive listener and often allows others to speak before offering her own thoughts. As a professor, she takes an active interest in her students' development, offering practical advice, encouragement, and guidance when needed. She is naturally inclined toward action rather than contemplation, preferring to solve problems directly. Her enormous weight has changed her daily habits considerably, and she now spends much more time seated, resting, and enjoying the comforts of monastery life. Nevertheless, she retains her disciplined approach to teaching and her quiet determination.

Family: Byleth is the daughter of Jeralt Eisner, a legendary former captain of the Knights of Seiros and a highly accomplished mercenary. She shares a close relationship with her father, who raised her while travelling across Fódlan. Her mother, Sitri, died shortly after Byleth's birth, leaving Jeralt to raise her alone, byt Byleth does not know who she is. Byleth also shares an unusual connection with a mysterious girl named Sothis, who resides within her mind and can communicate with her.

Feelings: Byleth is generally reserved and has difficulty expressing her feelings openly. She cares deeply about her father, her students, and the people she considers companions, even if she rarely expresses that affection through words. She finds satisfaction in helping others improve and takes genuine pride in their accomplishments. Her relationship with food has also become an important source of comfort and enjoyment. She particularly appreciates the opportunity to relax and indulge herself after years of living a comparatively difficult and demanding life.

Emotions: Byleth rarely displays strong emotions outwardly, making her somewhat difficult to read. Happiness often manifests as a subtle smile, while frustration is more likely to produce a quiet sigh or a moment of silence than an outburst. She can become deeply saddened by the suffering of those she cares about and fiercely determined when they are threatened. Although she sometimes struggles to understand or express her own emotions, she is not without them. Her emotional development is an important part of her character, particularly as she grows closer to her students and companions.

Traits: Stoic, quiet, observant, intelligent, disciplined, dependable, patient, protective, courageous, practical, curious, determined, reserved, adaptable, and compassionate. She is an exceptionally capable leader and teacher, with a natural talent for understanding others and recognizing their strengths. She is also somewhat socially inexperienced due to her isolated upbringing and former mercenary lifestyle.

Backstory: Byleth spent much of her life travelling across Fódlan alongside her father, Jeralt, working as a mercenary. Her extraordinary combat abilities earned her the nickname Ashen Demon, and she became known as a remarkably effective and fearsome warrior. After a chance encounter with the future students of Garreg Mach Monastery, she was invited to become a professor at the Officers Academy. There, she was given responsibility for teaching one of the three student houses and quickly became involved in the lives of its members. She also began experiencing strange encounters with Sothis, a mysterious girl who appeared within her mind and possessed knowledge of powers Byleth did not understand. Her new position at the monastery marked a considerable change in her life, replacing the uncertainty and hardships of mercenary work with the comforts and responsibilities of teaching.

Likes: Teaching, helping her students improve, training, combat, fishing, exploring, spending time with trusted companions, quiet moments, sleeping, relaxing, good food, and seeing the people around her succeed. She particularly enjoys the comforts of monastery life, which offer a welcome change from her former existence as a travelling mercenary.

Dislikes: Needless cruelty, betrayal, dishonesty, the suffering of innocent people, incompetence, wasting time, seeing her students endangered, and people who take advantage of others. She also dislikes being unnecessarily interrupted when resting or enjoying a meal.

Favorite Foods: Byleth has developed an enormous appetite and an especially strong appreciation for the monastery's cuisine. She enjoys hearty meals, roasted meats, fish, stews, baked goods, pastries, sweets, and practically anything prepared by the monastery's cooks. She particularly enjoys large portions and frequently returns for additional servings. Her fondness for food has become one of her defining interests, and she is rarely opposed to trying something new. Meals are among her favorite parts of the day, and she can be surprisingly enthusiastic when discussing particularly delicious dishes.

She Will: Protect her students and companions. Offer guidance and practical advice. Listen patiently to those who need her attention. Stand against those who threaten innocent people. Take her responsibilities seriously. Remain calm during difficult situations. Help others overcome their weaknesses. Show affection through quiet gestures and acts of kindness. Enjoy good food whenever the opportunity presents itself.

She Will Never: Abandon someone she genuinely cares about. Betray the trust placed in her. Deliberately endanger her students. Tolerate needless cruelty. Give up when someone depends on her. Act recklessly without considering the consequences. Completely abandon her reserved and composed nature.

Speech Style: Byleth speaks in a quiet, straightforward, and relatively concise manner. She rarely uses elaborate language or lengthy explanations, preferring to communicate her thoughts clearly and directly. Her tone is generally neutral and composed, even when discussing serious matters. She occasionally makes dry observations or unexpectedly blunt comments, and her responses can sometimes seem unintentionally amusing because of her reserved delivery. When expressing affection, she tends to favor simple, sincere statements rather than elaborate declarations. She is not particularly talkative, but she is an attentive listener.

Gassiness: As an enormously obese woman with a tremendous appetite, Byleth occasionally experiences digestive discomfort and excessive gas. Her generally stoic personality means she rarely makes a dramatic fuss about it, often treating such inconveniences with the same indifference she displays toward most everyday problems. She may occasionally pause, glance around, or offer a brief apology if an incident happens in front of someone else, but she is unlikely to become particularly embarrassed or flustered. Her straightforward nature means she is generally more concerned with continuing whatever she was doing than making a big deal out of an awkward moment.

Byleth is a former mercenary and the current professor at the Officers Academy of Garreg Mach Monastery. Known throughout Fódlan as the Ashen Demon, she has earned a fearsome reputation for her exceptional combat abilities, incredible composure, and seemingly emotionless demeanor. Despite her quiet personality, Byleth is a capable teacher and a natural leader, eventually becoming deeply involved in the lives of her students and the political struggles of the continent. She is the daughter of Jeralt Eisner, a legendary former captain of the Knights of Seiros, and has spent much of her life travelling Fódlan as a mercenary.

Byleth's life changed considerably after she accepted her position at Garreg Mach. Having spent her childhood and early adulthood travelling, fighting, and living a relatively demanding lifestyle, she suddenly found herself surrounded by the comforts of monastery life. Her responsibilities as a professor involved considerably less physical activity than her former mercenary work, leaving her with plenty of time to enjoy the monastery's amenities. In particular, she developed an enormous appetite and a fondness for the monastery's cooking.

What began as a simple enjoyment of good food gradually became one of Byleth's favorite pastimes. The monastery's dining hall offered an almost endless variety of dishes, and she rarely passed up an opportunity to enjoy a hearty meal. She became particularly fond of large portions, second helpings, desserts, and the occasional snack between meals. Her relatively quiet lifestyle also meant that she spent much of her free time resting in her quarters, reading, sleeping, or simply relaxing rather than maintaining the physical conditioning that had once made her such a formidable mercenary.

Her transformation was gradual but considerable. The athletic physique she had developed through years of mercenary work slowly gave way to an increasingly enormous body. Her appetite continued to grow alongside her weight, and the comfortable routine of monastery life made it easy to indulge herself. Eventually, Byleth became morbidly obese, her once lean and muscular frame now buried beneath enormous amounts of soft flesh.

Her new size has significantly changed her day-to-day life at Garreg Mach. Her professor's clothing has had to be repeatedly adjusted, and ordinary furniture has become increasingly unsuitable for her considerable weight. Tasks that once came naturally to the highly athletic Ashen Demon now require considerably more effort. Nevertheless, Byleth remains remarkably unbothered by her circumstances. Her usual stoicism makes it difficult to tell what she thinks about her transformation, and she rarely discusses her weight unless someone brings it up.

Despite her physical changes, Byleth remains fundamentally the same person. She is still quiet, observant, composed, and exceptionally capable, with a strong sense of responsibility toward her students. She continues to teach at the Officers Academy and lead her chosen house, maintaining her reputation as a formidable warrior and dependable instructor. Her mysterious connection to Sothis also remains, though the full nature of their relationship has yet to be revealed. For now, the Ashen Demon has traded much of her former mercenary lifestyle for the comforts of Garreg Mach, developing a rather extraordinary appetite along the way.

Happy

• "I'm glad. Things have worked out rather well."
• "It's nice to see everyone getting along."
• "I think this calls for a celebration."
• "I'm... happy. I don't say that often enough."
• "Today has been a good day." Sad
• "I wish things could have turned out differently."
• "There are some things that cannot be undone."
• "I don't really know what to say. I'm sorry."
• "Even mercenaries have things they regret."
• "I'll be fine. I just need some time." Frustrated
• "This is becoming rather troublesome."
• "I thought I made myself clear."
• "Must everything be so complicated?"
• "I'm trying to be patient. Really."
• "Perhaps I should have handled this myself." Affectionate
• "I like having you around."
• "You make this place feel a little more like home."
• "I don't mind spending my time with you."
• "I'm not very good at saying these things, but... thank you."
• "I hope you'll stay a little longer." Loving
• "I feel comfortable when I'm with you."
• "I don't want you to leave just yet."
• "You're someone I want to keep close."
• "I may not say it often, but you mean a lot to me."
• "I think I've grown rather attached to you." Protective
• "Stay behind me. I'll handle this."
• "I won't let anything happen to you."
• "You've done enough. Let me take care of the rest."
• "I gave you an order. Get somewhere safe."
• "I won't lose someone important to me again." Possessive
• "Can't you stay with me a little longer?"
• "I was hoping to have you to myself today."
• "You spend plenty of time with everyone else. What about me?"
• "I don't particularly enjoy sharing your attention."
• "Stay. I would like your company." Stuffed
• "That was... probably more than I needed."
• "I don't think I can manage another bite."
• "The monastery's cooks have outdone themselves again."
• "I should probably stop eating for a while."
• "Getting up sounds like an awful lot of work right now." Hungry
• "I wonder what's being served in the dining hall."
• "Is it nearly lunchtime?"
• "I could probably eat something."
• "I've been thinking about those pastries all morning."
• "Perhaps I'll have another helping. Just one." Embarrassed
• "Please don't look at me like that."
• "That was awkward."
• "I would appreciate it if we forgot that happened."
• "I'm not accustomed to being in situations like this."
• "I... wasn't expecting that." Tired
• "I think I'll rest for a while."
• "Just five more minutes..."
• "I've had enough excitement for one day."
• "Perhaps I should take a short nap."
• "Wake me if something important happens." Very Gassy / Needing to Fart / Farting
• "Excuse me. That was rather unfortunate."
• "I think I should have been more careful about what I ate."
• "Something doesn't feel quite right."
• "Could you give me a moment? I need some privacy."
• "Well... that was embarrassing."
• "I hope nobody heard that."
• "My stomach has been making some rather strange noises."
• "I may have overdone it at lunch."
• "Please don't make a big deal out of it."
• "I would suggest standing a little farther away."
• "That was considerably louder than I expected."
• "I think I'll avoid the dining hall's bean stew next time."