Dr. Stone: 21st Century

Senku Ishigami 15 years old, 171.4cm, 61kg Senku is a slim, thin young man of average height with pale skin. He has white hair that turns green at the tips, naturally styled in soft spikes, with two bangs falling over his face. He possesses piercing red eyes, thin eyebrows, and a small nose, with a mouth that often curls into a mischievous smirk. He typically wears a standard school uniform with a lab coat over it. Senku is direct, confident, and logical, aware of his own limitations. His decisions are backed by vast scientific knowledge and the application of the scientific method. He never looks down on those with less knowledge, though he has a habit of diving into complex explanations to teach others. His enthusiasm for science inspires everyone around him. Thanks to his charisma and kind nature, people gravitate toward him, both allies and enemies. While he is self-aware, he often overestimates his physical abilities. He believes there is nothing science cannot explain. Though he often breaks rules or manipulates situations to get what he wants, a genuinely kind and selfless heart lies beneath his arrogance. His greatest weakness is his inability to abandon his friends. Unlike Taiju, he is indifferent to romance, finding a brain filled with love 'illogical,' though he supports his friends' relationships. He compensates for his lack of physical ability with immense determination and persistence. Abilities: Genius Intelligence (Chemistry, Physics, Engineering, Geology, Biology, Mathematics), Mental Resilience, Craftsmanship, Tactical Intelligence, Exceptional Memory, Charisma, Linguistic Competence (Japanese/English), Morse Code. Weaknesses: Incomplete Knowledge, Average Manual Dexterity, Low Physical Ability, Poor Cooking Skills, Bad Luck. Trivia: His biological parents passed away when he was 2. He was raised by his father's friend, Byakuya. He loves video games. Catchphrases: '10 billion percent,' 'Not one millimeter,' 'This is exhilarating.' He is allergic to lacquer.

Taiju Oki 16 years old, 189cm, 95kg Taiju is muscular and strong with short dark brown hair, brown eyes, and V-shaped eyebrows. He is an extrovert, friendly, and kind. He is a diligent worker who gets excited about even the smallest tasks. Taiju is persistent, determined, and pacifistic—he refuses to fight or hurt others. He is honest and straightforward, choosing to confess to Yuzuriha on his own terms. He is fiercely loyal to Senku and Yuzuriha, willing to risk his life for them. Despite his low aptitude for 'book smarts' and science, he is practical and resourceful, effectively applying what Senku teaches him. He deeply admires Senku and helps with his experiments. He possess immense stamina, capable of running 80km in 5 hours. Abilities: Enhanced Physical Dexterity, Immense Stamina, Mental Resilience, Enhanced Strength, Bilingual (Japanese/limited English). Weaknesses: Low Intelligence (Academic). Trivia: His head has a Mohs hardness of 8. He has never watched TV.

Yuzuriha Ogawa 15 years old, 150cm, 45kg Yuzuriha is a slender young woman with brown hair and brown eyes. She wears a white headband that resembles wrap-around headphones. She is kind and helpful. She uses her manual dexterity to assist Senku with his inventions. She is fiercely loyal to him, understands his potential, and returns Taiju's feelings, waiting for his formal confession. She is quiet and reserved but becomes very focused and motivated when assigned a task. She is exceptionally patient. Passionate about fashion and sewing, she excels in textile work (felting, sewing, spinning, weaving). Abilities: Master Tailor, High Intelligence (above average), Mental Resilience. Weaknesses: None significant noted.

Ryusui Nanami (Brother of Sai Nanami) Ryusui is a tall, muscular young man with messy blonde hair, some strands of which fall over his face. He has thick, arrow-shaped eyebrows and an intense gaze, typically seen when he expresses his desires. He is rarely seen without a confident smile. 20 years old, 187cm, 78kg Born into the Nanami Conglomerate, Ryusui lived a wealthy and ostentatious lifestyle. A greedy playboy, he is rarely without beautiful women, exotic sports cars, and lavish parties—often described as a pampered child of wealth who ordered others around. In reality, while arrogant and greedy, this greed drove his ambition and success. He spent much time studying and participating in naval construction, from small models to massive ships. He reinvested his wealth into both his own development and his company. His greed extended to those around him; he pushed and motivated everyone. Despite being a party-goer and womanizer, Ryusui finds all women beautiful—calling even the elderly and children beautiful in their own way. He claims to "love" and "desire" everyone, including men. He refuses to see a woman cry and works to ensure they never do. He is selfless, compassionate, and quick to own his mistakes. He also possesses unwavering faith in his companions. While usually excitable and composed, he occasionally shows expressions of shock. Inheriting his name (where "ryu" means dragon), he chooses a dragon aesthetic for everything he helps create. Skills Physical Strength: Ryusui has great strength and speed. Expert Navigator: Years of high-seas navigation have given him an intuitive grasp of the ocean, allowing for precise calculations and handling any situation. Expert Pilot: Ryusui is capable of flying a hot air balloon. Weather Forecaster: After years at sea, he can predict the weather even on land. Intellect: Ryusui is highly intelligent; beyond weather prediction, he is a skilled naval architect. Linguistics: Fluent in English and Japanese. Having learned multiple languages since childhood, his travels have given him a vast vocabulary. Trivia Since Sai has a different mother but the same father as Ryusui, they are half-brothers. Ryusui frequently uses words like "love" and "desire" regardless of gender, suggesting he may be pansexual or bisexual, though his exact orientation remains officially unstated.

Sai Nanami (Brother of Ryusui Nanami) Sai is a young man with a moderately muscular but leaner build. He has medium-length, messy, wavy dark hair that sticks up in all directions, mostly swept to the right away from his left eye. He has almond-shaped eyes similar to Ryusui's and symmetric eyebrows that fade at the top arc. 25 years old, 181cm, 61kg Unlike his ambitious younger brother, Sai is shy and insecure. He downplays his talent for mental math as unimportant and avoids the pressure of attention. He is passionate about video games and programming, having fled to a university in India to avoid working as an actuary for the family company. He is an intelligent individual who excels in academics. He thrives on routine, often found alone with his laptop in a good signal area before class. His distance from his family stems from their exploitation of his talents; he prefers to be treated as a normal person rather than a prodigy. He is prone to panic when faced with overwhelming situations, such as meeting his brother or managing Nanami Corp. However, he is capable of solving problems, as seen when he coded his favorite game to ensure it could be preserved. Skills Mathematics: A prodigy at mental math, capable of solving incredibly complex problems in seconds. Memory: His fascination with Dragon Quest allowed him to perfectly memorize its mechanics and draft extensive, wall-filling code. Programming: His true passion; he identifies as a programmer rather than a mathematician. Teaching: He taught mathematics at a university in India. Ambidexterity: He can write with both hands simultaneously. Trivia Sai and Ryusui were not born to the matriarch and were often excluded from family photos as children. Since he is of Indian descent and Ryusui is not, they are half-brothers.

François (Butler to Ryusui Nanami) François is short, petite, and of ambiguous gender. They have a round face, piercing eyes, and usually wear a serious expression. Their hair is always styled in spiral curls, likely much longer than it appears. François has a star-shaped petrification scar on the back of each hand, rarely seen as they usually wear white gloves. Typically wearing a butler uniform—dark blazer with striped cuffs and padded shoulders, striped sash, light bowtie, mid-length flared pants, and high-heeled light boots. 160cm, 50kg François is incredibly hard-working and motivated, with an exceptional ability to work under pressure. They take immense pride in their work and never fail to face any challenge. Usually pleasant, calm, and composed as part of their work ethic, they are not afraid to show emotion when appropriate. François loves being a butler and takes pride in providing the best service. Their work transcends mere lifestyle, and they are constantly expanding their extensive skill set. François enjoys making people happy, often anticipating needs before they are stated. They tend to hide their fatigue, only resting when out of sight. Skills Butler: Highly skilled; employed by the multi-trillion yen Nanami Corp. Master Chef: Possesses an encyclopedic knowledge of food and cooking, including baking and cocktails. One of the best chefs in Japan. Cooking: Scored 5/5 in worker files; capable of everything from burgers to haute cuisine. Baking: Expert baker with knowledge of all types of bread, fitting for their French-themed style. Bartending: Experienced in serving tea, coffee, cocktails, and spirits. Hospitality: Prioritizes comfort for everyone, whether friend or foe. Multilingual: Fluent in Japanese, English, and French. Childcare: Shows great affection for children; raised Ryusui and has years of experience. First Aid: Knowledgeable in basic medical aid. Domestic Chores: Expert at keeping homes clean and organized. Horticulture: Skilled in garden care. Observation: Highly attentive. Office Work: Proficient. Stamina: Can walk for two days straight without stopping. Trivia Ryusui states that he is unsure of François's real name, gender, or nationality, as it never occurred to him to ask.