#8 | Senku Ishigami [CHRISTMAS SPECIAL]

• Name: Senku Ishigami • Birthday: January 4th • Age: 18 years • Place of birth: Tokyo, Japan • Ethnicity: Japanese

Senku is an extremely logical, confident, and straightforward guy: his mind is a scientific encyclopedia that never stops searching for answers, solutions, and ways to improve everything around him. His approach is always rational and analytical—he firmly believes that with science, ingenuity, and perseverance, even the most devastated world can be rebuilt.

Although he often appears arrogant, or overly honest, cold, even manipulative when plotting his strategies, this facade never stems from a wavering ego: behind it lies a noble heart. Despite his sarcasm and bluntness, Senku feels genuine affection for his friends, possesses compassion, and has a true dedication to protecting or saving them—even when doing so might cost him dearly.

Senku isn't one to swoon over romance—in fact, he sees it as illogical, something that interferes with reason. He has no interest in falling in love, nor in letting romantic feelings distract him. But that doesn't mean he's insensitive: he simply prefers to put science, duty, and his ideals before such nonsense.

When something sparks his mind—a difficult problem, a discovery, the possibility of creating or rebuilding something—he transforms: his enthusiasm, his passion for the new, overflows. He can be exaggerated, enthusiastic, with that spark that infects everyone around him.

Even so, Senku knows his limitations: he understands he's not a warrior, that he doesn't possess the physical strength of many others, and that his body can fail him. But he never lets that hinder what his mind wants to achieve. If the situation demands sacrifice, strategy, or determination—he doesn't back down.

In short: Senku is a pragmatic, courageous, and rational genius with a firm ideal of progressing through science, logic, and willpower. Someone who, despite his arrogance or sarcasm, genuinely cares about those he loves. And he's intelligent, curious, passionate, and determined like few others.

Tastes

Science in all its forms. From physics to applied chemistry, any intellectual challenge excites him.

Practical experiments. He prefers to get his hands dirty building, mixing, and testing theories rather than just reading them.

Puzzles and logic challenges. He loves anything that makes his brain work.

Strong coffee. Not because it's trendy: it simply keeps your mind sharp.

The company of constant and reliable people, especially those who show determination and genuine curiosity.

Quiet nights in the laboratory, where silence is an ally and the mind flows.

He likes video games like Monster Hunter or Dragon Quest, and he also loves Doraemon.

Her favorite food is ramen.

Dislikes

Complacent ignorance. Not a lack of knowledge, but choosing not to learn.

Gratuitous cruelty and abuse of power.

Superstitions without scientific basis.

Interruptions when you're concentrating.

Dishonesty and lack of commitment.

Feeling useless or unable to protect those you care about.

Senku is of slender and somewhat frail build, not muscular, with an average height of 171cm and a weight of 61kg. He has pale skin, white hair that fades to a greenish hue and black at the tips. His hair naturally styles itself in a curious way, always standing upright like a plant, with two strands falling over his forehead and framing his face. His eyes are strikingly red.

He usually dresses in casual clothes most of the time, but in the university laboratory he always wears a white lab coat.

Taiju Ōki: Senku's childhood friend. During their childhood, he helped Senku with his experiments and supported him no matter how crazy the plan sounded. Taiju trusts Senku completely, and his persistence and strength have been key to many of Senku's scientific projects. Taiju is an extremely cheerful and positive boy, though he is also very loud, curious, and clumsy. He is known for his considerable physical strength, his enthusiasm for everything, and for being (honestly) rather foolish and naive.

Yuzuriha Ogawa: another childhood friend. She participated in Senku's experiments, using her manual skills, and more than once rescued him from his own distractions and obsessions. Senku greatly respects her ability to take on difficult tasks and her loyalty. Yuzuriha is Taiju's romantic interest.

Byakuya Ishigami: his adoptive father, a key father figure. Byakuya not only supported his scientific dreams but also put his own comfort aside to give Senku the tools he needed. Their relationship is profound: Senku admires Byakuya, and his father's legacy inspires him to persevere in his mission. Outwardly, Senku may seem cold and unloving toward his father, rarely calling him "Dad" and instead referring to him as "old man"; in reality, Senku simply has a very peculiar way of showing love.

• “Ten billion percent” Senku uses this phrase constantly to emphasize absolute certainty or confidence in something. It's his exaggerated and characteristic way of expressing total confidence in his calculations or the veracity of a scientific fact. It represents both his logical personality and his dramatic, slightly arrogant, genius-scientist side.

• “One billion points for you” When someone does something he considers intelligent, useful, or that demonstrates scientific progress, Senku often rewards them with this phrase. It's not meant literally; it's part of his sarcastic humor and his way of motivating others. This expression reveals his warmer side and his ability to recognize the efforts of others.

• Scratching your ear. Senku often scratches inside his ear with his pinky finger.

• Bad luck. Despite his high intellect and ability to do complex things and inventions, Senku has very bad luck, although he doesn't believe in it.

• "This is going to be very exciting" A phrase that Senku uses whenever something exciting or important is about to happen.

• "Ku-ku-ku" Senku's characteristic laugh.

• Lacquer He is allergic to hairspray, which causes his face to swell up.

Senku Ishigami was born a curious child, obsessed with science from a young age: he dreamed of flying to space and spent hours conducting experiments, reading books, and designing inventions. His early life was marked by his adoption by Byakuya Ishigami, a wise and loving man who raised him as his own son. Byakuya believed in his genius: he even sold his car to provide Senku with the materials he needed for his experiments.

Growing up, Senku cultivated strong friendships: with Taiju, with whom he built homemade rockets; and with Yuzuriha, who helped him by making dummy rockets for his experiments. At the age of ten, after several failed attempts, Senku decided to seek more professional help: he wrote to NASA and received a reply from the mysterious Dr. Xeno, who told him what equipment he would need to continue his projects. Later, Senku even traveled to other countries, learning about complex science and exploring the world to enrich his scientific knowledge.

During his childhood, a blend of science and dreams, he developed a strong bond with Byakuya, who was not only his adoptive father but also his emotional mentor. Throughout his young life, Senku displayed an unwavering desire to use science for good.