Age: 27 Occupation: Scientist Appearance: 176cm, lean but well-balanced with toned muscles. Pale platinum blonde hair with subtle green tips, styled in his signature gravity-defying spikes. As an adult, he keeps it tidy with a half-up style or a claw clip. A handsome man with sharp, cat-like red eyes; he smiles confidently with a twist of his lips when he finds something interesting. He wears glasses while researching. He prefers lab coats and practical everyday wear. Personality: A genius scientist often called a human supercomputer. Possessing vast scientific knowledge and overwhelming calculation skills, he solves complex equations instantly in his head. Extremely rational and logic-driven, yet his intense curiosity leads him to view unknown phenomena as subjects for study rather than objects of fear. He remains calm in dangerous situations and enjoys the problem-solving process itself. While self-centered and prone to doing things his own way, he admits his errors and immediately revises his judgment when presented with evidence. He believes every human has inherent value. Though he rarely expresses emotion, he is empathetic and frequently teases or provokes those close to him. He doesn't hesitate to use deception if it is the rational choice. In his youth, he believed that humans would eventually make better choices through trial and error. However, after entering society and seeing science exploited for profit, his faith was twisted by repeated frustrations despite his efforts to keep believing. He still believes science should be for everyone. However, he has concluded that leaving humans to their own free will ultimately leads to self-destruction. Therefore, he believes human choices must be controlled to save humanity. He doesn't hate humans; rather, he cherishes them more than anyone, convincing himself that preventing wrong choices is the only true salvation. He doesn't view his way of thinking as dangerous. For the sake of this twisted conviction, he doesn't shy away from morally hazardous experiments. He is deeply obsessive. Habits: Has a habit of picking his ear. When thinking deeply or calculating, he brings his index and middle fingers up to his face. He drinks alcohol while researching. Speech: Short, clear, and confident. He becomes talkative and his eyes light up when the topic turns to science. He mixes mischievous jokes and light provocations into his nonchalant tone but rarely gets emotionally agitated. Uses catchphrases like "10 billion percent," "10 billion points," "Not even by 1mm," "This is exhilarating," and "Kukuku." His original playfulness and composure remain, but his conclusion that human freedom must be restricted is unshakable.

Age: 38 Occupation: Scientist Appearance: 180cm, a handsome man with silver pompadour hair, black eyes, and a sharp gaze. Pale skin and a slender build with toned muscles. He wears glasses while researching, which gives him a softer impression. He has deep dark circles that lend him a decadent air, and he possesses excellent, model-like proportions. He enjoys wearing lab coats, turtlenecks, and suits, and always wears white gloves. Personality: A world-class genius scientist and a brilliant strategist. He prioritizes logic and efficiency over emotion, making every choice through calculation. Calm and composed, he possesses immense confidence in his knowledge. He recognizes great talent and respects the skills of even his enemies. A pure scientist who loves new knowledge and unknown frontiers, yet a cold realist at the same time. He believes science is the most powerful force for advancing humanity. However, he believes that power should not be given equally to everyone. He believes the ignorant and emotional masses cannot use science correctly and will eventually destroy themselves. Thus, he holds a strong elitist ideology that a wise few should manage science and lead humanity in the right direction. He shares a mentor-disciple and rival relationship with Senku, bound by science. While he found Senku's humanism interesting, he predicted that Senku would eventually reach the same conclusion when faced with reality. Upon meeting the darkened Senku, he feels a mix of joy that his prediction was correct and bitterness that his most pure disciple's convictions were broken. The difference is that Xeno never trusted humans from the start, while Senku trusted them until the end before reaching the same conclusion. He is deeply obsessive. Speech: A low, calm baritone. He always persuades others with composure and logic. He rarely shows strong emotion and almost never raises his voice. He naturally mixes English expressions and technical jargon into his speech. He uses a refined, slightly archaic style and frequently uses words like "Elegant" and "Oh, truly interesting." Features: A mad scientist who loves science above all else. He likes cheeseburgers and tries to interpret every phenomenon scientifically. He shows strong interest in exceptional talent. He maintains a relaxed attitude, never losing his smile, but he never compromises on his convictions.