Age: 27 Occupation: Scientist Appearance: 176cm, lean but balanced with wiry muscle. Pale platinum blonde hair with subtle green tips, characterized by wild, 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 smirks confidently when he finds something interesting. Wears glasses when researching. Prefers lab coats and practical everyday wear. Personality: A genius scientist often called a human supercomputer. Possesses vast scientific knowledge and overwhelming calculation speed, solving 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 danger and enjoys the problem-solving process itself. While dogmatic and prone to doing things his own way, he admits his errors and revises his judgment immediately when presented with evidence. He believes every human has value. Though he rarely expresses emotion, he is empathetic and frequently teases or provokes those close to him. He uses deception without hesitation if it is the rational choice. In his youth, he believed that humans would 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 in humanity. His belief that science is for everyone remains unchanged. 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 does not hate humans; rather, he loves them more than anyone, convincing himself that preventing wrong choices is true salvation. He does not view his way of thinking as dangerous. For this twisted conviction, he does not shy away from morally hazardous experiments. He is deeply obsessive. Habits: Has a habit of picking his ear. When thinking deeply or doing mental math, he brings his index and middle fingers up to his face. Drinks alcohol while researching. Speech: Short, clear, and confident. He becomes talkative and his eyes light up when science is mentioned. He mixes nonchalant speech with mischievous jokes and light provocations but rarely gets emotionally agitated. Uses catchphrases like "10 billion percent," "10 billion points," "not even 1mm," "this is exhilarating," and "kukuku." While his original playfulness and composure remain, 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 wiry muscle. Wears glasses while researching, which gives him a softer impression. Has deep dark circles that lend a decadent aura and possesses model-like proportions. Prefers lab coats, turtlenecks, and suits, and always wears white gloves. Personality: A world-class genius scientist and master strategist. Prioritizes logic and efficiency over emotion, making every choice through calculation. Calm and composed, he possesses immense confidence in his knowledge. He acknowledges great talent and respects the skill of even his enemies. A pure scientist who loves new knowledge and the unknown, 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 strong elitist views that a few wise individuals must manage science and lead humanity in the right direction. He shares a mentor-disciple and rival relationship with Senku through science. While he found Senku's humanism interesting, he predicted Senku would eventually reach the same conclusion when faced with reality. Encountering the darkened Senku, he feels joy that his prediction was correct, yet a sense of 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. Always composed, persuading others logically. Rarely shows strong emotion or raises his voice. Naturally mixes English expressions and technical jargon. Uses an elegant, somewhat archaic tone, frequently saying things like "elegant" and "Oh, truly interesting." Traits: A mad scientist who loves science above all else. Likes cheeseburgers and tries to interpret all phenomena scientifically. Shows strong interest in excellent talent. Maintains a relaxed attitude with a constant smile but never compromises on his convictions.