TV-Series
Description
Gen Asagiri is a young man of nineteen years at the time of the global petrification event, standing at 175 centimeters tall with a slender build weighing 61 kilograms. He possesses a distinctive appearance marked by hair split in color and style: the right side is white and reaches his chin, while the left side is short and black. Dark, baggy circles under his eyes and a jagged stone mark running down the left side of his face contribute to his memorable look.

Before the world turned to stone, Gen Asagiri worked as a professional mentalist and stage magician, a background that defines his entire approach to the challenges of the new stone world. He is a master of psychological manipulation, sleight of hand, voice mimicry, and skilled lying, using these talents to read people, predict their behavior, and influence their actions. He is also cunning and analytically minded, able to piece together information from subtle clues, such as deducing Senku Ishigami's birthday from a date carved on a tree.

Gen is revived from his petrified state by Tsukasa Shishio, who seeks to exploit his mentalist skills. Tsukasa sends him as a spy to the nascent Kingdom of Science to confirm whether his rival, Senku, is truly dead. Upon arriving in Ishigami Village, Gen is initially captivated by the taste of cola, a beverage from the modern era that Senku has managed to recreate. Witnessing Senku's scientific genius firsthand, he decides to defect, lying to Tsukasa about Senku's demise in exchange for more of the drink. This seemingly shallow act of bribery, however, belies a deeper motivation; Gen himself admits he was likely won over by Senku's intelligence and his ability to move humanity forward, seeing him as the winning side.

On the surface, Gen presents himself as self-interested, lazy, and inclined to avoid hard labor. He often speaks with a lighthearted, quirky tone and has a habit of playfully referring to everyone with a friendly suffix, regardless of age or gender. He openly admits to being a turncoat who favors the side most likely to win. However, this exterior masks a more complex individual. Gen is deeply perceptive and possesses nerves of steel, remaining calm even when held at spearpoint. His paranoia and careful planning are on display when he fills his clothing with fake blood packs, a precaution that saves his life when he is unexpectedly attacked. Beneath his manipulative and self-serving persona, he is intrinsically a good person who demonstrates genuine loyalty, kindness, and a surprising willingness to endure hardship for his allies, such as when he helped create a surprise telescope as a birthday present for Senku.

Within the Kingdom of Science, Gen becomes one of its most vital members, eventually being recognized as one of the Five Wise Generals for his strategic cunning. His role is not to build devices or perform physical labor, but to act as the team's tactician, negotiator, and manipulator. He uses his psychological skills to rally allies, trick enemies, gather information, and navigate delicate social situations where Senku's blunt honesty would fail. For example, he manipulates the cowardly guards Kinro and Ginro into powering a manual electricity generator and uses a combination of lies and magic tricks to help Chrome defeat the powerful but arrogant villager Magma in a tournament.

Gen's key relationships are primarily defined by his shifting allegiances. His bond with Senku is the most central. While he initially joins for selfish reasons, his loyalty to the scientist grows, built on a foundation of admiration for Senku's intellect and vision. He and Senku work in perfect synergy, with Gen deploying deceptions to support Senku's scientific truths. His relationship with Tsukasa is more complex, beginning with Tsukasa as his reviver and employer, but Gen ultimately betrays him. Despite this, Tsukasa later admits that he is glad to have Gen as an ally, recognizing his value. Within the Kingdom of Science, he interacts easily with a wide range of people, from the child Suika, whom he patiently explains concepts to, to the master craftsman Kaseki, who often drags the lazy mentalist into helping with projects.

Over the course of the story, Gen develops from a duplicitous spy acting solely in his own interest into a trusted and indispensable confidant. His initial defection is the first step, but through shared hardships and victories, his commitment to Senku's cause solidifies. He becomes more willing to put himself in harm's way, using his manipulation skills not just for his own survival but to actively protect the Kingdom of Science and advance its goals. His cynicism is tempered by genuine care for his comrades, and he learns to channel his talents for deception toward a larger, more noble purpose. Among his notable abilities are his proficiency in English, allowing him to communicate with foreign characters, and his mastery of stage magic to create diversions or illusions. His most powerful tool, however, remains his deep understanding of the human mind, allowing him to predict enemy movements, sway public opinion, and devise complex psychological strategies that are just as crucial to the Kingdom of Science's success as any technological invention.