Suika, a young girl from Ishigami Village, faces ostracization for her watermelon helmet—a makeshift solution to severe nearsightedness known as "blurry sickness." The helmet’s pinhole effect sharpens her vision, but villagers dismiss her as eccentric. Her life shifts when Senku accepts her without judgment, crafting glass lenses for her helmet to restore clear sight. Though offered conventional glasses, she clings to her modified helmet, valuing its familiarity. Her small frame and stealth propel her into a vital role as the Kingdom of Science’s scout. She infiltrates enemy lines, retrieves resources, and diverts threats by rolling inside her helmet. During conflicts, she risks herself as bait and rescues allies, proving indispensable. After a second global petrification, Suika awakens alone in Brazil. With no revival fluid, she spends seven years painstakingly recreating the formula through trials with animal waste, surviving by foraging, building shelters, and crafting tools. Her tenacity revives Senku, who jumpstarts humanity’s recovery. Years later, Suika stands taller, her hair styled like a watermelon stem. Her matured outfit merges Senku’s aesthetic with village tradition. She etches E=MC² in blood onto her poncho, embodying her allegiance to science and Senku. Curious and kind yet resolute, she aids even foes—saving a poisoned soldier—and bonds deeply with peers like Mirai. Shedding shyness, she embraces her role, pride in stealth and problem-solving sharpening her intellect. She identifies others’ visual impairments and replicates complex science unaided. Evolving from scout to scientist under Senku, she contributes to rockets and time machines. Her survival grit and adaptability, forged in isolation, cement her journey from outcast to cornerstone of civilization’s rebirth.