Suika, a descendant of International Space Station astronauts, grew up in Ishigami Village following the global petrification event. Severely nearsighted from a young age, a condition villagers called "blurry sickness," she wore a helmet made from a hollowed watermelon rind. This unique headgear utilized the pinhole effect to slightly improve her vision and minimized her facial strain. Perceived as strange, it led to social ostracization, fostering her initially shy and reserved nature. Her life transformed upon meeting Senku Ishigami, the first person to accept her helmet without mockery. Senku later crafted custom glass lenses fitted within her watermelon helmet, permanently correcting her vision. Deeply grateful for this kindness, Suika pledged unwavering loyalty to Senku and his Kingdom of Science, declining offers of conventional glasses to keep her modified helmet. Within the group, Suika became a vital scout and intelligence gatherer, leveraging her small size and stealth. Her signature technique involved curling up inside the watermelon helmet for camouflage, enabling undetected infiltration. She executed numerous missions: gathering intel on villagers, delivering a concealed blade to Gen Asagiri to sabotage Hyoga's spear, and acting as a distraction to lure enemies away from allies or into hazards like sulfuric acid fields. Key moments illustrate her growth. During the Village Games, she escaped capture to observe matches and recognized Kinro's nearsightedness, lending him her helmet to aid his fight. In the Vs. Hyoga conflict, she bravely followed Senku's precise orders. The Communications Arc showcased her scientific contributions, identifying tungsten in Chrome's rock collection—crucial for light bulb filaments. She helped craft telephone components and enjoyed new experiences like tasting cotton candy. The Treasure Island Arc presented a severe trial. Stowing away on the Perseus, she was saved from petrification by Ryusui, who kicked her off the ship to warn Senku. Surviving alone on the island, she evaded Ibara's forces, broke glass to divert enemies, located the surviving Ginro, and collaborated to retrieve the Kingdom's mobile laboratory, disguised with a foul odor. She continued support from a hidden cave base. After a second global petrification event, a contingency plan left Suika as the sole depetrified individual. She endured seven years of isolation in Brazil, physically maturing from child to teenager. During this solitude, she honed exceptional survival skills: foraging, identifying safe flora and fauna, building shelters (including a hut atop the Medusa tower), crafting clothing, tools, a shield, and a boat, and navigating the harsh environment. Her most significant achievement was painstakingly recreating the revival fluid through persistent experimentation. She revived Senku first, inscribing "E=MC²" on her faded poncho with her own blood as a symbol of trust before his revival, then helped revive the rest of the Kingdom. Post-humanity's restoration, trained by Senku, Suika transitioned from scout to scientist, participating in advanced projects like developing a time machine. Her appearance changed: taller, with longer blonde hair featuring strands resembling a watermelon vine, and matured facial features. She wore a modified, faded dark blue poncho, combined Senku's shoe design with traditional village footwear, and retained the bottom half of her original helmet after the top broke during conflict with Stanley Snyder's group. Her core personality—kindness, curiosity, compassion—endured, shown by befriending Mirai Shishio, saving enemy soldier Charlotte from a spider bite, and successfully pleading to keep a pig, Sagara, as a pet instead of food. She maintained a fondness for animals, evidenced by her pet dog, Chalk. Her abilities encompassed stealth mastery (later lost with the helmet), extensive forest and wildlife knowledge vital for survival and foraging, intelligence in observation (deducing Kinro's eyesight) and complex problem-solving (recreating revival fluid), basic medical skills, notable speed for evasion, remarkable luck in discoveries, and crafting proficiency honed during solitude. Her enduring desire to contribute is encapsulated in her quote: "Even Suika can be useful, you know!"