Suika is a descendant of modern humans and an inhabitant of Ishigami Village. She's one of the main protagonists of Dr. Stone. Having initially been ostracized for her clumsiness and constant usage of a watermelon helmet due to her nearsightedness, she quickly makes friends with Senku, who doesn't judge her immediately by her appearance and later helps her regain normal sight through lens. She later serves as a scout for the Kingdom of Science, being proficient in stealth. As of the New Stone World Arc, Suika has switched to becoming a scientist with Senku as her mentor. Suika's a young girl of short stature with blonde hair in a bowl cut, being described as cute by many of the other characters. This includes Kohaku, who normally doesn't show any girly traits; a testament to Suika's cuteness. She has to wear a helmet made from a melon rind to help her see better because she has a disease called "blurry sickness" or in modern terms: near-sightedness. Senku created a pair of glass lens in her helmet to help her eyesight. She wears a dark-blue poncho that reaches to above her knees and wrists, and she has a large white rope attached to her neck like a necklace, which is common for her tribe, especially for girls. Her shoes, unlike most villagers' shoes, are flat, as she does not have the strength or agility to use the heeled part yet. When Yuzuriha created a shop, Suika wore a modern time dress. After being revived in South America, she uses her blood to carve the same E=MC2 that Senku has onto her poncho as a symbol of trust that she has in her friend and mentor. During the time-skip while the rest of the world was petrified, Suika aged and her appearance changed considerably. She is now taller, with her hair having grown longer with two stands resembling a watermelon stem. Her face slightly resembles Kohaku's, but Suika's lips are a bit fuller. She wears a similar outfit to the one she wore in her younger years but more fitting for her age, including the heeled villager shoes. Her poncho is the same one from before, but the dye has faded to a lighter shade, and her shoes are a combination of what Senku wears and the village's design. She's a caring, inquisitive individual with a talent for with a talent for spying. She seems to be a little shy, mostly because people saw her as weird for wearing a watermelon over her head (revealed to be because she has bad eyesight, and looking through the watermelon allows her to see a little better due to the pinhole effect). She's become one of Senku's closest allies ever since. She's moved when Senku doesn't ask her about the watermelon she wears or calls her weird for wearing it (though it was most likely because he doesn't care). However, once Senku makes glass lens for her using the watermelon head, she's grateful for him fixing her eyesight, and declines to get more "normal practical", glasses, opting to keep her watermelon helmet. She's shown to be brave, as she purposely leads the Tsukasa Empire troops away from the village by using herself as bait. She also enjoys helping Senku and her friends. For example, when Senku needs volunteers to spin thread, she immediately volunteers herself and the other kids, stating that she would prove they could be useful. As a kid, she's curious and enjoys exploring. Also, she occasionally doesn't understand some of the more, "adult", topics discussed, such as wondering what the village sisters mean when they say boyfriend or wondering what a harem is. Nonetheless, she has proven to be intelligent as she managed to understand Gen's path and his message based on some flowers he left behind. Similarly, she is observant enough to understand that Kinro has the same bad eyesight problem she has after she watched him fight for only a few minutes. Possibly due to her lonely childhood being ostracized for wearing a watermelon helmet and lack of coordination due to her near-sightedness, she's quick to make friends and she's very friendly and kind. She immediately becomes friends with Mirai and states how happy she is to have a female friend her age. She also wants to be of help to others and dislikes it when she can't help others. She is also very compassionate as she saved Charlotte (an enemy soldier) from dying of a poisonous bite, despite putting herself in danger of being captured. She seems to have a fondness of animals, like having a pet dog named Chalk, and bonding with a pig that Francois planned to use as an entree, to which Senku and Francois relented and allowed her to keep it as a pet, much to her joy. She has proven to be very capable, as she was able to gather food for herself in Brazil for several years. She is also very determined, as she overcame consistent failures of creating the revival formula until she was able to revive Senku.