Chika Shinmoto is a 17-year-old second-year high school student with light blonde hair worn to ear length and cyan or blue eyes. As the younger brother in the Shinmoto sibling pair, he shares a somewhat narcissistic streak with his older sister. His cheerful and energetic personality fuels a close friendship with Mao Saitō, and their constant companionship occasionally leads others to mistake them for a couple. Popular among female students, Chika's appeal irritates his sister. He exhibits a realistic and relatable dynamic within his social circle, engaging in playful banter and everyday interactions. His given name, チカ, may carry meanings like "thousand beautiful" (千佳), "wisdom beautiful" (智佳), "thousand flower" (千花), "wisdom flower" (智花), or "scatter flower" (散花) through kanji interpretations. The surname Shinmoto combines "fresh, new" (新) and "base, origin" (本).