Chiyo Yumehara attends PK Academy, sporting short orange-brown hair usually secured by a pink hairband and honey-colored eyes. Standing 158 cm tall, this petite Gemini, born June 11 with blood type B, possesses a romantic nature marked by unstable relationships. Her affections shifted frequently, first targeting Saiki Kusuo before moving to Takeru Shinoda. That relationship dissolved due to Takeru's unpleasant habits and attitude, prompting her attention to return to Saiki. Later, on an Okinawa trip, Kaidou Shun defended her from beach harassment, sparking new feelings; however, this infatuation was subsequently reversed by external interference. Aiura Mikoto, observing Chiyo's romantic patterns, predicts a future of four divorces, citing fluctuating emotions and poor partner judgment. Her history includes dating Akanishi Shinichi, who exploited her financially, and Takeru. Chiyo experiences significant vacation weight fluctuations, often becoming "morbidly obese," but rapidly sheds the pounds due to embarrassment or renewed romantic motivation. During her third year of junior high, Chiyo maintained a now-inactive website where she posted a self-insert novel. Academically, she ranks 139th out of 181 students. After developing feelings for Kaidou, she exhibited slight chuunibyou tendencies, claiming her hairband acted as a "seal" when alone. Her aura manifests as tiny hearts, and her guardian spirit is identified as a politician. She appears in all "The Disastrous Life of Saiki K." anime adaptations, including "Reawakened," and features in the manga and video games like "The Disastrous Life of Saiki K.: Delusion Runaway! Psychic Battle." Official "Reawakened" promotional artwork depicts her with rat ears in a New Year’s celebration image alongside other characters.