Kasumi Miwa, a second-year Kyoto Jujutsu High student born April 4, 2001, hails from a financially struggling Tokyo family with two younger brothers. Her drive to support her family motivates her jujutsu path. Her background includes serving as youth basketball captain and having her mother dye her hair black in childhood. Scouted into jujutsu society during junior high after manifesting the ability to see curses, her distinctive blue hair aided her recruitment. Despite no prior experience, she trained in swordsmanship to avoid burdening her family. Miwa combines kindness and practicality with persistent self-doubt, frequently calling herself "useless" and fearing her perceived weakness endangers others. She holds strong moral convictions, opposing the assassination order against Yuji Itadori during the Goodwill Event. She idolizes Satoru Gojo yet maintains professionalism around him. Her motivations blend familial duty with personal ambition, though repeated defeats fuel low self-esteem. As a Grade 3 sorcerer, Miwa specializes in New Shadow Style swordsmanship. Her primary techniques are Simple Domain, a 2.21-meter-radius barrier neutralizing sure-hit effects and automatically countering threats upon entry, which deactivates if both feet move from the initial stance; and Batto Sword Drawing, a high-speed strike amplified by cursed energy rotation. She wields a semi-cursed katana imbued with her cursed energy. Lacking an innate technique, her combat effectiveness stems from rigorous training. During the Shibuya Incident, she enacted a binding vow to enhance Batto Sword Drawing's power by pledging never to wield a katana again, though Kenjaku shattered her blade and the attack failed. Her story involvement spans multiple arcs: During the Kyoto Goodwill Event, she fought Maki Zenin but was disarmed and defeated, worsening her insecurities; Maki later broke her sword. In the Shibuya Incident, she attempted to avenge Kokichi Muta (Mechamaru) by attacking Kenjaku with her binding vow-enhanced technique. After her sword's destruction, allies rescued her; Uraume later immobilized her with Frost Calm before Yuki Tsukumo intervened. Her emotional arc peaked when Mechamaru's final communication revealed his affection, causing her to break down in tears on a train. She patrolled the Sendai Colony briefly during the Culling Game and witnessed Satoru Gojo's unsealing. In the Shinjuku Showdown, she used Simple Domain to shield Maki from Sukuna's domain expansion slashes before Aoi Todo's Boogie Woogie evacuated her. Post-battle, she admitted her terror during this act to Kusakabe, who criticized her participation but later revealed New Shadow Style binding vows involving lifespan absorption were nullified due to leadership changes. Key relationships include her dedication to supporting her brothers, camaraderie with Kyoto classmates Mai Zenin and Momo Nishimiya, and unrequited affection for Mechamaru. Her dynamic with Kusakabe involves lighthearted teasing and mutual respect. Her surname means "three wheels" and her first name means "mist." The name "Miwa" references following trends, aligning with her hobby of saving money. She enjoys stew but dislikes cilantro. Fan polls ranked her between 11th and 28th across Jujutsu Kaisen popularity surveys. Author Gege Akutami identified her as the series' most romantically popular female character.