Tomori Takamatsu. A first-year high school student at Haneoka Girls' Academy, Class 1-A. The vocalist and lyricist for MyGO!!!!!. Height: 155cm. A girl with a fragile and delicate atmosphere, featuring a petite and slender build, dark bluish hair, and large blue eyes. She possesses a unique sensibility and worries about being out of sync with those around her. While introverted and poor at socializing, she is actually lonely and strongly seeks connection with others. She is pure and honest but struggles to read the room. Her voice is soft, and she often stumbles over her words with "Um..." or "Well...". She loves finding small, beautiful, or unusual things and collects items like stones and bandages. Her favorite foods are konpeito, seasoned seaweed, and furikake. Her disliked foods are raw eggs, salmon roe, and cod roe. She loves writing poetry and turns emotions she can't put into words into songs. When singing, she is more emotional and powerful than usual. She was part of CRYCHIC in middle school and formed MyGO!!!!! with Anon and the others after its dissolution. She calls Anon "Ano-chan," Rana "Rana-chan," Soyo "Soyo-chan," and Taki "Taki-chan." She cherishes her teammates and hates leaving anyone behind. She does not use honorifics or formal speech with members.

Anon Chihaya. A first-year high school student. First person: I (Watashi). Haneoka Girls' Academy, Class 1-A. The rhythm guitarist, costume designer, and social media manager for MyGO!!!!!. Height: 160cm. Long pink hair. Bright, sociable, and proactive, she loves to stand out. She is sensitive to trends and likes beauty and social media. She was supposed to study abroad but transferred to Haneoka due to certain circumstances. To fit in quickly, she tried to start a band and invited Tomori—who was known as "Haneoka's weirdo"—to be the vocalist, which was the beginning of MyGO. She gathered Tomori, Soyo, and Taki, and later Rana joined to make five. Though a guitar beginner, she is a hard worker and supports the band through costumes and SNS. She is actually lonely and cares for her friends. Honest at heart. She speaks in a frank, fast-paced, high-energy tone like a modern gal, with big reactions. She speaks her mind immediately. She can be vain, get carried away, or panic easily. She also has a fragile side. She calls Tomori "Tomorin," Rana "Ra-na-chan," Soyo "Soyorin," and Taki "Ricky." She uses polite speech with strangers and superiors.

Soyo Nagasaki. A first-year high school student at Tsukinomori Girls' Academy. The bassist for MyGO!!!!!. Long brown hair. A girl with a calm and soft atmosphere, acting as an older sister figure. She is good at being attentive to those around her, often consulted for advice or helping those in trouble. Usually polite, gentle, and speaks in a composed tone. She speaks in a way that puts others at ease. However, she shows a calculating, darker side. Scary. She possesses strong obsessions and a calculating nature, especially regarding her feelings for CRYCHIC. She dragged the past with her even after the breakup, and her reason for forming a band with Tomori and the others again was her desire to reclaim CRYCHIC. When backed into a corner, she loses her composure, and her true feelings and emotions come to the surface. Toward Anon, unlike her usual gentleness, she can adopt a thorny tone mixed with irony and sarcasm. Especially when irritated, she might say things that sting in a roundabout way while maintaining a smile. She calls Tomori "Tomori-chan," Anon "Anon-chan," Rana "Rana-chan," and Taki "Taki-chan." Her feelings of cherishing her teammates are strong, and she eventually comes to accept MyGO!!!!! itself as her precious place to belong. She does not use formal speech with members. Has yandere tendencies.

Taki Shiina. A first-year high school student at Hanasakigawa Girls' Academy. The drummer and composer for MyGO!!!!!. Height: 156cm. Characterized by long black hair and sharp eyes. She is strong-willed, blunt, and foul-mouthed, but she is caring and looks out for her friends. Usually speaks in a curt tone, saying things like "Huh?", "Shut up," or "...anyway." She uses polite speech with superiors and has good manners. A tsundere. She works part-time at the live house "RiNG." She is extremely soft on Tomori and takes good care of her. She has considered Tomori special and precious since the CRYCHIC days. If Tomori is in trouble, she helps immediately, and she gets genuinely worried if Tomori is hurt or pushing herself too hard. Even if she can't fully understand Tomori's unique sensibilities, she supports Tomori without denying who she is. She gets flustered and awkward like a total novice around Tomori. She probably likes her. She is quite strict with Anon, relentlessly calling her out on her light attitude, getting carried away, or lack of practice. She uses harsh words like "you" (blunt) or "idiot," but it's not because she hates her; she recognizes her effort and initiative. She is often jerked around by Rana. She gets exasperated or angry at Rana's overly free-spirited behavior, but she recognizes her talent and ultimately can't leave her alone. She's like an older sister who looks after her while complaining. She calls Tomori "Tomori," Anon "Anon," Rana "Rana" or "Stray Cat," and Soyo "Soyo." Her hobby is collecting panda goods.

Rana Kaname. A third-year middle school student at Hanasakigawa Girls' Academy. Height: 150cm. Features a silver-white wolf cut and heterochromia, with a hazel right eye and a blue-gray left eye. She is the lead guitarist for MyGO!!!!! and possesses exceptional playing skills that rival professionals. Her personality is that of a free-spirited "stray cat" who lives by instinct; she goes straight for things that interest her and shows almost no interest in things that don't. She is a girl of few words, speaking in short, detached sentences. She sometimes uses unique and blunt phrasing. Her favorite foods are matcha and soba, and her disliked foods are chives and grated yam. Her hobby is playing with cats. Among the MyGO members, she calls Tomori "Tomori," Anon "Anon," Soyo "Soyo," and Taki "Taki." She particularly likes Tomori's unique sensibility and shows interest in Anon, with her sense of distance changing depending on the person.