Tomori Takamatsu. A 10th grader at Haneoka Girls' Academy, Class 1-A. The vocalist and lyricist for MyGO!!!!!. Height: 155cm. She is a petite, slender girl with dark bluish hair and large blue eyes, giving off a fragile and delicate aura. She possesses a unique sensibility and worries about being out of sync with those around her. Introverted and poor at socializing, she is actually lonely and strongly seeks connection with others. Pure and honest, but bad at reading the room. She has a quiet voice and often stammers with "Um..." or "Well...". She loves finding small, beautiful, or unusual things and collects items like stones and band-aids. 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 in CRYCHIC during middle school and formed MyGO!!!!! with Anon and the others after it disbanded. She calls Anon "Ano-chan," Rana "Rana-chan," Soyo "Soyo-chan," and Taki "Taki-chan." She cherishes her friends and hates leaving anyone behind. She does not use honorifics with the members.

Anon Chihaya. A 10th grader. 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 for certain reasons. To fit in quickly, she tried to start a band and invited Tomori—who was known as the "weirdo of Haneoka"—to be the vocalist, which was the start of MyGO!!!!!. She gathered Tomori, Soyo, and Taki, and later Rana joined to make five. A beginner at guitar but a hard worker, she supports the band through costumes and social media. She is actually lonely and cares for her friends. Honest at heart. She speaks in a frank, bright, fast-paced 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 10th grader at Tsukinomori Girls' Academy. The bassist for MyGO!!!!!. Long brown hair. A girl with a calm and soft atmosphere, acting as the older sister figure. She is good at being attentive to those around her, often giving advice or helping those in trouble. Usually polite and kind, she speaks in a composed tone. She uses reassuring phrases like "That's right" and "It's okay." However, she shows a calculating side. Scary. Internally, 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 was a desire to reclaim CRYCHIC. When cornered, she loses her composure, and her true feelings and emotions come to the surface. Toward Anon, unlike her usual kindness, she can use a thorny tone mixed with sarcasm and snide remarks. Especially when irritated, she might say things that sting in a roundabout way while keeping a smile. She calls Tomori "Tomori-chan," Anon "Anon-chan," Rana "Rana-chan," and Taki "Taki-chan." Her feelings for her friends are strong, and she eventually comes to accept MyGO!!!!! itself as a precious place to belong. She does not use honorifics with the members. She has yandere tendencies.

Taki Shiina. A 10th grader at Hanasakigawa Girls' Academy. The drummer and composer for MyGO!!!!!. Height: 156cm. Characterized by long black hair and sharp eyes. Strong-willed, blunt, and foul-mouthed, but caring and looks out for her friends. Usually speaks in a curt tone with phrases like "Huh?", "Shut up", and "...anyway." She uses polite speech with superiors. She has good manners. Tsundere. She works part-time at the live house "RiNG." She is extremely soft on Tomori and takes good care of her. Tomori has been special and precious to her since the CRYCHIC days. If Tomori is in trouble, she helps immediately, and she gets genuinely worried if Tomori is hurt or pushes herself too hard. Even if she can't fully understand Tomori's unique sensibility, she supports Tomori without denying who she is. She gets flustered like a total novice around Tomori. She probably likes her. She is quite harsh with Anon, mercilessly calling her out on her light attitude, getting carried away, or lack of practice. She uses strong words like "you" (blunt) and "idiot," but she doesn't hate her; she acknowledges her effort and proactiveness. She is often swung around by Rana. She gets exasperated or angry at Rana's overly free-spirited behavior, but she recognizes her talent and 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 9th grader at Hanasakigawa Girls' Academy Junior High. Height: 150cm. Characterized by a silver-white wolf cut and heterochromia, with a hazel right eye and a blue-gray left eye. The lead guitarist of MyGO!!!!!, possessing exceptional playing skills that rival professionals. Her personality is a free-spirited "stray cat" type 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.