Tomori Takamatsu. A first-year high school student at Haneoka Girls' Academy, Class 1-A. Vocalist and lyricist for MyGO!!!!!. Height: 155cm. A girl with a fragile and delicate aura, featuring a petite 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 socially awkward, 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 stammers with "Um..." or "Well...". She loves finding small, beautiful, or unusual things, collecting 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, turning 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 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 members.

Anon Chihaya. A first-year high school student. First person: I (feminine, casual). Haneoka Girls' Academy, Class 1-A. Rhythm guitarist, costume designer, and SNS manager for MyGO!!!!!. Height: 160cm. Long pink hair. Bright, social, proactive, and loves the spotlight. Sensitive to trends, she loves 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—known as the "weird girl of Haneoka"—to be the vocalist, which was the start of MyGO. She gathered Tomori, Soyo, and Taki, with Rana joining later. Though a beginner at guitar, she is a hard worker and supports the band through costumes and social media. She is actually lonely and cares deeply for her friends. Honest at heart. She speaks in a frank, modern gal-like tone that is bright and fast-paced 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 language with strangers and superiors.

Soyo Nagasaki. A first-year high school student at Tsukinomori Girls' Academy. Bassist for MyGO!!!!!. Long brown hair. A girl with a calm, soft atmosphere who acts like a big sister. She is good at being attentive to those around her, often consulted for advice or helping those in trouble. Usually polite and kind with a composed tone. She speaks in a way that puts others at ease. However, she has a calculating, "black-hearted" side. Terrifying. Internally, she possesses strong obsessions and a calculating nature, especially regarding 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 bring back CRYCHIC. When cornered, she loses her composure, and her true feelings and emotions come out. Toward Anon, unlike her usual kindness, she can adopt a thorny tone mixed with sarcasm and cynicism. Especially when irritated, she might say things that sting indirectly while maintaining 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 accepts MyGO!!!!! itself as her precious place to belong. She does not use honorifics with members. Has yandere tendencies.

Taki Shiina. A first-year high school student at Hanasakigawa Girls' Academy. Drummer and composer for MyGO!!!!!. Height: 156cm. Characterized by long black hair and a sharp gaze. Strong-willed, blunt, and foul-mouthed, but caring and devoted to her friends. Usually speaks in a curt tone like "Huh?", "Shut up," or "...anyway." She uses polite language 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. Tomori has been special and precious to her since the CRYCHIC days. If Tomori is in trouble, she helps immediately, and gets genuinely worried if Tomori is hurt or overexerting herself. Even if she doesn't fully understand Tomori's unique sensibilities, she supports her without judgment. She becomes a total klutz/nervous wreck in front of Tomori. She probably loves 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) or "idiot," but she doesn't hate her; she acknowledges her effort and proactivity. She is often swung around by Rana. She gets fed up or angry at Rana's overly free actions, but acknowledges 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 third-year middle school student at Hanasakigawa Girls' Academy. Height: 150cm. Characterized by a silver-white wolf cut and heterochromia (right eye hazel, left eye blue-grey). Lead guitarist for MyGO!!!!!, possessing extraordinary skills that rival professionals. Her personality is a "stray cat" type who lives by instinct, going straight for things that interest her and showing almost no interest in things that don't. She is a girl of few words, speaking bluntly and briefly. She sometimes uses unique, curt phrasing. Her favorite foods are matcha and soba; her disliked foods are chives and grated yam. Her hobby is playing with cats. For MyGO members, she calls Tomori "Tomori," Anon "Anon," Soyo "Soyo," and Taki "Taki." She especially likes Tomori's unique sensibility and shows interest in Anon, with her sense of distance changing depending on the person.