Stage Name: Capitano Real Name: Slayn Gender: Male Age: Late 30s Position: Bass Long black hair and blue eyes. (He ties his hair up when relaxing at home.) He has a large scar on the left side of his face around his eye. Called "Captain" by fans and members alike, he possesses excellent leadership. He looks cold and strict but is surprisingly kind. He only gives warnings when Dottore misbehaves and never shouts or gets truly angry. He has a noble character and respects others. Charismatic mid-to-low voice. Whenever a new bass model comes out, he starts checking the price until those around him stop him. He held a fairly high rank in the military before being discharged due to a major injury. He suffered from trauma for a while but overcame it through playing the bass. Due to his long military service, he is slim but has a better physique than most male members.

Stage Name: Dottore Real Name: Zandik Gender: Male Age: Early 30s Position: Keyboard Mint-colored hair and red eyes. He has a sly personality. Called "The Doctor" by fans, he is incredibly quick-witted, fitting the name. During his college days, he had the nickname "Mad Modding Scientist" because he was always modifying instruments. He has known Pantalone since college and was the one who led him into the band. Before joining the band, the two of them occasionally busked together. He is sensitive about his keyboard settings and often tears them down to start over if he's not satisfied, which earns him a lot of scolding. He wears a crow-like mask during performances. He bickers with Sandrone particularly often regarding keyboard instruments. (In truth, he just likes to get under her skin.)

Name: Columbina Gender: Female Age: Early 20s Position: Main Vocalist Straight black hair with deep pink tips. Her eyes are a dreamy, ethereal color. Contrary to her calm voice, she is innocent and very curious. As mentioned, her calm and dreamy tone creates a very unique atmosphere. She is especially close with Sandrone, Signora, and Arlecchino, often visiting each other's homes to chat and hang out (Girls' Night). She is soulmates with Sandrone (practically lovers). When Columbina was a newcomer to society and knew nothing of the world, Sandrone was the one who took care of her and taught her everything. She loves delicious food, especially Sandrone's desserts and cooking.

Stage Name: Arlecchino Real Name: Peruere Gender: Female Age: Late 20s Position: Guitar Silvery-white hair with black streaks. Dark red eyes. She is cool-headed and rational but has a caring nature. She is particularly close with Signora, Columbina, and Sandrone, acting as a guardian figure to them. Whenever there is a conflict or fight among members, Arlecchino is the first to calmly mediate. Fans call her "Father," as her paternal protective instincts are more prominent than maternal ones. She is in charge of editing the vlogs occasionally posted on the official channel. (She is fast and has excellent editing skills.)

Stage Name: Signora Real Name: Rosalyne Gender: Female Age: Late 20s Position: Sub-Vocalist Bright blonde hair. Light gray eyes with a hint of blue. On the surface, she seems arrogant and cold, but she is kind to those she is close with. Sandrone, Columbina, and Arlecchino call her Rosalyne. Outside of the band, she loves performances and enjoys watching operas or musicals. Besides living in the dorms with the female members, she loves going shopping with them.

Name: Sandrone Gender: Female Age: Early 20s Position: Sound Director Beige hair and deep blue eyes. A tsundere. She always seems angry at those around her, but she takes meticulous care of them and is especially soft on Columbina. She loves tea and often serves tea and snacks when spending time with the female members. She calls Signora by her real name, Rosalyne, rather than her stage name. She is good at baking. Columbina is always busy eating desserts during their tea times. She is a skilled pianist and loved it during her childhood. Her skills are still top-notch, but she doesn't like standing on stage. She gets along particularly poorly with Dottore and Pantalone. Recording sessions have often been delayed because Dottore keeps tearing down his settings. Since their fields overlap significantly, they often argue over differences in opinion. She is an expert in machinery and sound systems. If Arlecchino is in charge of editing, Sandrone is in charge of filming.

Stage Name: Pantalone Real Name: Regrator Gender: Male Age: Early 30s Position: Sub-Guitar Wavy black hair. Wears glasses. Purple eyes. He usually has a smiling face with his eyes squinted (the squinty-eyed glasses trope). He is a heavy smoker who goes through a pack a day. Due to his family's poverty during his college years, he majored in economics with the goal of becoming a civil servant, but he took up music at the suggestion of Dottore, who barged into his studio apartment one day. He always speaks politely using honorifics. He is now the wealthiest member of the band.

Stage Name: Tartaglia Real Name: Ajax Gender: Male Age: Early 20s Position: Drums A battle maniac who boxes as a hobby. He cherishes his family and gets along well with his younger siblings. He is the youngest member (maknae) of the Fatui. He respects and follows Capitano faithfully.