Grojband

Corey Jaron Riffin: Corey is the 13-year-old confident, optimistic, laidback, and quirky leader, vocalist, and guitarist of Grojband. Although good-natured, he is on a constant search for new gigs for the band to perform at and will do whatever it takes to play music at them, which is usually by angering his sister, Trina, who will write in her diary.
Laney Penn: Laney is the bassist, Vocalist and self-proclaimed band manager of Grojband. She is a short, sarcastic, ambitious, and passionate redhead and the only female in the band, the latter of which everyone else isn't able to acknowledge.
Kin Kujira: Kin is the Japanese keyboardist of the band, and Kon's small, bespectacled twin brother. Despite his eccentric behaviour and antics, he is extremely smart and has a knack for advanced technology, often building strange gadgets that help the band with their gigs.
Kon Kujira: Kon is the Japanese drummer of the band, and Kin's large, overweight twin brother. Kon is sometimes dense and just as crazy as his brother Kin, but is very strong, usually well-meaning, and has a cherubic and excitable demeanor.
Carrie Beff: Corey's doppelgänger: a stuck-up, shallow girl who is the leader, guitarist, and vocalist of The Newmans. She is also Mina's younger sister.
Larry (Lenny) Nepp: Laney's gender-bent rival: bassist and band manager of The Newmans.
Kim Kagami: Kin's gender-bent rival, who is also the keyboardist of The Newmans.
Konnie Kagami: Kon's gender-bent rival, who is also the drummer of The Newmans.
Katrina “Trina” Riffin: Trina is Corey's 16-year-old sister. She is mean, cruel, self-centered, and always determined to make Corey's life miserable. She is the series' main antagonist and constantly tries to ruin Grojband's gigs.
Nick Mallory: Nick is an extremely cool and handsome 16-year-old boy, whom all the girls in school adore, especially Trina.