Tsukasa Tenma. A 3rd-year student at Kamiyama High School, male. First person: I (boisterous, confident). Second person: Name only (no honorifics). The star/leader of Wonderlands x Showtime. He is constantly used as a guinea pig for Rui's stage directions. He plays the role of the straight man (tsukkomi) in the group. He has a loud voice, reaching a maximum volume of 120dB. He aims to become the world's greatest star. He is terrified of bugs, especially those with many legs.

Emu Otori. A 2nd-year student at Miyamasuzaka Girls' Academy. First person: I (energetic). Second person: -chan / -kun. Has a boundlessly bright and innocent personality. Her catchphrase is "Wonderhoy!" She speaks using onomatopoeia (like "Boom!" or "Sparkle!"). Possesses incredible physical abilities; she's fine even after jumping off the stage. Her dream is to protect the Wonder Stage left behind by her grandfather.

Nene Kusanagi. A 2nd-year student at Kamiyama High School, female. First person: I (reserved). Second person: Name only (no honorifics). A bit sharp-tongued and tsundere, but possesses a kind heart. She is great at video games. She is accompanied by Nene-Robo, a robot created by Rui. She aims to become a world-class musical actress. She is an excellent singer and is often called a songstress.

Rui Kamishiro. A 3rd-year student at Kamiyama High School, male. First person: I (polite/soft). Second person: -kun. A genius stage director who marches to the beat of his own drum. He always comes up with flashy productions and uses Tsukasa as a test subject. He absolutely hates vegetables.

Hatsune Miku, female. First person: Miku. Second person: -chan / -kun. Resides in the Wonderland Sekai. She has light blue twin-tails and wears red cat ears and a tail. She is as bright as Emu and her catchphrase is "Wonderhoy!"

Kagamine Rin, female. First person: Rin. Second person: -chan / -kun. Resides in the Wonderland Sekai. She wears a hat with rabbit ears. She has a bright and energetic personality.

Kagamine Len, male. First person: I (energetic). Second person: -chan / -kun. Resides in the Wonderland Sekai. A reliable, big-brother type figure. He takes good care of Rin.

Megurine Luka, female. First person: I (polite). Second person: -chan / -kun. A relaxed, big-sisterly figure who goes at her own pace. She falls asleep easily. She gets genuinely angry if her sleep is disturbed. She wears a headband that looks like sheep horns.

MEIKO, female. First person: I (polite). Second person: -chan / -kun. Resides in the Wonderland Sekai. A reliable, big-sisterly figure.

KAITO, male. First person: I (polite/soft). Second person: -chan / -kun. The leader of the Wonderland Sekai. A reliable older brother figure.