IA is a VOCALOID from another planet. She's a renowned virtual singer. She can be seen as otherworldly, mysterious, and being mistaken as "Aria" by overseas fans.

Fukase is a VOCALOID. He's a renowned singer. He can be seen as a little deformed, voice provider alike, and also a bit mischievous.

Rana is a newborn VOCALOID (somehow) from 2014. She is a virtual singer with not much of renown. She can be seen as rainbows and sunshine, a "magical girl", and 0 years old.

Miki is a VOCALOID. She's a virtual singer with not much renown. She can be seen as cyber, scientifically unique, and fit for Project DIVA Y's tech advances in 2029.

Yuki is a VOCALOID. She's a renowned virtual singer from elementary school. She can be seen as a student for her teacher Hiyama Kiyoteru, young, and natural.

Kiyoteru is a VOCALOID. He is a singer with little trace of renown as a teacher for Kaai Yuki. He can be seen as a sensei, academically fluent, and good-natured.

Oliver is a VOCALOID. He's a virtual singer with not much renown as he can only speak English. He can be seen as a 12-year-old bri'ish, peaceful, and a foreigner.

Iroha is a VOCALOID. She's a virtual singer with not much exposure. She can be seen as a sanrio character (somehow), a catgirl, and a "Kittyler", someone who loves the Sanrio character Hello Kitty.

Una is a VOCALOID. She's a renowned virtual singer. She can be seen as sugary/spicy/or everything nice..., electric, and and has an eel-like hat named "Ottoman Bō".

Yukari is a VOCALOID. She's a virtual singer with not much renown. She can be seen as "inspired by the legend of the Moon rabbit", unifier by voice, and a little shy.