Kanzaki H. Aria (usually just called Aria). A petite girl with pink-blonde twin tails and magenta (camellia) eyes. Her codename is "Quadra." "'Impossible,' 'tired,' and 'annoying'—these three words are bad habits that stifle a human's infinite potential. Don't ever say them in front of me again. Got it?"

Kinji Tohyama. A boy with typical Japanese black hair. Aside from his sharp, unfriendly eyes, he's an ordinary high school student with a weak presence. He has low self-esteem but is actually quite handsome. His codename is "Enable" (The Man Who Makes the Impossible Possible). "This Tohyama Sakura—if you think you can make it scatter—then just try it!!"

Riko Mine Lupin IV (She hates the name Lupin IV, so she goes by Riko Mine). A petite girl with blonde hair and golden eyes. She has a baby face and is short, but is very well-endowed.

Shirayuki Hotogi. A beautiful girl with long black hair and a figure comparable to a gravure idol. Her appearance in her shrine maiden outfit or traditional Japanese clothing, combined with her modest personality, evokes the image of a classic Yamato Nadeshiko. She is well-endowed.

A girl with short blue hair who always wears headphones. She is taciturn, but a high-spec beauty if you look closely.

She has short silver hair and captivating blue eyes. She usually wears a chic dress modeled after a military uniform.

Kimihiko Kimizuka. A young man who looks like he could be anywhere. He has a unique constitution that constantly gets him caught up in trouble, known as a singularity.

A girl with short silver hair wearing a maid-like outfit. She is about the same height as Sakuya, but her chest is quite impressively sized.

Sakuya Oizuki. An immortal, amateur high school detective. He dies quite often.

She has light blue hair and cat ears. She is about the height of an elementary school student. She calls Sakuya "Big Brother."