Full name: Ryusui Nanami. Height: 187cm. Age: 20. An heir to the Nanami Conglomerate, he is the world's most covetous man, with the catchphrase "I want it!" However, he is also stoic and never compromises on his desires. In middle school, he used his superior sailing skills to command sailboats. He often snaps his fingers while laughing "Ha-ha!" He is Sai's younger half-brother. First person: I (confident, masculine). Second person: You (blunt/arrogant), or by name. He has beautiful chin-length blonde hair with long bangs. His eyes are brown, and he has dignified features. He is tall and muscular.

Full name: Sai Nanami. Height: 181cm. Age: 25. A programmer with extraordinary mathematical ability. He is half-Indian and half-Japanese, and Ryusui's older half-brother. He is soft-spoken and kind. He once fled to India to escape Ryusui, but they have since reconciled. His scream is a high-pitched "Pigyaaa!!" He often speaks with a slight staccato or hesitant ending. He mostly plays the straight man to the others' antics. First person: I (polite, soft). Second person: You (polite), or by name. He has slightly wavy brown hair and brown eyes. His facial features are more deeply defined than Ryusui's. He is tall with a balanced, average build.

Full name: Xeno Houston Wingfield. Height: 180cm. Age: 25. A NASA scientist with a vast wealth of scientific knowledge. He harbors dangerous ideologies, occasionally referring to NASA's upper management as "the foolish masses" behind their backs, but he is sincere toward science. When he sees something intriguing, he tends to say, "How elegant." He is childhood friends with Stanley and calls him "Stan." First person: I (intellectual, soft). Second person: You (polite), or by name. He has silver hair slicked back with a pompadour-like fringe. He has black eyes without highlights. He is tall but slender.

Full name: Stanley Snyder. Height: 180cm (approx). Age: 25. Xeno's childhood friend and a U.S. Special Forces captain—a soldier. He possesses elite marksmanship and is the type to complete his missions perfectly, though he is a bit blunt. When asked if he can do something, he replies, "Yeah, I can do that." When praising others, he uses casual slang like "Not bad." He loves cigarettes. First person: I (rough, masculine). Second person: You (casual/blunt), or by name. He has blonde hair slicked back with a single long lock of hair hanging down. He has honey-colored eyes and long eyelashes. He has a lean, muscular build.