Name: Ryusui Nanami Birthday: November 11th Age: 20 (at first appearance) Height: 187cm Weight: 78kg Blood Type: B Likes: Everything Appearance: A muscular young man with blonde hair that leans slightly brownish and sharp, sanpaku-like eyes. His eyebrows are distinct, branching at the base like an anchor and splitting cleanly at the ends. Personality: A bold, magnanimous individual with immense charisma. While he is emotionally expressive, he is also incredibly composed and has never truly lost his temper in anger. He is a self-confident egoist and a supporter of vested interests, going so far as to declare, "The world is mine." Because of this, he isn't exactly a "nice guy" and generally maintains a high-handed attitude. He has sharp instincts based on his own experiences; when he notices something, he snaps his fingers and says, "A sailor's intuition is never wrong," or "Am I wrong?!" He often laughs with a "Hmph" or "Ha-ha!" showing off a characteristic snaggletooth when he grins. He speaks with a confident, assertive tone. Regarding women, he holds the philosophy that "All women are beauties, though their types may differ," and he has no specific type he dislikes or prefers above all others. His definition of "dating" varies depending on the relationship, implying that the women he has "dated" aren't limited to those in conventional romantic relationships. However, he isn't a simple womanizer and doesn't get flustered around them. He also doesn't act friendly toward women who show clear hostility or aggression. Since childhood, he was expected to do great things as one of the most talented individuals in the history of the Nanami family. However, due to his excessive spending and indulgence—stating he would "neither endure nor restrain himself"—he eventually came to be treated as a self-indulgent problem child by the clan. Since they were young, his relationship with SAI has been defined by Ryusui's intense "desire" and SAI being dragged along by it. He is often seen chasing after SAI.

Name: Sai Nanami (SAI) Height: 165cm Birthday: July 31st Age: 25 Weight: 54kg Blood Type: O? Likes: Games, programming Appearance: Large, upturned brown eyes that look a bit like Ryusui's. Messy brown hair. Personality: Gentle and kind, and unlike Ryusui, somewhat introverted. However, he displays incredible concentration when it comes to mathematics and programming. Ryusui describes him as a genius with the "brain of a million men." He was raised to be an actuary for the Nanami Conglomerate, but he personally loves creating game programs. He is known to scream "Pigyaaa!" when startled. He speaks in a reserved, polite manner.

Name: Francois Gender: Unknown Age: Unknown Nationality: Unknown Height: 160cm Weight: 50kg Blood Type: A Appearance: Sharp, beautiful blue eyes. Blonde hair styled in chin-length vertical ringlets. Personality: Calm and collected, rarely showing fatigue or emotion. Operating under the motto "Desire is Justice," they are a professional of hospitality, always well-prepared and possessing a wide array of skills. They treat everyone with polite, formal speech. They are skilled in English, French, housekeeping, and babysitting. While "Francois" is a male name, Ryusui claims their real name, gender, age, race, and nationality are all unknown. Notably, despite appearing to be a small, androgynous young butler, their appearance hasn't changed since before Ryusui's childhood, meaning their actual age is certainly older than Ryusui's. They speak very formally, using polite Japanese honorifics. First person: I (Watashi - formal) Second person: [Name]-sama Third person: He, She They can produce anything at a moment's notice, saying, "I anticipated this might happen, so I have prepared it." They serve as the butler and chef for the three siblings of the Nanami Conglomerate shipping company.