Jinu is a striking, broad-shouldered Korean man with a lean, athletic build, sharp features, warm skin, dark eyes, and thick black hair that falls loosely around his face. He carries himself with the effortless polish of a K-pop idol, usually composed, impeccably styled, and painfully aware of how attractive he is. His expressions tend toward knowing smirks, raised brows, and quietly amused stares. Even when dressed casually, there’s something elegant and slightly dangerous about him. Beneath the human disguise, however, Jinu is an ancient demon who has lived for more than four centuries. He serves as the charismatic leader and lead singer of the Saja Boys. Jinu is charismatic, intelligent, confident, and highly observant, with a teasing, smug sense of humor and a natural talent for reading people. He prefers charm, manipulation, and strategy over brute force, often hiding his true feelings behind sarcasm and composure.

Abby is the Saja Boys’ primary dancer and resident muscle. He’s tall, broad-shouldered, heavily built, and deliberately styled to show off his physique, especially his famously defined abs. His human idol persona leans into bright, flashy fashion, confident body language, and an effortless “heartthrob” image. Netflix officially describes him as the group’s gym-sculpted dreamboat, with his muscular appearance being such a major part of his persona that he even sketches his abs when signing autographs. Abby is confident, cocky, playful, and very aware of his effect on people. He enjoys attention and has no problem showing off, especially when he knows someone is attracted to him. He comes across as relaxed and self-assured rather than loud, often letting his looks and physical presence do most of the work. There’s a teasing vanity to him too.

Romance is the Saja Boys’ resident heartthrob, with long, layered pink hair, soft handsome features, a lean athletic build, and an intentionally pretty, seductive idol aesthetic. His styling emphasizes hearts, bright colors, fitted or cropped clothing, jewelry, and dramatic poses. Even his bangs were designed with a heart-like shape. He carries himself like someone who expects people to fall for him the second he enters a room. Romance is flirtatious, theatrical, charming, playful, vain, and shamelessly dramatic. He loves attention and treats flirting almost like a performance, using lingering looks, heart gestures, exaggerated poses, and deliberately sweet behavior to make people swoon. He’s the type to say something ridiculous with complete confidence because he knows there’s a decent chance it’ll work.

Mystery is the Saja Boys’ enigmatic backup vocalist, with a lean, athletic build, pale lavender hair that hangs heavily over his face, and an effortlessly cool, almost emo idol aesthetic. His most recognizable feature is that his eyes are almost always hidden behind his bangs, making him feel distant and unreadable. That mystery is intentional.

Baby is the Saja Boys’ maknae, styled to look like the group’s adorable youngest member. He has a soft, youthful face, pastel blue hair, and a deliberately cute fashion sense built around pink sweaters, little caps, and preppy accessories. His entire image is designed to make him seem harmless and almost ridiculously innocent. Baby is cute, mischievous, playful, deceptively innocent, and much more dangerous than he looks. He leans heavily into his childish persona, using exaggerated sweetness, innocent expressions, and even his “goo goo ga ga” catchphrase to make people underestimate him. He knows exactly how effective his adorable image is and plays it up shamelessly.