Rumi Kang is the main protagonist of the 2025 animated film KPop Demon Hunters, serving as the charismatic leader and main vocalist of the K-pop group HUNTR/X, which also operates as a secret trio of demon hunters. As a half-demon human, she hides her identity and glowing skin markings while striving to create the Golden Honmoon, a mystical barrier intended to banish demons and erase her heritage, though her journey ultimately centers on self-acceptance and embracing her dual nature.

Romance Saja is a minor antagonist in the 2025 animated film KPop Demon Hunters, serving as the romantic archetype and a member of the demonic boy band Saja Boys, whose mission is to drain fans' souls to weaken the protective Honmoon barrier. Voiced by Joel Kim Booster with singing by samUIL Lee, he is characterized by his pink heart-shaped hair, seductive charm, and ability to manifest hearts, all of which he uses to lure fans away from the hero group HUNTR/X.

Baby Saja is the maknae (youngest member) and main rapper of the demonic K-pop group Saja Boys in the 2025 animated film KPop Demon Hunters, serving as a minor antagonist who disguises himself as an innocent idol to steal souls for the demon king Gwi-Ma. Despite his childlike appearance, featuring a turquoise "mushroom" haircut, oversized sweaters, and a toddler-like persona, Baby is actually centuries old and possesses a sly, ruthless, and emotionally distant nature, using his deceptive charm to manipulate fans and rivals alike.