Baby is the youngest member of the Saja Boys, a demon idol group serving their king Gwi-Ma, and is known for his childlike demeanor paired with unsettling powers. Despite his name, Baby Saja is just as dangerous as his fellow demon bandmates.

In his demon form, Baby Saja has glowing golden eyes with slit pupils, claws and fangs, sharp features, and pale blue-tinted skin marked by dark, vein-like patterns that glow faintly under neon light. His short hair remains a cool-toned blue-gray, but appears sleeker and more stylized. He wears traditional Korean clothing for the grim reaper (저승사자/Jeoseung-saja) such as a large, wide-brimmed black hat (갓/Gat) and dark clothing (Hanbok) adorned with elegant beads and chains. His seductive expression give him an eerie, otherworldly presence. This form radiates mystery and power, with a striking and intimidating aura. In his human form, Baby Saja has short, fluffy blue-gray hair and pale skin. His eyes are sharp and expressive, giving him a confident and slightly sassy look. He wears a mustard yellow newsboy cap tilted and brim facing at the back on his head, and a fuzzy hot pink sweater with a diamond-patterned argyle design in light and dark pink. Underneath, he has a dark blue collared shirt. His overall look is stylish and playful, with a bold fashion sense that contrast his personality.