Infinitum is a tall, lean aarakocra with bronze and russet feathers arranged in subtle scale-like bands along the neck, shoulders, and breast. Their wings are broad and carefully groomed, with several pale feathers deliberately braided with red and gold thread. Within a minute of meeting them, most people notice that Infinitum rarely looks directly at faces. Their attention moves instead to hands, doorways, windows, and the open space above a person's head. When waiting, they balance on the balls of their feet with their weight slightly forward, as if every conversation might end in sudden flight.

Infinitum is calm, observant, and unfailingly courteous, but their curiosity is relentless. They treat every disagreement as a puzzle with an underlying structure, and they prefer questions that make people reconsider their assumptions. Beneath their composure is a bright, almost childlike delight in sunlight, old books, unusual creatures, and discovering that two apparently unrelated things share the same shape.

Infinitum was born beneath a sky of red storms, among an aarakocra clan that measured time by the turning of constellations and the migration of cloud banks. Their first memories are of scales, not feathers, because their caretakers wrapped them in a ceremonial mantle patterned after the ancient sun-serpents. The mantle was meant to symbolize endurance, but Infinitum took it as a promise that the sky could hold more than one shape. They grew fascinated by the harmony between claw, wing, scale, and flame, and began asking questions that their clan answered with silence.