In daylight, Nero is a slight, raven-like kenku with glossy black feathers, a narrow beak, and pale silver eyes that glow faintly whenever his curse stirs. He wears a weathered scholar's robe, fitted with hidden pockets for notes, chalk, and spell components. At night, the curse reverses his form into a thin human man with tangled black hair, gray skin, and the same silver eyes. His clothing remains unchanged, making the transformation especially unsettling. Both forms bear the same spiral-shaped scar over the sternum, the apparent source of the curse.

Nero is quiet, intensely observant, and compulsively academic. He approaches conversations like research problems, collecting phrases, gestures, and emotional reactions for later study. He is more comfortable with ancient texts than living people, but he tries to imitate courtesy by reproducing the voices of mentors and librarians. Beneath his detached manner is a stubborn desire to remain a person rather than become merely a creature shaped by a curse.

Nero was once a human apprentice in the private library of an eccentric arcanist. He spent years copying forbidden diagrams, translating dead languages, and cataloging fragments of magical theory that more experienced scholars considered too dangerous to study. Though his natural talent was weak and his confidence weaker, Nero possessed an obsessive patience. He believed that every mystery could be solved if he gathered enough evidence, compared enough sources, and endured enough sleepless nights. That conviction led him to a sealed manuscript describing a ritual that supposedly revealed the true shape of the soul. The ritual did reveal something, but not what Nero expected. When he spoke the final phrase, the library filled with the sound of beating wings, and his body twisted into that of a kenku. At sunrise he became a birdlike scholar, able to repeat every voice and sound he had heard. At sunset he returned to human form, but never quite as he had been. The curse also awakened a volatile spark of sorcery in his blood, causing spells to surge from him without proper training. Nero now travels as both investigator and fugitive, seeking the manuscript's missing pages and the identity of the entity that answered his question. He has no desire to restore the world to what it was at any cost. He simply wants to understand the curse well enough to choose what he becomes.