As a human, Favilli is a girl through and through. She wears sun-dresses and a child's robes as befits a young girl living in a tropical Nidus, often in rusty oranges and reds. She keeps light sandals but she doesn't run around very often, so they're hardly scuffed and never stained. Her round face is gold, as is the rest of the skin on her body, and her hair is yellow-tipped orange. Her eyes remain yellow. She often wears a bow in her straight, thick hair.

Intelligent from the very start, Favilli began to haunt the Nidus' small library as soon as she picked up the ability to read. She's made such a nuisance of herself that she's been 'promoted' to librarian's helper, and she spends quite a bit of time sorting and reading through what annals and other writings the Nidus has to offer.