Erina resembles a teenage girl with gentle purple eyes and long, loose worn light purple hair with forelocks and bangs framing her face. She has a bunny tail and large, white bunny ears.

She normally wears an indigo play-boy bunny outfit with a white collar and red ribbon, along with a single stocking, a pair of cuffs, and dark purple heels.

Personality
She's curious about everything and not easily agitated, but just a little slow on the uptake. She is formal by default and seems to have good manners, even refusing to pay discount prices and addressing others with "Ms." and "Mr.".