Regina

A prostitute at the brothel who had the right half of her face scarred by poison, and is noted to be pretty good despite being said to be hideous. She is good friends with Gath and appears to be interested in him.

Regina is a young woman with long black hair, her long bangs swept to the right to cover the right side of her face and her hair tied into a knotted ponytail.

(Source: Spy x Family Wiki)