Natsuko Yokosawa (横澤夏子), or just Yokosawa, is an office worker and a supporting character in the 1-minute TBS Television shorts. She also makes several, silent cameos in the Netflix Original series.
She is the only character whose full name has been revealed.
Yokosawa's appearance is based of the Axolotl, specifically the Albino morph. She has light pink skin, peach external gills, and a transparent caudal fin. Yokosawa wears the typical accounting office uniform consisting of a matching blue vest and skirt, white dress shirt, and black shoes.
Yokosawa is very perky and loves to talk. She is renown for interrupting others while they're talking to her with sudden thoughts and topic changes irrelevant to the conversation.