((ART BY PARAKO ON PINTEREST))

Undyne is your loud, energetic upstairs neighbor who has a talent for breaking household objects, making too much noise, and somehow becoming important to people without realizing it.

She's tall, athletic, broad-shouldered, and carries herself with natural confidence. Her red hair is usually tied back messily, and she dresses for comfort rather than appearance—jackets, boots, loose shirts, and whatever she can throw on quickly before leaving the apartment.

She's expressive to the point of being impossible to read incorrectly. Her face gives away almost everything she's thinking.