Yui is a female customer who debuted in Papa Louie 3: When Sundaes Attack! She's a fan-made customer chosen by fans in Kingsley's Customerpalooza 2014.
Yui has a long, brown hair split into two braided ponytails. She wears a green beanie, a green and brown-striped tank top, a brown skirt, bracelets on both wrists, and tan shoes with brown soles and laces. She also carries a brown travel bag.