For me, it’s Sasha from “Attack on Titan”. As soon as she’s introduced, you can tell she’s a super funny character that will be the perfect comic relief in such a heavy series. She’s seen eating a potato and being yelled at by her trainer when she joins the training for the survey corps. I think that Hajime Isayama, the author of the original series, knew that by making her do something unserious in a serious situation, she would immediatly be a light in the series.