What ? Do you mean Puck isn't important ? By the way, both of them bring to the mangas Fun, and Fun is an important part of a Mangas even if it's a dark one like Berserk. The reader can make a pause, laughing a little, take a lill break. Ishidoro and Puck are like Jar jar in Star Wars episode 1 ( sorry for the comparaison ) funny but not that important ( for the moment ) ...