Duralumin is a recurring fictional character in Yotsuba&! (Yotsuba to!). He is one of the neighborhood children and a friend of Yotsuba Koiwai, appearing in the series’ everyday slice-of-life stories. Like many characters in the manga, he helps create the playful, lighthearted tone through his interactions with Yotsuba and the other kids. His role is minor but memorable, contributing to the series’ depiction of childhood curiosity, imagination, and simple daily adventures.