Danbo is a fictional cardboard robot from the manga series 'Yotsuba&!' created by Kiyohiko Azuma. The character is actually a costume worn by Miura Hayasaka, a friend of the main character, Yotsuba Koiwai. Danbo's simplistic, boxy design and the humorous situations it finds itself in have made it iconic within the series and popular outside of it. The character often appears in whimsical scenarios that highlight the innocence and curiosity of childhood, reflecting the overarching themes of discovery and wonder present in 'Yotsuba&!'.