Danboard is a fictional character from the manga series 'Yotsuba&!' (Yotsuba to!). Danboard is actually a cardboard robot costume built and worn by the character Miura Hayasaka for a school project, but within the story, Danboard is treated as a robot by Yotsuba and other characters, leading to humorous interactions. Danboard has become an iconic figure from the series, known for its boxy appearance and deadpan expression, and often symbolizes curiosity and innocence in the whimsical world of Yotsuba.