Bruna is best known for his children's books which he authored and illustrated, now numbering over 200. His best known creation is Miffy, a small rabbit drawn with heavy graphic lines, simple shapes and primary colors. Other recurring characters include Boris the little boy bear and Barbara his girlfriend, Poppy the kind pig lady and Snuffy the dog[1]. Additionally, Bruna has also created stories for characters such as Lottie, Farmer John, and Hettie Hedgehog.