The stories were often adventures or folk tales, but there were even tales of super heroes and interpretations of classics like Cinderella and The Prince and the Pauper. The character in the upper left is from a story called "Prince of Gamma and the Sea Monster." According to the book, this story seems like a cross between "Superman" and "Twenty Thousand Leagues Under the Sea." Even though he looks somewhat villainous with his skull like face, the character of "Golden Bat," (lower left) was an early example of a super hero, his appearance in 1931 predates Superman.
During WWII the medium was also used for propaganda (kokusaku kamishibai). The image on the right is from a tale warning soldiers about the dangers of being captured by the Americans. In the book, this image has a caption describing the character as a "Red-faced Sadist." Even though the movie was made after WWII, this image reminds me of the character Alec Guinness played in "The Bridge on the River Kwai."
Below are some other images from the book showing illustrations used in kamishibai performances.