What is the fine-grained topic of the following text: In Pompido Panda and the Balloons you will find not only the main character Pompido, but also all of his friends, Gongo Gorilla, Picaboo Polar Bear, Tiggly Tiger, Hippolo Hippo, Lolo Lion, Bo Rhino and last, but not least, Rocko Crocko. Only return the topic.
Characters in the book "Pompido Panda and the Balloons"