What is the theme in Bone: Out from Boneville by Jeff Smith?

The power of friendship is a strong theme throughout the novel. Each character in the story has a strong friendship connection to other creatures in the novel, and those connections are often the reason for their survival. Ted, the leaf bug, becomes a friend to Fone. As a result, he offers to take him to Thorne, who helps him find his family, helps save him from the rat creatures, and helps take him back to Grandma after the attack. Thorne, a friend to Fone, helps him to find shelter, escape from the rats, and find his family.