In the archetypal sense, Bilbo is a hero. He embarks on the Hero’s Journey and does go through all of the phases. In many cases, the archetypal hero is not what we would consider heroic, at least to begin with. The hero often gets pushed along on his adventure, as Gandalf does for Bilbo. Few archetypal heroes actually go searching for the adventure or journey. The journey is a difficult and painful process, full of danger and mistakes. Bilbo makes plenty of mistakes, but in the end he does change and mature. In essence, the archetypal hero is willing to put his mission above himself. This hero is able to sacrifice his comfort (no small feat for Bilbo) and even his life to save others.