The changes and developments in Odysseus' character are an essential part of the story. All throughout his journey, he's presented with all kinds of adverse situations that lead him to adapt his personal qualities in order to overcome them and succeed.
We see this in the harm that pride causes getting in the way of his plan to surpass Polyphemus; after which he starts to become more resiliant and focused. Also in the hopelessness he felt trapped on Calypso's island; which after the escape injected him with a tremendous will-power that would lead him back home, as well as a renewed sense of pride in his own intelligence and abilities.
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