It could be said that Aeneas changes in that his resolve is
strengthened. Aeneas is particularly changed after his experience
in the underworld.
One thing that makes Aeneas interesting is that his personality
changes over the course of the book. Sometimes, people act as if
character development was an invention of modern literature, but
this clearly isn't true. In the first half of the poem, Aeneas is
dedicated to his quest, sure, but he's still a little uncertain
about it.On balance, he seems to think that the positive aspects of
his life are outweighed by the negatives. You can tell he's feeling
this when he asks his father Anchises in the underworld why anyone
would ever want to be reborn after they die.