I feel like Claire would try to reach out to Harbor about what to expect with a new baby and it would go Badly because Harbor does not have to imagine what it would be like to fight for an infant's life with no resources or experience but he also cant relate to the pregnancy thing at all so he's both very unhelpful and the most practical and well meant advice he does have comes off as miserable doomerism instead of radical gratitude.
Since Harbor boarded Oceanic 815 under a fake ID and it isn't traceable to whoever he used to be the Others don't have a complete file on him which raises all kinds of alarms but since he has a baby and they're trying to scope the kids out anyways Ethan investigates him too but Harbor just doesn't have much to say.
Harbor doesn't go in for the fate/destiny thing like Locke does but he is even more laser focused on the idea that they might belong here because it honestly isnt about him anymore. If his "purpose" was just to get the baby on the plane and then die here he would consider it Correct as long as Ellie got to stay and survive.
Harbor also moves to the caves ASAP because he is not at all concerned with "rescue" and very much concerned with adapting to Island life as fast as possible so he can teach Harry when they grow up.















