"You're human, Charlotte."

After bonding with her even more due to their experiences on the battlefiend, the Avatar (here, a default Male Corrin), reaches out to Charlotte to confess his feelings to her. Outright baffled that anyone would take interest in her after her boorish ways were made clear in an earlier encounter, the Avatar nonetheless reaffirms her that its her humanity that he loves the most about her. This brings Charlotte to tears, to which she happily accepts his proposal and marries him.

Example of:
You Are Better Than You Think You Are