Well, I have a theory on Sumia, that being that her options are limited because that way you don't have to 'sacrifice' a girl to marry Chrom every run while you're filling the support library.
That aside, Henry/Gangrel and AversaTharja; one's them talking about the old days, with Gangrel regretting what he did and Henry being himself and the other is 'who's a bigger yandere'