There is a set of novels for R2 that are similar to the ones for R1, of which only the first one's been released so far (see Koshimizu's merchandise list). The first one is written from Nunnally's POV and contains a little information about the Vi Britannia children, Marianne and their relationships with some other members of the royal family, such as Carine and Clovis' mother, Gabrielle, but doesn't go on in detail about Marianne herself much.
I'm not really up to doing a detailed translation for this series because they're significantly longer than the Knights of Rounds stories, but someone mentioned awhile back about there being discussion on them on the Gamefaq boards, so you might want to look there.
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I'm not really up to doing a detailed translation for this series because they're significantly longer than the Knights of Rounds stories, but someone mentioned awhile back about there being discussion on them on the Gamefaq boards, so you might want to look there.