Voice Reference (3:17): https://www.youtube.com/watch?v=vQ9074Kl3iY

From the FE Awakening Wikia:

"Maribelle is a member of Chrom's Shepards, and is the daughter of the Duke of Themis, an influential noble family in Ylisse. Maribelle is a typical noblewoman, trained in the classical and finer arts of the higher ranks in society. Ironically, this has sparked within her an interest in the "plebeian" lifestyles of the common citizenry of Ylisse, in turn motivating her aspiration to become a magistrate that fosters equal rights between both the nobility and the common folk alike. She tends to come off as being snobbish and prideful, warming up rather slowly to others. Once she has developed a fairly intimate relationship with a given individual, she becomes much kinder and is more sensitive to the emotions of the other party."

If you searched the word "nobility" in the dictionary, you'll find a picture of Maribelle next to it. While snobbish, she takes into consideration the feelings of all others and works to understand them. I'm unsure what accent she has so for the role, the accent in unnecessary (points in your favor if you know it). She has a High to Medium-high voice type.