Charlotte has 2 different personalities,. For her kind side I would like her to have a soft and vert sweet voice. For her true nature, she should have an aggressive and rude voice. 

Charlotte is normally perceived as a cordial, authentic girl by most men who interact with her, though she can be quite flirtatious and forward during her courting attempts. However, behind their backs, she is brutish, rough, and potent. She is a ferocious fighter and loves throwing herself into battle without a thought of danger, but tries her best to keep these impulses in check around men. She interacts with her "kind" personality when speaking with men as she has received negative reactions when she showed her true personality to them, which badly affected her self-esteem and led her to believe that she would never be really loved. Her facade does not work all the time however; Xander, Odin and Jakob are able to see through it and Kaze is seemingly unaffected by it. The only male character she does not put up a facade for is Benny, as she feels she can be open with him. In fact, her in her support conversations with him, she actually expresses relief that she can drop the act with him (so long as there's no one else around). Charlotte is particularly skilled in barehanded combat, as Xander notes her skill when she takes down a Faceless without any weapons and was able to fell a tree with a single punch in her support with Corrin. Charlotte also dislikes flattery