Voice Reference (1:18): https://www.youtube.com/watch?v=vQ9074Kl3iY

From the FE Awakening Wikia:

"Sully is a member of the Shepards and was born into a long line of Ylissean knights. Sully is a tomboy. She possesses a personality that is characterized by a spirited zealousness, brimming with self-confidence and passion - a fact that has caused her to be regarded as being cooler than most men, earning her the admiration of many a woman in Ylisse. Such a fact is concretized in her supports with Miriel, who notes that her language is rather brusque and vulgar, alongside her general character being one that is aggressive, traits that are stereotypically instituted as hallmarks of masculinity."

She is a rough-and-tough type of person, but does have some insecurity in regards to her femininity. She has a Medium to Low voice type.