She has a very relaxed, upbeat, and cheerful personality, and tends to display a lack of ladylike manners, often seen shoving Tatsumi into her breasts, putting her feet on the table, or consuming large amounts of sake. She serves as a sort of big sister figure to Tatsumi and younger members in Night Raid, often referring to herself as "onee-san". Despite the morally dodgy nature that she can sometimes display, Leone is not one to tolerate injustice, and can be especially vicious to those who commit the most vile of acts. She also enjoys fighting her enemies a lot, as said by Najenda who told her that she needs to change that habit.