Nagahide is usually quite friendly and soft-spoken. She is usually seen smiling, and even takes her cheery personality to the battlefield, where she will greet her enemies with smiles. She shows a high degree of self-control, and is even able to keep her cool while being threatened by Kastuie. It is not as if she isn't prone to angry outbursts, however, as she berates Nobuna and Yoshiharu for having a "lover's quarrel" in front of Asai Nagamasa; and breaks her almost timeless relaxed demeanor. She enjoys playfully teasing those around her, such as when she makes fun of Yoshiharu when Nobuna dubs him "monkey" (サル), and usually tries to lighten up the mood in serious situations.

Being Nobuna's tactician, she is very intelligent and insightful. She is able to tell immediately that Nobuna is troubled by Dousan's decision to die in battle. One of her notable quirks is that she rates, actions, comments, and anything else she finds amusing with "points" (点 ten), with the higher number being more favorable. This is most likely because, as a tactician, her job is determine the best course of action to take.

LIke all of her retainers, Nagahide is extremely loyal to Nobuna, and can't fathom the idea of her princess being used, or being given up on in any way. In fact, she even awards "0 points" when a general suggests surrendering and giving up Nobuna. She greatly disapproves of Matsunaga Danjou's methods as well, since they can do more harm than good, though this is justifiable as Danjou is both dangerous and has a very loose grip on reality, so much so she refuses blatantly to perceive the difference between dream and reality. It's worth noting, she herself admits that she is not a strategic genius like Hanbei, and notes that there is a difference between an advisor and a strategist(she is the former).