Quess is selfish, stubborn, emotionally sensitive, intelligent, naive, and love obsessed. Quess was born as a latent Newtype. When she wants to have something, she'll demand for it and believe it's rightfully hers even if she can't have it. Even though there are people around her to remind her about manners and respect, she doesn't listen well, and people tend to tolerate her or excuse her due to the fact she's still a developing teen.

She developed a crush on Amuro Ray and often shows her affection to him. Despite her lack of interest, she received the unrequited affection of Hathaway Noa. When she was taken in by Char to train her as a MS pilot, she was completely enthralled by Char. He was able to take advantage of her distaste toward the Earth Federation government to manipulate her into helping Neo Zeon. She's occasionally shown to care about the well-being of others, but she's often emotionally overwhelmed by her own feelings and quick to act upon them without proper wisdom or guidance.