Contrary to Nistro's high-spirited personality, Dextra is a very level-headed and serious person. Her cold, calculating demeanor is demonstrated by her admonishing of Nistro for his more casual and impulsive attitude. She shows little tolerance for recklessness and handles things in a cool, professional manner. This personality is also reflected in her Dueling strategy, as she is precise and calm in her tactics. Additionally, she seems to only move in when her opponent is weakened, also representing how she considers carefully before she makes her move. This is also seen when she followed Tombo Tillbitty's actions throughout the World Duel Carnival, only approaching him once she had knowledge on what he had been doing.[1][7]

Although she criticizes Nistro often, she has shown concern for him, such as when Hart Tenjo unleashed his powers while Nistro was in range.[10]

Despite her initially icy and indifferent persona, Dextra has also shown deep concern for Kite when she found out that the repeated use of Photon Transformation was weakening him, up to the point of urging him to give up the World Duel Carnival Finals.[11] It was shown that she fell in love with him when he saved her once.[3] In Spartan City, Dextra is more friendly and carefree as she often smiled at others.