Tecna is 16 years old at her first appearance, and her birthday is on December 16. As shown in the series, Tecna is extremely smart, with an IQ of 150, and loves technology. Sometimes she gets engrossed with technology, and her enthusiasm with the same can be irritating. She is self-confident and a perfectionist. She is always practical and logical, sometimes to a fault. Tecna has trouble expressing her emotions, and bases the majority of her decisions on pure logic, though in the second and third season, she gets over that trouble and is more open and friendly toward her friends. She is selfless and nice to them; she truly cares for them, even if she can't always show it using emotions. She develops emotionally through the series and eventually experiences crying, stating that she never cried before. In Season 3 , she even decides to give up her emotions and love to acquire the Water Stars needed to defeat Valtor . She loves science, experimenting in her spare time by creating numerous techno devices. She also has a photographic memory. She loves computers and video games. Tecna also enjoys playing sports and being active.