Terra, Tina, Miss Branford, The Girl Who Pilots The Magitek Armor, The Girl Who Transforms Into The Esper With The Hot Ass, The Esperkin, and any other nickname you like. IMO one of the best characters in the franchise, deep characterization, lovely design, awesome battle skills, and a shadowy counterpart to Kefka, serving as an example that she could become just as emotionally detached and power-hungry as he is. The best hero-villain pairs are when one represents what the other one could or might be in another life, and with Terra especially it underscores how far she comes, that she's on the edge of becoming just like Kefka and then finds something to ground her and make her a true hero.