Theresa Apocalypse is a central character in the action-packed game and anime series Honkai Impact 3rd. As the principal of St. Freya Academy, she is a key leader and mentor to the Valkyries, guiding them in their battle against the Honkai. Despite her youthful appearance, Theresa is over 50 years old, a result of her unique background as a clone created by Otto Apocalypse, her grandfather. Known for her cheerful yet determined personality, she wields the power of the Divine Key, Oath of Judah, and plays a crucial role in the fight to protect humanity from the impending threat of the Honkai.