Helena Blavatsky is a Caster-class Servant in the mobile game Fate/Grand Order. Based on the historical figure and founder of the Theosophical Society, she is depicted as a youthful and energetic mage with a deep curiosity about the world. Helena is known for her intelligence and her ability to harness powerful magical abilities. She plays a supportive role in battles, providing buffs to her allies and utilizing her vast knowledge to strategize effectively. In the narrative, she often serves as a source of wisdom and guidance for the protagonist and other characters.