Full name Helena Petrovna Blavatsky and founder of the Theosophical Society, she is a Servant in Fate/Grand Order under the Caster designation. Commonly seen with a doll automaton companion that is based on Colonel Olcott. Uses a spellbook that fires beams in battle.
Has a summer incarnation as an Archer where she sports a school swimsuit and wields a magecraft-powered Nerf gatling gun.
Also has a Christmas incarnation in Fate/Grand Order Arcade as a Rider where she wears a woolly hat and fur-lined coat and carries a large sack.
Character Design: Matsuryuu
Voice Actress: Kanemoto Hisako