kiichi hogen (fate)
Assassin-class Servant from Fate/Grand Order first appearing in the Little Big Tengu event. She was an onmyouji tengu and the mentor of Ushiwakamaru. She can shapeshift her form (and gender) at will, with her form as a servant being her most commonly used appearance.
Character Design: Oomori Aoi
Voice Actress: Kakuma Ai