茨木童子

One of the evil oni that rampaged in Kyoto back in the Heian period. A subordinate to Shuten-Douji of Mt. Ooe, she crossed paths with Watanabe-no-Tsuna when Minamoto-no-Raikou led her retainers to defeat the oni of Mt. Ooe. In the tale of Rashomon, she appears in the form of a beautiful woman.

(Source: Fate/Grand Order Wiki)