Dakki Keikoku, known as Keikoku no Youko Hime Dakki (妲己 渓谷の妖狐姫), is a powerful and cunning fox spirit princess featured in the Monster Strike series. Revered for her mystical abilities and intelligence, she often appears as an antagonist or formidable ally, depending on the storyline. Dakki is known for her graceful yet deceptive nature, frequently manipulating events from behind the scenes. Her character brings complexity to the series, challenging protagonists with her strategic thinking and supernatural powers.