Xing Hai is a powerful demon necromancer who dwells in the Night Devil Forest, and a major supporting character in season 1 of Thunderbolt Fantasy. Lin Xue Ya recruits her in order to cross the Demon Spine Mountains. She initially refuses, but changes her mind after learning their goal is to acquire the Tian Xing Jian. However, her true motive is to awaken the sleeping demon god Yao Tu Li. The post-credits scene for Season 2 suggests she will be a major antagonist in the third season.

In an Eastern-styled fantasy setting, a brother and sister team of sacred guardians is beset by the Xuan Gui Zong, minions of Miè Tian Hai, who seeks the Tian Xing Jiàn sword that they possess. Hai's appearance leads to the defeat of the brother, but his sister, Dan Fei, jumps off a cliff to temporary safety. Later, a wandering swordsman comes across a ruined temple, where a statue of Buddha is protected by an umbrella against the rain. When he takes the umbrella for himself, a man resting under a tree nearby informs him that he must be compassionate to the next traveler he meets as a trade-off for taking the umbrella. That next traveler is Dan Fei, still being pursued by the Xuan Gui Zong minions. Both his promise and the enemy's sorcery leaves the wanderer unable to avoid getting involved. 
 
(Source: Anime News Network)

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Her younger brother [Takashi Oohara](https://anilist.co/staff/96636/) is also a voice actor.

__Non-anime roles:__
- Harran - Goddess of Victory - Nikke (VG)
- Ningguang - Genshin Impact (VG)
- Mikasa - Azur Lane (VG)

The fourth season of Thunderbolt Fantasy: Touriken Yuuki.

In an ancient kingdom, a vicious warlord is on the hunt for a magic sword. Dan Fei has spent her whole life guarding the coveted Sword of Divine Retribution–legends say its power is great enough to smite demons and shake the heavens. The master of the evil Xuan Gui Zong sect will stop at nothing to possess it, and dispatches his warriors to steal the holy blade. Fleeing their pursuit, Dan Fei must rely on the unexpected help of two unusual strangers, who are powerful swordsmen themselves. Like a thunderbolt from the blue sky, a thrilling wuxia fantasy saga begins! 
(Source: Seven Seas Entertainment)

A side story of Thunderbolt Fantasy from Dan Fei's perspective.

Hai Xing