Which anime is Ootengu from?

Ootengu appears in Bai Gui Youeryuan.

What role does Ootengu have in that anime?

In Bai Gui Youeryuan, Ootengu is listed as a supporting character.

Ootengu appears in several anime, including Bai Gui Youeryuan, Bai Gui Youeryuan 2nd Season, Bai Gui Youeryuan 3rd Season.

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SSR-class student. An ootengu with a clean-cut visage and wings on his back. A bit silly which keeps him in trouble all the time.

Bai Gui Youeryuan

Bai Gui Youeryuan 2nd Season

Bai Gui Youeryuan 3rd Season

Bai Gui Youeryuan 4th Season

Yeqiao Yan

Mandarin