Which anime is Catfish Monster from?

Catfish Monster appears in You Shou Yan.

What role does Catfish Monster have in that anime?

In You Shou Yan, Catfish Monster is listed as a supporting character.

Catfish Monster appears in several anime, including You Shou Yan, You Shou Yan 2nd Season, You Shou Yan 3rd Season.

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Mythical beast living in the pond by Sibuxiang's shop.

You Shou Yan

You Shou Yan 2nd Season

You Shou Yan 3rd Season

You Shou Yan 4th Season

You Shou Yan 5th Season

You Shou Yan