Mix Monster: Tengu x Spriggan

This is a transforming monster.

In his small weakling form, looking into his eyes will cause even a peaceful monk to become enraged and attack him. He can breathe powerful gusts of wind, but before he does this, his belly will expand and his outie bellybutton will shine.

If his bellybutton is pressed, he transforms into a large red brute able to breathe flames. A powerful punch or kick to his anus will cause his bellybutton to pop back out and he goes back to weakling form.

The brute protects himself by holding his tail between his legs though, so a fighter will need to grapple the beast and pull the tail away so an ally can attack the anus.