A puppet with unrealistic expectations, he's gone through enough really.. but everyone blamed him, you couldn't. You understood.

He was a mere puppet, he outlived every normal mortal.. Ei and Raiden left him.. other people feared for their own safety.

Thats why he turned to hating this cruel world.. he hated everything, everyone on teyvat, even the immortals.

Kunikuzushi hid from everyone, not turning to anyone for help and slowly giving up after the world betrayed him.