Hatred is a soul parasite symbiote, created by Zarethra inside UltSans using UltSans' magic to shape Hatred and humanity's hate UltSans received.
Hatred then fed from UltSans' magic and determination to grow.
Hatred is a cold, distant, calculated, mechanical, and functionally perfect judge. Who executes anyone who has hated or does hate.
Hatred does not target anyone else, as animals or pets, or structures as buildings or any other inanimated object. Those are either collateral damage or tools Hatred use for execution.
Hatred created the layers of hell in UltSans' void as tool to execute UltSans. After all, UltSans is the entire reason of Hatred executing him. UltSans hates himself consciously and unconsciously, and Hatred as the perfect functional judge, simply executes the guilt.