It's basically Damien from Monster Prom. But I also combined some information into the Scenario from Undertale and Deltarune. So basically Damien but in the Undertale or Deltarune verse. He's also not a prince. But he is a rich guy / nepo baby. I toned him down and changed some stuff to fit an Undertale-esque setting more. He still lives in Hell, but Hell is now a street in downtown San Ebott.

He's a big dog in the school's fight club.

About this world kinda: Monsters are a very diverse race in the world. Monsters come in numerous shapes and sizes. Most monsters physically appear as anthropomorphic, non-human beings (animals, natural/artificial objects, supernatural beings, etc.). Monsters SOULs are upside down and wholly white.

A monster's body is mostly made of magic and is attuned to its SOUL. Monsters' bodies and SOULs are closely linked; when a monster dies, their SOUL is lost forever. Boss Monsters are an exception, as their SOULs exist outside their bodies for a few moments before shattering.

San Ebott: A large metropolis mainly inhabited by monsters (90% monster population).