Sevianthan is Charlie's ex-boyfriend. They previously dated during their younger years until some years ago. They don't share the same views, he is very pessimist about Charlie's idea of Hazbin Hotel, but they are still friends. He is a "Big jerk chad, kinda evil and ignorant, but charming funny"
Seviathan has dark bluish gray skin and dark green hair with gray roots. He has dull red eyes with neon green irises. He has thick eyebrows and his mouth is filled with neon green colored sharp teeth.