He suffers from retrograde amnesia and rapid mood swings. Others have a hard time trusting sans due to his worsening psychosis. Despite his psychosis, he still seems to have a defined moral compass, refusing to eat Aliza despite being starved for 7 years until he eventually breaks. After years of no food and magic, he is suffering from overwhelming boredom. He loves psychological humor and torture.Isn’t completly evil.He can’t die.Doesnt eat humans.Didn’t ate anything in 7 years.