Kyojin (狂人 or 凶人, Kyōjin, lit. "Madman" or "Psycho") is a race of demons appearing only in Megami Tensei II, its remake Kyuuyaku Megami Tensei (Megami Tensei II) and in Giten Megami Tensei. Most of the demons that compose this race are based on deranged humans rather than mythologic beings. According to the Giten Megami Tensei manual, they are possessed by demons, making them similar to various human members of the Foul race. Some of the ones that appear in Megami Tensei II appear to have suffered mutations as a result of radiation exposure.
List of Demons
Megami Tensei II
Giten Megami Tensei: Tokyo Mokushiroku
"Hostile humans who display many symptoms of demonic possession similar to those of schizophrenia, thought to have practically become demons themselves."