Undead

Shiki (屍.鬼, lit Corpse Demon), or sometimes simply referred to as Zombie or Grave, is a race of demons mainly composed by the undead, in the Shin Megami Tensei series. They are typically enemy only demons who employ Physical or Dark attacks and are weak to Fire and/or Light attacks.

Megami Ibunroku Persona
Instead of being referred to as Shiki, the race is referred to as Grave.

Persona 2: Innocent Sin
Instead of being referred to as Shiki, the "arcana" is referred to as Zombie. Zombie enemies are not obtainable by any legitimate means and appear as enemies in the Air Raid Shelter.