A rakshasa is a demon or unrighteous spirit in Hindu and Buddhist mythology. Rakshasas are also called cannibals.
According to the Ramayana, rakshasas were created from Brahma's foot; other sources claim they are descended from Pulastya, or from Khasa, or from Nirriti and Nirrita. Legend has it that many rakshasas were particularly wicked humans in previous incarnations. Rakshasas are notorious for disturbing sacrifices, desecrating graves, harassing priests, possessing human beings, and so on. Their fingernails are venomous, and they feed on human flesh and spoiled food. They are shapeshifters, illusionists and magicians. Ravana is said to be the king of rakshasas.
In Japan, the rakshasa is known as Rasetsu, and in Shingon is identified as the lord of demons (Rasetsuten) and guardian of the southwest. It is depicted as horse-headed.
"Evil spirits that battle the gods in Hindu lore. They also attack humans. Their hideous appearance symbolizes their evil nature, but they can also change shape to fool humans."
—Strange Journey Compendium
Devil Survivor 2
"Evil spirits that battle the gods in Hindu lore. They also attack humans. Their hideous appearance symbolizes their evil nature, but they can also change shape to fool humans."