Nightmare Fuel / Rental Magica

• The first episode deals with a resurrection ritual that Came Back Wrong, with the deceased return as an Eldritch Abomination.
• Oswald Lenn Mathers in the fifth and sixth episode, who is a formless monster that can use any demonic form he desires...
• Fin Cruda in the last three episode, along with The Dragon, is what could be described as "If Giygas has human form"...
• The giant, floating larva in Sekiren's debut episode. Coincidentally, it actually does have the power to cause nightmares in the show itself.