Insanity Devils

Insanity Fiends are a series of FIRE Fiend type monsters who revolve around summoning themselves when a specific condition is met with activated effects that are mandatory. These summoning conditions tend to activate when a card leaves the field or a specific phase is entered when a condition is met

Appearance
The series is split up into 2 parts. The Fiends and their support. The Fiends have the appearance of vaguely humanoid creatures who's main body is Black with multiple shades of red and orange higher up on their bodies (usually their heads). Their name partly gives away their appearance. This is best shown in Skeletal, Malformed, Lurking.

The support has 2 different design aesthetics. The first being humans who are mostly covered and by the same substance that the Fiends are made of. The second one being Close up of heads who seemingly are expelling the substance the Fiends are made of.

The name of the monsters (both Fiends and Support) hint at a state of mind like Insane, Wailing, Feral which alludes to Insanity or phobia people have such as Giant, Framing, Capturing which alludes to Cameraphobia

Each Support member (except Loving, Protecting, Caring) also has a accompanying Spell/Trap that supports FIRE Fiends. These are based on concepts mainly found in Horror fiction such as Star-Fallen Fortress alluding to a an interstellar/interdimensional virus