Concept: a D&D campaign where every party member has been co-opted or replaced by some sort of hostile intelligence; e.g., the fighter has been possessed by a ghost, the wizard is being mind-controlled by her sapient magic ring, the rogue is actually a shapeshifting blob-monster who devoured the original and stole her form and memories, and so forth. Each of them is totally unaware of the others, and believes itself to be the only monster in a group of unwitting human adventurers.
The warlock has been infested by a demonic fungus; her ridiculous hat conceals the giant mushroom growing from the top of her head.
The barbarian is a lizardman who fell victim to a botched reincarnation spell and regenerated as a human.
The druid was actually killed weeks before the party met, and is being expertly impersonated by three dire raccoons in a trenchcoat.
No one knows that the bard’s deal is; she seems perfectly normal to every physical and supernatural test, but pings to detect aberration.
I love them so much because they’re about as sharp as a baseball and their anatomy is ridiculous to the point of them literally being classified as plankton for years because they just sort of get blown around by the ocean and look confused, but because they lay more eggs than ANY OTHER VERTEBRATE IN EXISTENCE, evolution can’t stop them
Why is no big predator coming and gnawing on them?
Their biggest defense is that they’re massive and have super tough skin, but they do get hunted by sharks or sea lions sometimes and they just sort of float there like ‘oh bother’ as it happens
Even funnier, because they eat nothing but jellyfish they’re really low in nutritional value anyway, so they basically survive by being not worth eating because they’re like a big floating rice cracker wrapped in leather.
Perfect example of “survival of the fittest” NOT meaning being some hyper aggressive, muscular manly asshole. This creature fell upon the complete opposite combination of traits and just rolled with it and evolution was like “well, it’s working, somehow".