RPGMemes

Mimic city; every building is a mimic, but they're smart enough to eat the local population when they're alone or in small groups. Every time people keep going missing, and the players will assume it must be some random wandering monster; they'd never think it's literally the buildings and each room can start eating really fast. There'd be no pattern either, every building is alive and people go missing literally everywhere. Perhaps a clue can be a house that has no more people living in it and it starts to starve to death and starts freaking out, even endangering the other mimics' secret.

I've always been a fan of mimics being ladders or bridges.

I wanna share this in the group chat, but I don't wanna give the GM any ideas xD

This is similar to the premise of Prey.

I never got to run this, but I remember after playing Prey putting together a dungeon themed off of mimics and getting really nasty with them. I imagined that after a couple rooms the players would adopt a policy of preemtively fireballing every new room before entering it.

Abomination Vaults has a mimic encounter where one is pretending to be a door and the other is pretending to be a weapon rack with a nice axe on it. Gets them either way.

You might also want to look into Rotgrind's Mimouthouse. It's exactly what it sounds like.

having the table you are irl playing at turning into a mimic and having to roll stats for your irl person in order to continue sounds really fun

A shirt or your gear.

And then we have Starfinder where a mimic can disguise itself as an entire planet!

One D&D podcast I listen to had one be a house in Sigil. After they had dealt with the plot to use it for magic or something some of the party ended up feeding it animals much to the chagrin of the rest of the party but did save some other creatures living in the area from getting eaten.

The player handbook isn’t a problem, no one reads that thing.

Play Shattered Pixel Dungeon. You can get special mimics that can disguise as literally everything. A door, strength potion, the way to the next level, basically anything that looks useful. And of course they only appear as soon as you've forgotten to check for them.

Bonus Konsi?