I've always like the idea of urban mimics who look like generic toys, every year they disappear to molt colorful paperlike skin to take the shape of a new item that sits around a house ignored/not worth throwing away, kobold sneak through the cities and rescue the ones that actually get thrown away
They shapeshift small wheels, and move like roombas.
In case of dungeon self-destruct, they pop out bigger wheels, and with an engine noise they leave skid marks as they race for the exit.
Surely they can transform into something with legs Or maybe even wheels. Although Mimics are ambush predators, their prey comes to them so they don't need to move most of the time.
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In case of dungeon self-destruct, they pop out bigger wheels, and with an engine noise they leave skid marks as they race for the exit.