Cave crickets.

I'm case you don't know what a cave (or camel) cricket is, chances are you haven't gone into dark corners of your house. A cave cricket would be cool because cave crickets can be part of the village and pillage update, because the main idea of the update of that name is villages, and there aren't many animals that spawn there exclusively! Cave crickets would have a brown and tan spawn egg (tan being the egg itself, and brown being the spots) and when spawned will have long grey antennae, are 1 corner of a block in size (about half the size of an end mite) and have a tan body with brown stripes on the top. They of course spawn in villages and dark parts of the player's house, which the player can stop by making a big trap. the recipe would be 3 paper, one on top of the grid and two more as well, one on each top corner. then put a phantom membrane in the bottom middle part of the grid and you will get a white but trap, which cave crickets, cats, both types of spiders, and dogs, get stuck in. Cave crickets are non hostile, have long legs, and goes from all mob types except for eachother. They are tamed with wheat or apples and breed with carrots or apples. 1 out of 100 can be red and black, which also results in these red and black types being hostile.  the "hostile" red and black cave crickets deal 1/2 a heart of damage.

And that is what a cave cricket in Minecraft would do.