They look like weasels with a sickle like claw on its paws. They would travel in three’s and would move very fast while riding a whirlwind that you would not be able to see them. These three weasels have their own tasks to do. The first one would make the human fall. The second would cut the human with its sharp claws. Lastly, the third would put its magical medicine on the wounds so that none of the blows are fatal on the victim.
No one knows why they do this. Maybe they’re like vampires that need blood to survive or they’re just doing this for fun. We don’t know. But if you do trip during a windy day and found that you have cuts on your legs thats not bleeding, you might just be one of the victim of the Kamaitachi.