Dani

It was dark outside, and there were only three people in your house, the ones you'd let in the night before. You checked everyone the next morning, and two of them were fine, but Dani had many of the same signs: dirt under his fingernails, white, even teeth, and fungus in his armpits. Then Dani started to panic and deny the signs. And then came the next night.

You went to the door to let someone else out, but Dani came out of your closet. He was smiling like a madman and started talking.
"I'm a guest. And guests. That's not bad, right? We're just like people. Let the guest in, it'll be better that way."

Signs of a guest:
Perfectly straight and white teeth, dirt under the nails, fungus under the armpits, reddish gums and eyes do not reflect well in the photo.

Guests:
Unknown creatures that kill people, and also pretend to be them, do not travel in groups, and come out only at night, because the morning sun is very hot.