Maarken
A Maarken is a guy who shows up uninvited and never leaves. He eats your food, takes your couch, and thinks your dog is his. He's like a human version of a raccoon who doesn't know when to stop eating.
He showed up and ate my last sandwich. He didn't even say thank you.
He took my couch and now I have to sleep on the floor. It's unfair.
He took my dog for walks and now my dog thinks he's my brother.