He moved in a few days ago. Didn't ask for permission but I guess that was a cultural misunderstanding - open door probably means that he is invited. Luckily he is very quiet so that's fine with me. He also doesn't like photo sessions so it was not easy to get a halfway decent picture of him.
We still have a few communication problems so I don't know his name but I just call him Godzilla (he must be a fighter since he lost part of his tail).