This took me around 1hour 20 minutes!
In Portland there are people with a hidden creature inside off them that no one can see unless the Wesen want you too. But a Grimm can see their inner monster all the time!
I suggest you go and watch Grimm, it's an incredible show, even though it's finished now :( (You can find out more about the Wesen online or on the show)
So this list is too see what Wesen/creatures you would be, you can pick them all or even just a few. Just think, you could be a blutbad one day then a Mellifer the next. :D