Welcome to the board, Misanthrop!!! Guten Tag!!!
Your english is very good! Far better than what I might be able to cobble together if I tried to remember my high school German class!
We've had quite a few players set various challenges for themselves in replaying the game to increase the difficulty level. Some have used strict rules about what they could or could not do in developing their characters. You might be able to find some of these threads by searching on "solo" but since some of these players are still active on the board, I'm sure they'll post some tips/ideas soon.
It does seem to me that there has been so much more emphasis on graphics and other computer bells and whistles that some of the excellent fun that was present in earlier and cruder CRPGs has gone missing. I've found myself far less "involved" in the more recent Computer RPGs than I was 10 and 15 years ago. W&W has been one very happy exception to that trend.
As for monsters - I never bothered to keep a list of what monsters I met in the game. I have a copy of the "Tome of Misinformation" (otherwise known as the official strategy guide) which lists all (?) the monsters in the back which I presumed to be close enough to the truth. We do have a thread going gathering the names of unique creatures in W&W but I think you were looking for monsters that are unusual but not necessarily one of a kind. One of our early posters put together a beastiary which was online but none of the links I had to access it seem to work any longer so it would appear to no longer be available. I'll search around and see if I can find it.
Wyv