Grisellinia littoralis at a guess.
There are a lot of things which eat leaves to skeletal remains. Some people have described the smell from these grubs as being like Cat urine. As I said, all you can do is spray with a contact insecticide. Not keen on using them myself, but sometimes you have to.
I would go with a Calceolaria for the first one too.
Does the Viburnum smell appallingly bad? If so then you have a Viburnum beetle infestation. You need to spray with a contact insecticide on the under side of the leaves too.
My favourites, the Sweet Williams
total guess. Styrax japonica?
Sorry to disagree but that looks more like Sedum confusum (as used to be, changed its name to something else recently but my brain has not caught up yet).
Typical, one I knew when Nutcutlet didn't and was beaten to it!
Google Aroids and go to Images, there are a lot of them out there.
NC. I was about to suggest S. venosum, but I had to go and do some gardening. Gets in the way of everything!
What size is this?