Don't know about the nipple-blood suckers, but I think the Christmas character you're referring to is Krampus, a black demon who kidnaps naughty children and eats them. In case you, or anyone else reading this, might happen to be interested:maxben said:Some of the more esoteric Germanic mythological beings are missing though, like that one that sits on your chest and sucks blood through your nipples (explanation of night paralysis and breathing difficulties) and that Christmas character that's black (I forget what he is called or what he does).
http://en.wikipedia.org/wiki/Krampus
I remember I had an illustrated childrens book with him in at when I was little. Scared the crap out of me at the time.