[Suzerain of Sheol]

That's kind of interesting, I was talking about the dwarves' appearance with my dad, and he speculated that they made them look that they, rather than the way they appear in the book, so that they didn't look like the Seven Dwarves. :p

And, Galadriel is not the book. She is, however, part of the White Council, which is where Gandalf goes when he leaves the Dwarves' party during the Hobbit. They're fleshing out that storyline in the film and focusing quite a bit on it, so... they're going to have to make up a lot of material. All they really have to go on is a few throwaway lines in the Tales of Years in Appendix B of tLotR.