You've got Thor and Loki and Ordin... (mostly gleaned from The Mighty Thor comic from Marvel), Odin is the dad, Thor and Loki are brothers, and although Thor isn't that bright, he's pretty straightforward, and although Loki is pretty much a big liar, every once in a while he does something good.
There are Ice Giants (again, Marvel Comics)
There's a terrifying Squirrel (shown best in the comic series The Unbeatable Squirrel Girl - also a Marvel comic)...
J.R.R. Tolkein used a bunch of Norse Mythology when creating Middle Earth.
....and, yup. That's about it.
So when I read Neil Gaiman's latest, Norse Mythology, I wasn't exactly sure what to expect. What I got was a pretty nifty overview of the topic, from creation myths straight through to Ragnarok - the end of times for the Norse gods.
The stories are all quite readable, a lot of fun, and educational in a way I wasn't expecting. It definitely left me interested in finding out more, which for a book of this type, is pretty much the goal.
A great read!