'All those who wander are not lost'

[Minyatur]

Gandalf is what I would label a wanderer. He is from a group of beings called the maia, and theres even a group of beings above them. Sauron actually was a general to another being at first as well, who was actually a maia as well Morgana.

The Middle Earth series is really just the very tippy top of the entire iceberg of that story. His story is quite interesting. Worth checking out.

Morgana was a Maïa under Manwë like Sauron before he switched camp to Morgoth/Melkor?
Name tells me nothing.

Gandalf true name is Olòrin. Most of middle-earth knew him as Mithrandir afterwards.