Gandalf was sent for a task, and that task is to thwart Sauron, and bring about his destruction. Gandalf is actually Olorin the wisest of the Maiar spirits from Valinor. He was sent over with 4 others to stop Sauron's evil. They were sent in the forms of old men. Gandalf wants to use others to fight Sauron
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Sir Ian McKellan, who played the role of Gandalf in the films, has publicly announced that he is gay.
Gandalf Three wizards played a direct part in The Lord of the Rings (movies and books): Gandalf the Gray (and later the white) Saruman the White (and we know what happened to him) Radagast the Brown -- birds, trees flowers were his specialty. Two others were mentioned obscurely. They were the Blue Wizards, Alatar and Pallando.
Frodo knows Gandalf because Gandalf was like Bilbo (Frodo's grand-uncle) guardian on Bilbo's adventures. Now, Frodo knows Gandalf through Bilbo.
Gandalf was known by different names to different peoples: Gandalf to Northern men, Mithrandir to the elves and Dunedain (as in Gondor), and Tharkun to the Dwarves. Olorin was his true name as a Maia.
The hobbits of the Shire might describe describe Gandalf as wise, powerful, and fun-filled.(Gandalf is over 3000 years old!)