Gandalf's friends
Aragorn was a great friend of Gandalf's, both being wise and strong, they journeyed in many places together to protect the Shire from harm.
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King Theoden of Rohan Gandalf kept in touch with off and on as he roamed from land to land. He went to Rohan after his escape from Saruman and borrowed Shadowfax from him. After a while it became clear that Shadowfax and Gandalf were bonded, and Theoden let Gandalf keep him as a gift, because Gandalf had rescued him from the wiles of Saruman and Grima Wormtongue.
Gandalf befriended Bilbo, a homebody hobbit, and set him on a "little" adventure that would change his life and perspective on everything. Gandalf was the one who made Bilbo give up the ring so that Frodo could take the burden, for lately it had been eating away at Bilbo's mind.