system
Given the following post, respond as if you're commenting on Reddit:
human
[LOTR] Who in Middle Earth knew that the Wizards were not humans?

Did the rulers of Gondor know since they gave Saruman Isengard with the assumption Saruman is powerful enough to defend it? Which elves knew Istari were Maia? Was it common knowledge that the Wizards had lifespans too long for humans? What did Dwarves, Hobbits, and ordinary men think of what Wizards are? Is doing magic tricks enough to convince most people that Wizards aren't humans?
gpt
The only individuals in Middle Earth who explicitly knew for sure the Istari were Maiar was Cirdan, Elrond, and Galadriel. Celeborn, Glorfindel, Bombadil, Sauron, and the Balrog certainly knew as well.

The fellowship, Treebeard, and Faramir probably had the next best suspicion of their origins through close interaction.

Everyone else saw them as sorcerers who were members of Wise. Wizardry and sorcery are not unique to the Istari.