Gandalf The Superhero

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Speaking of Gandalf on Legate’s "power" thread I came to think of a quote I recently read in TT (as I remember it, the movie scene and dialogue were similar to the book's). The episode I'm thinking of is when Gandalf The White first appears and speaks with Aragorn and co in Fangorn.

G says:

Indeed my friends, none of you have any weapon that could hurt me

That's remarkable, isn't it? What would happen if Legolas shot straight at him? Would the arrow have clinked off him as if shot at a steel plate or just passed straight though his body? Gandalf the White is a real superhero, isn't he? I mean, Sauron, the Balrogs, even Morgoth could be hurt and "killed" bodily by physical weapons, but here Gandalf states than not even the famous Andruil, that once helped to finish off Sauron, could hurt him.

Or perhaps only 'evil' weapons could hurt Gandalf the same way as only 'blessed' weapons could hurt the Nazgul?

And could this be because he was reborn? I think I remember reading somewhere that reincarnated Elves may choose to be seen or not and pass straight through physical barriers at their discretion. But could Gandalf really do that you think?

Also, the Maiar are said to be able to shift shape or walk unclad right? Do you think Gandalf could do that ? How about Saruman? Sauron certainly could before his first disembodiment in Numenor.