Aliens?

[Raynor]

Tulkas may be one such "alien", at least in the beginning.In the Annals of Aman, it is stated in the 1500 VY:

It came to pass that hearing afar of the war in Arda Tulkas the Strong came thither out of distant regions of Ea to the aid of Manwe.

This is consistent with the Silmarillion:

Originally Posted by Of the Valar, Valaquenta

He came last to Arda, to aid the Valar in the first battles with Melkor

Originally Posted by Of the beginning of days

But in the midst of the war a spirit of great strength and hardihood came to the aid of the Valar, hearing in the far heaven that there was battle in the Little Kingdom; and Arda was filled with the sound of his laughter.