Ainur in Middle-earth

Ainur in Middle-earth
The Ainur (singular: Ainu) are the immortal spirits existing before the Creation in J. R. R. Tolkien's fictional universe. These were the first beings made of the thought of Eru Ilúvatar. They were able to sing such beautiful music that the world was created from it.
History
Origins
Before the Creation, Eru Ilúvatar made the Ainur or "holy ones". The Universe was created through the "Music of the Ainur" or Ainulindalë, music sung by the Ainur in response to themes introduced by Eru. This universe, the song endowed with existence by Eru, was called Eä in Quenya. The Earth was called Arda. Those of the Ainur who felt concern for the Creation entered it, and became the Valar and the Maiar, the guardians of Creation.
Valar
The Valar included both good and evil characters. The Vala Melkor claimed the Earth for himself. His brother, Manwë, and several other Valar decided to confront him. Melkor fell into evil and became known as Morgoth, the dark enemy. The conflict between the Valar and Morgoth marred much of the world. According to The Silmarillion, the Valar and Maiar – with the aid of the Vala Tulkas, who entered the Creation last—succeeded in exiling Morgoth into the Void, though his maleficent influence remained ingrained in the fabric of the world.
Maiar
Like the Valar, the Maiar included both good and evil characters. Among the good were the Istari or Wizards, sent to Middle-earth. Among the evil were the Balrogs or fire-demons, who were some of the Dark Lord Morgoth's most powerful servants, and Sauron, the Dark Lord of the Third Age, a Maia who had been corrupted by Morgoth.
Analysis
Norse Æsir
Critics such as John Garth have noted that the Valar resemble the Æsir, the gods of Asgard. Thor, for example, physically the strongest of the gods, can be seen both in Oromë, who fights the monsters of Melkor, and in Tulkas, the strongest of the Valar. Manwë, the head of the Valar, has some similarities to Odin, the "Allfather", while the wizard Gandalf, one of the Maiar, resembles Odin the wanderer.
Christian angels
The theologian Ralph C. Wood describes the Valar and Maiar as being what Christians "would call angels", intermediaries between the creator, named as Eru Ilúvatar in the Silmarillion, and the created cosmos. Like angels, they have free will and can therefore rebel against him.
Matthew Dickerson, writing in the J.R.R. Tolkien Encyclopedia, calls the Valar the "Powers of Middle-earth", noting that they are not incarnated, and quoting Tolkien scholar Verlyn Flieger's description of their original role as "to shape and light the world". Dickerson writes that while Tolkien presents the Valar like pagan gods, he imagined them more like angels, and notes that scholars have compared the devotion of Tolkien's Elves to Varda/Elbereth as resembling the Roman Catholic veneration of Mary the mother of Jesus. Dickerson states that the key point is that the Valar were "not to be worshipped". He argues that as a result, the Valar's knowledge and power had to be limited, and they could make mistakes and moral errors. Their bringing of the Elves to Valinor meant that the Elves were "gathered at their knee", a moral error as it suggested something close to worship.
Between pagan and Christian
The Tolkien scholar Marjorie Burns notes that Tolkien wrote that to be acceptable to modern readers, mythology had to be brought up to "our grade of assessment". In her view, between his early The Book of Lost Tales and the published book The Silmarillion, the Valar had greatly changed, "civilized and modernized", and this had made the Valar "slowly and slightly" more Christian. For example, the Valar now had "spouses" rather than "wives", and their unions were spiritual, not physical. All the same, she writes, readers still perceive the Valar "as a pantheon", serving as gods.
Judith Kollmann wrote in Mythlore that "the Valar are clearly the gods of Scandinavia, Greece, and Rome, and, as well, the angels and archangels of Judeo-Christianity."
Maiar compared to Valar
Grant C. Sterling, writing in Mythlore, states that the Maiar resemble the Valar in being unable to die, but differ in being able to choose to incarnate fully in forms such as men's bodies. This means that, like Gandalf and the Balrogs, they can be killed. He notes that Sauron's inability ever to take bodily form again after his defeat could be the result of having given his power to the One Ring, but that the fate of killed Maiar remains unclear. Jonathan Evans, writing in The J. R. R. Tolkien Encyclopedia, calls the Maiar semidivine spirits, and notes that each one is linked with one of the Valar. He states that they have "perpetual importance in the cosmic order", noting the statement in the Silmarillion that their joy "is as an air that they breathe in all their days, whose thought flows in a tide untroubled from the heights to the deeps." Evans notes, too, that Arien and Tilion are central in Tolkien's myth of the Sun and Moon.
Luck or providence
The Tolkien scholar Tom Shippey discusses the connection between the Valar and "luck" on Middle-earth, writing that as in real life "People ... do in sober reality recognise a strongly patterning force in the world around them", but that while this may be due to "Providence or the Valar", the force "does not affect free will and cannot be distinguished from the ordinary operations of nature", nor reduce the necessity of "heroic endeavour". He notes that this exactly matches the Old English view of luck and personal courage, as in Beowulfs "Wyrd often spares the man who isn't doomed, as long as his courage holds." The Tolkien critic Paul H. Kocher similarly discusses the role of providence, in the form of the intentions of the Valar or of the creator Eru Ilúvatar, in Bilbo's finding of the One Ring and Frodo's bearing of it; as Gandalf says, they were "meant" to have it, though it remained their choice to co-operate with this purpose.
In culture
In astronomy, the Kuiper belt object 385446 Manwë is named for the king of the Valar.
References
Primary
Secondary
Sources
Middle-earth deities and spirits
Fictional angels
The Silmarillion