First a reply for the
Prince (and Sulimo) : The
Dwarves were made be
Aulë, but given souls/Fëa's be
Eru Illúvatar, and thus becomming his "third children" (quote #1). The
Ents were NOT made by
Yavanna, but "
Spirits from afar" who came into
Arda and clad themselves in treeish shells/skin and "worked" as tree-shepards. (quote #2)
But Yavanna had thought of them and incorperated them into her song, at the beginning, thus they ARE in theory her creations... but she didn't make them, they made themselves and thus, can only be counted as either loose/free spirits (quote #3) or
Ainur.
The fates of the Ainur, we know... after the end of the world, they shall return to Eru and, along with the spirits of
men, commense the Second Song of the Ainur for the creation of a new world. (quote #4)
Where the free spirits come from and their fates, we don't know. (stray Ainur?)
Sulimo, here's for you :
Hobbits : Yes indeed, they were of the human
race! ...and thus share their fate. (quote #5)
The Ents : see my reply to the Prince.
Slain
Maiar : Well, what can I say? When
Tolkien didn't write about dead Maiar, all we can do, is assume and guess... Your guess is just as good as mine! There was an unnumbered amount of Maiar to help the
Valar and only a few is named and mentioned in the stories. The only known Maias to have "died" is
Gandalf,
Saruman,
Sauron and an unnumbered amount of
Balrogs. Other beings might have been Maiar as well, but that we don't know for sure. About fates of Valar and Maiar : see above under fates of the Ainurs...
Evil spirits : My guess is that they are held captive in the
Halls of
Mandos for a period, and either given mercy by Eru and send "back home" to him or thrown into the Void.
Special cases : The spirits of the Dark-Elven, those who refused the offerings of the Valar, were denied entrance into the
undying lands and simply, when dying, vansihed into "shadow-like spirits" floating around within Arda until the end of times. After that... who knows? The
elves... and Tolkien himself, didn't know of the Elven fates. (quote #4)
Edit : About Dark-elven: I'm trying to locate the proper Quote...
Ainur live forever... or just as long as Eru Illúvatar. They are made of his thoughts and thus are parts of him. But if they are clad in "living" skin or body, then that shell can get hurt, or grow old and die, but the Ainur inside still lives and can "dress" itself in another shell if wanted or needed. (My guess)
#1 said:
(Quenta Silmarillion, Of Aulë and Yavanna)
For they say that Aulë the Maker, whom they call Mahal, cares for them, and gathers them to Mandos in halls set apart; and that he declared to their Fathers of old that Ilúvatar will hallow them and give them a place among the Children in the End. Then their part shall be to serve Aulë and to aid him in the remaking of Arda after the Last Battle.
#2 said:
(Quenta Silmarillion, Of Aulë and Yavanna)
Manwë said: O Kementári, Eru hath spoken, saying: Do then any of the Valar suppose that I did not hear all the Song, even the least sound of the least voice? Behold! When the Children awake, then the thought of Yavanna will awake also, and it will summon spirits from afar, and they will go among the kelvar and the olvar, and some will dwell therein, and be held in reverence, and their just anger shall be feared.
.....
Then Yavanna was glad, and she stood up, reaching her arms towards the heavens, and she said: High shall climb the trees of Kementári, that the Eagles of the King may house therein! But Manwë rose also, and it seemed that he stood to such a height that his voice came down to Yavanna as from the paths of the winds. Nay, he said, only the trees of Aulë will be tall enough. In the mountains the Eagles shall house, and hear the voices of those who call upon us. But in the forests shall walk the Shepherds of the Trees.
#3 said:
(Book of Lost Tales #1, The Chaining of Melkor)
At that time did many strange spirits fare into the world, for there were pleasant places dark and quiet for them to dwell in..., ...Still is the world full of these in the days of light, lingering alone in shadowy hearts of primeval forests, calling secret things across a starry waste, and haunting caverns in the hills that few have found: -- but the pinewoods are yet too full of these old unelfin and inhuman spirits for the quietude of Eldar or of Men.
#4 said:
(Quenta Silmarillion, Of the Beginning of Days)Yet of old the Valar declared to the Elves in Valinor that Men shall join in the Second Music of the Ainur; whereas Ilúvatar has not revealed what he purposes for the Elves after the World's end...
#5 said:
(The Tolkien Letters,From a footnote to letter #131)
The Hobbits are, of course, really meant to be a branch of the specifically human race (not Elves or Dwarves) – hence the two kinds can dwell together (as at Bree), and are called just the Big Folk and Little Folk. They are entirely without non-human powers, but are represented as being more in touch with 'nature' (the soil and other living things, plants and animals), and abnormally, for humans, free from ambition or greed of wealth. They are made small (little more than half human stature, but dwindling as the years pass) partly to exhibit the pettiness of man, plain unimaginative parochial man – though not with either the smallness or the savageness of Swift, and mostly to show up, in creatures of very small physical power, the amazing and unexpected heroism of ordinary men 'at a pinch'.
I hope this helps... otherwise, just ask...:*up