This site has great theories. http://www.harrypotterforseekers.com/book7/fates.php#7harry
Character Fates
Harry
We believe the septology is the story of how we can defeat death once and for all, and so we see Harry as the hero who will go through the Arch with the Veil, which is traditionally called the Gate of Saturn. He will do this because he will realise that his scar, symbolising his ordinary mortal consciousness, is the last horcrux of Voldemort, and before Harry can defeat Voldemort, Harry will have to sacrifice himself first. He will go through the Gate of Saturn, and meet Sirius again. Harry will then return to the world of the living, where he will face Voldemort, who will now be mortal.
However we don't think Harry will kill Voldemort. Harry symbolises the child of God who is potentially present in the heart of every seeker, and God does not kill. We believe Harry will draw upon the Force in the Room of Love, and in that Force, Voldemort will kill himself. Good does not destroy evil; evil destroys itself in the presence of divine love.
We also believe Harry will enter the Room of Love and find something to do with his mother Lily there. In that room Harry's heart will be so filled with compassion for suffering humanity that he will want to stay behind as Keeper of the Keys, or Gatekeeper, to show seekers for liberation the Gate to the Magical World, as Hagrid did to Harry in the beginning. This will allow Hagrid finally to leave this world and resume his magical journey to eternal life.
See newsgroup post 1543
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Sirius
[Sirius]
When the Original Spirit created humanity millions of years ago, each human being was connected to a divine plan for the eternal and perfect development of the individual. This plan is personified by Sirius. After the Fall, this plan became dormant, but could not die, as it is eternal and indestructible.
Whenever an earthly human begins to long for the return to the Original Spirit, the Lily in his heart opens, and a new soul is born. This is Harry. At the same time the original divine plan begins to reactivate: Sirius becomes Harry's God-Father, mentor and guide. Sirius has preceded Harry through the Gate of Saturn. In book 7 Harry will follow Sirius through the same gate and meet him there. We believe this meeting is symbolised in the New Testament in the Book of Revelation, Chapter 1. John sees the figure of the perfect and eternal human being that he himself is to become. Harry will see Sirius in his real appearance: in indescribable magnificence, glory and radiance. Harry will no doubt have to return to earth to defeat Voldemort, but Sirius will give Harry great help in some way.
We also believe that after Voldemort's defeat Sirius will send the Holy Spirit to Harry so that he can attain eternal life. Although Harry will probably take on Hagrid's job after he dies, we believe Sirius and Harry will be united and Sirius will always be close to Harry to shine upon him as a loving spiritual sun.
See newsgroup post 1590
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Neville Longbottom
[Neville]
The human body is a temple created by God. However the earthly body we have now is a ruin compared to the indestructible and incorruptible body of the original human race before the Fall. Harry Potter is a symbolic instruction manual on how we can return to our former glory. The way to do this is to apply an alchemical process which radically changes our whole being from the lead of earthly nature to the Gold of the Divine Spirit.
One of the most important organs in the body is the medulla oblongata. It controls breathing and the heart beat, among other things. But its most important function is to act as gate keeper to foreign forces wanting to enter the body. It is personified by Neville Longbottom. If you write his name and the organ underneath each other you'll see the similarity.
Neville Longbottom
Medulla Oblongata
When an alchemist has completed the process of purification and transmutation, he is ready to receive the Divine Spirit. God is ready to live in the human temple again. It is the medulla oblongata that forms the gate through which the Divine Spirit Enters. Hence in Book 7 Neville will perform a magical act of essential importance to Harry. This act will symbolise the entry of the Divine Spirit into the medulla oblongata as the gate to the spinal column, the nervous system and the pineal gland, where the Spirit will take up residence. We believe this Spirit will be symbolised either by Dumbledore or Fawkes.
Through the books we have seen Neville get more and more confident and able to perform magic. His finest hour will come in Book 7 when he will become a Master-Wizard and enable Harry to achieve victory!
See newsgroup post 1567
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Voldemort
Every human being is surrounded by a force field. This field reflects all his inner qualities, as well as his health and his past and future. When the human being dies, this force field remains, and eventually finds a baby in a family with which it has affinity. It "adopts" the baby as its own and pours into it all its energy. The force field is therefore immortal. It also has consciousness and intelligence.
In the centre of the force field there is a latent nucleus left over from the time when the human being lived in great majesty in another, perfect universe, and in the Love of the Original Spirit, where it was not susceptible to death and decay.
[Voldemort] Harry Potter is essentially the story of the original divine human being coming back to life out of the latent nucleus and replacing the present force field with a new one that surrounds him with a brilliant light like a golden sun, and turns him into an everlasting, perfect and compassionate child of the Original Spirit. The process of the new human being coming to life is called alchemy, and Jo has componentised every aspect of this tremendous and exhilarating process of turning the lead of the earthly person into the gold of the heir of GODric Gryffin d'OR.
In Harry Potter the conscious force field is called Voldemort and the new human being is called Harry , son of the Potter of the universe. The potential new force field that is to replace the old one is called Sirius. Every character in the septology is an aspect or a component of the process of alchemy.
When the soul of the new human being is first born in the heart of the mortal one, the nucleus begins to radiate a dazzling, supernal light into the force field. This means that the darkness in the centre of the old force field is driven to its outer boundaries. This is symbolised as Voldemort being driven out of his body and going to Albania.
During many years the alchemist has to struggle against the old force field continually tyring to reassert itself and to kill the new soul, which will kill the old force field if it doesn't take action. The alchemist discovers that his personal Voldemort has hidden himself in many places in his body, his soul and his consciousness. These are symbolised by the Horcruxes. Harry Potter describes, in a graphic and exciting way, the intense struggle of the alchemist to surrender his whole being to the new, immortal soul, which is growing in goodness and grace, and will finally annihilate the old force field to replace it with the Inner God. One by one the Horcruxes are destroyed, and Voldemort's grip is becoming weaker and weaker, although he doesn't realise this until it's too late. There comes a final struggle, in which Voldemort mobilises all his troops and all his magical power to destroy the new soul once and for all. But once again Voldemort faces a force that is invincible and omnipotent: Love. The divine nucleus of the force field opens up and emits a force in which Voldemort cannot survive. This is the symbolism of the Room of Love. Harry will open this room and in its power he will become absolutely invincible. Voldemort will fade away as the night fades into dawn. Harry bathes in the sunlight of Sirius; the old human being has gone and a new Child of the Potter has arisen, to work on the liberation of all of humanity, and on the perfection of the divine universe.
See newsgroup post 1555
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Hagrid
[Hagrid] Hagrid symbolises the human being on the path of Liberation who has so much love for humanity that he is willing to delay his own liberation and stay behind to help others find it. Such a human being is called a Bodhisattva, or Master of Compassion. He is also known as a gatekeeper because he can help seekers find the Gate to Eternity. Hagrid showed Harry the gate to Diagon Alley and gave him the ticket to platform 9¾.
The hippogriff which Hagrid owns symbolises the "Body of Christ", a force-field of divine energy that can give seekers the Power to become Children of God again. This is why Harry is able to fly Buckbeak after bowing in humility. Buckbeak lifts Harry up from the earth into the heavens.
Hagrid's "brother" is Grawp, symbolising humanity, which Hagrid wants to "teach things".
In The Alchemical Wedding of Christian Rosycross the role of gatekeeper is given to people who have seen Venus "naked", i.e. they have opened the Room of Love in their own hearts, exposing them to the pure Love of God Himself. We know that Hagrid was punished for loving a monster. The divine law states that a gatekeeper must keep his position until someone takes his place by committing the same deed. This makes it fairly clear that Hagrid will be replaced by Harry, because Jo has introduced the Room of Love in Book 5. Because of the similarities of Harry to Christian Rosycross it is inevitable that Harry will open the Room of Love and possibly find something of his mother Lily there. This symbolises the idea that Harry's heart will be filled with so much compassion that he will be willing to sacrifice his own liberation, and thus take Hagrid's place as a gatekeeper or Bodhisattva.
We predict that Hagrid will depart from this world in Book 7 because of the pattern of deaths in Book 5 and 6. In the Nigredo phase of alchemy Black died, in the Albedo phase Albus died, and so it is fairly clear that in the Rubedo phase Rubeus will die. However on the Path of Liberation death is just like throwing off an old cloak that has become too worn out for further use. Perhaps Hagrid will leave earth on the back of Buckbeak, who will take him up to the sublime heights of liberation.
See newsgroup post 1789
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Lupin
[Lupin] Lupin is the antithesis of Snape. He is as good as good can be in this world of relative values; of grey and black. This is why in The Alchemical Wedding goodness is symbolised by the grey king.
The goal of the alchemist is to return to God and become perfect. To achieve that, both the voices of good and of evil have to be sacrificed. Our human, relative goodness has to be replaced with the perfect Good of the Divine Plan. To gain an understanding of what will happen to Lupin in Part 7 of the septology we should have a look at The Alchemical Wedding. There both the black king and the grey king voluntarily sacrifice themselves in a decapitation ceremony. We expect that Lupin as well as Snape will sacrifice himself to help Harry in his battle against Voldemort.
In The Alchemical Wedding both kings have a queen who also sacrifices herself. The grey king has a young, vivacious wife, symbolising the rejuvenation goodness receives in the rebirth of the original divine human being. This is obviously the equivalent of Tonks, who is much younger than Lupin.
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Snape
[Snape] Every human being knows the two voices that are always giving him opposite advice: the voices of good and of evil. These are personified in Harry Potter by Lupin and Snape respectively. In The Alchemical Wedding they are personified by the grey king and the black king.
Harry often suffers at the hands of Snape because the growth of the New, Divine Soul in the alchemist is hindered by his evil past which still tries to give instructions.
The goal of the alchemist is to return to God and become perfect. To achieve that, both the voices of good and evil have to be sacrificed. To gain an understanding of what will happen to Snape in Part 7 of the septology we should have a look at The Alchemical Wedding. There both the black king and the grey king voluntarily sacrifice themselves in a decapitation ceremony in the presence of a skull with a snake in its jaws, just like the Dark Mark. We expect that Snape as well as Lupin will sacrifice themselves to help Harry in his battle against Voldemort.
In The Alchemical Wedding both kings have a queen who also sacrifices herself. The black king has a very old, frail wife. Is Snape secretly married? Or will he marry someone in Part 7?
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Fleur
[Fleur] We believe the Weasley Family symbolises the chakras and their connected endocrine glands. We see Bill as the crown chakra, linked to the pineal gland.
When the alchemist has completed the process of transmutation, consisting of the Nigredo and Albedo Phases, he is ready to celebrate the Alchemical Wedding, during the Rubedo Phase. This is the eternal wedding of the personality, the Soul and the Divine Spirit. It takes place in the pineal gland. As a result, the crown chakra, situated on top of the head, flowers open, as it were. In the ordinary person this chakra is small and has an indentation in the middle, but when the Wedding takes place, the chakra increases in size so that it covers the whole top of the head. It turns from a depression in the etheric body to a prominence, with the central indentation convexing upwards like a radiant flower on top of the crown. We believe it is Fleur who symbolises this flower.
This means that Bill and Fleur's wedding will play a vital role in Book 7. It will be a pivotal event in the book. Their wedding should be a true fairy tale one, with both of them living happily ever after.
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Draco, Crabbe & Goyle
[Crabe and Goyle] Running left and right of the spinal cord are two strings of the sympathetic nervous system. These are personified by Crabbe & Goyle. During the process of alchemical transmutation, the soul-fire, personified by Harry, slowly descends along the right string, down to the sacral plexus, and then ascends back up along the left string. During this process the New Soul purifies the autonomic nervous system, laying the basis for a new serpent-fire, while the old serpent-fire, personified by Draco, controls the body through the central nervous system. The serpent-fire is a fiery force that lives in the spinal cord and is the human "tree of life", the core of the soul. It is the basis of the consciousness which controls the human personality.
What Part 7 will show us is the final stages of the process in which the New Soul first takes over the two sympathetic nervous strings, and then finally enters the central nervous system, which means the total victory of the original divine child of God over the earthly, biological personality. This causes the birth of a new serpent-fire and a new consciousness with which the new human being can see God.
Somehow Part 7 will symbolise this whole process showing Harry replacing Draco, Crabbe and Goyle. First Crabbe & Goyle will have to submit to Harry, perhaps helping him, and then Draco will have to follow. He will either join Harry's side against Voldemort, or otherwise he will die, enabling Harry to take his place. The plot is JK Rowlings'; the process which the plot symbolises is according to spiritual laws and so can be known in advance.