Harry is almost certainly a horcrux - repost of ideas against

[pippin_999]

No: HPFGUIDX 150499

Geoff:
> Number one. Harry apparently kills Voldemort. The last remnant of soul 
in him is  destroyed but – there is still a piece of soul in Harry. What happens? 
Does Voldemort  become disembodied again? 
<snip>
 Would that happen here and Voldemort become almost a ghost figure? 
> Presumably, as per the words of the prophecy, Harry would have 
vanquished him, but what  of the future?

Pippin:

Constant vigilance. Evil can never be entirely defeated. But it can be driven 
out. Help has always been to hand once evil has been exposed and recognized.
Only when the characters refuse to see it in their midst do they
become vulnerable.

Even if Harry is the last horcrux (and it could just be his scar) in the end
Harry would die, and the last of Voldemort's horcruxes would be
destroyed. If Voldemort is once again a disembodied entity, less than the
meanest ghost, he would remain one, but one that cannot take mortal form
again without risking mortal death. Even with Quirrell and his wand
available, Voldemort was reluctant to do that. I imagine he'd be even
more reluctant to do it if he knew that all the horcruxes were gone.

But there might still be a way to destroy Voldemort. 

 If a horcrux is hidden in the body  of a living person, and that
body passes through the veil, then IMO the soul fragment within will not
be on the earth anymore, and nothing will tie the disembodied 
Voldemort to earth. 

I can see the last ESE!character surfacing after Harry has vanquished
Voldemort, revealing himself in order to prevent Harry from
using the veil to dispose of himself and the last horcrux. Perhaps
they will struggle and fall through together, and Harry will come
out again through the locked door. Or not. Or maybe Harry will
be persuaded that a live Harry and a dead ESE is worth a disembodied
Voldemort who no longer has any followers who would bring him
to life again. I get the impression Dumbledore thought death was
too good for LV.

Whatever happens, it's been said more than once that Voldemort alone 
is not so dangerous -- it's his followers that are the real problem. 
I don't think the story will be quite over when Voldemort goes down 
for the last time.

Pippin