i have said it before, in another thread. since i read deathly hallows.....

the small dying 'being' in kings cross i believed to be a symbol of the part of voldemort which remained. at that stage, he still had his part of his sole, plus nagini. But still at 2/8's that is not a lot!
therfore resembled a dying - helpless - revolting 'alienlike being'

i also assumed the kings cross event to symbolise that of a 'limbo' stage of deathg - at that stage, harry was near death (but still his whole self) and voldemort (little did he know) was represented in the potentially 'other side' as a very limited version of a living being.

it represented for me, those people who were in fact in limbo of life versus death. i think because of dumbeldorts intelligence + the elder wand as his own, he is not ENTIRELY dead, therefore only in limbo. this applies for voldemort, only until harry awakes and neville defeats nagini, and then harry decides voldemorts eternal fate - thanks to the elder wand -
and harry - who is still able to make the choice to return to conscious thought and continue life as it remains....(in battle with voldemort)

i dont care if people find this wrong, i belive it to be a logical answer for my own suspiscions, plus rest for the peaceful charcters involved in the defear!