Summary: Creature!Harry has inherited Giant blood from somewhere in the family history. It manifests itself as he is growing up in the Dursley household and the muggles think he has Gigantism (think Robert Wadlow, who at age 10 was already 6'6" and grew to be over 8 ft).
Time frame: 1st year (or more, but I want to see Diagon Alley)
Things to consider:
*Where is he sorted? I sort of see Giant!Harry as a Hufflepuff, but you don't have to. Just give me some reasoning for whatever you choose.
*Do people on the Alley mistake him as Hagrid's son?
*Beds - both at the Dursleys and Hogwarts (Do they pull out Hagrid's old bed?)
*School supplies (Robes etc. Is there a shop that Hagrid shops at separate from everyone else on Diagon Alley?)
*Do brooms even come that large?
*Does Harry keep growing? How big does he get? Probably only from one side of the family, so he'd grow like a half-giant (still big!).
Re: Snape - I'd like to see him as an ally of some sort.