Adoption

The Last Will and Testament of Lily Evans Potter (Harry Potter) by Chrmisha
Petunia Dursley is cleaning the attic and finds a previously unknown copy of Lily's will. Ecstatic at her discovery, she promptly abandons her burdensome nephew, along with Lily's will, on the doorstep of her childhood neighbour (aka, Severus Snape).
Nobody Cared (Harry Potter) by Etherian
11 yr old Harry misses the Hogwarts Express. Snape is sent to find out why. What he finds changes any preconceived notions he might have had about the Boy-Who-Lived. AU, manipulative!Dumbledore, DE's, Voldy, but no horcruxes.

Harrys First Detention

(2) Harry's New Home (Harry Potter) by Kbinnz
One lonely little boy. One snarky, grumpy git. When the safety of one was entrusted to the other, everyone knew this was not going to turn out well... Or was it? Sequel to "Harry's First Detention". AU.

(1) The Definition of Home (Harry Potter) by Oliver Snape
Harry runs into Snape while trying to find the definition of home, and finds himself drawn into Snape's summer Order task by the headmaster, looking for a location outside of London. Along the way, he and Snape learn a few new definitions themselves.
(2) The Definition of Family (Harry Potter) by Oliver Snape
Now back at Hogwarts, Harry balances school and his home life as he prepares to face Voldemort and learns to trust Snape's guidance. Along the way they both learn that family also means support.

(1) Resonance (Harry Potter) by GreenGecko
Year six and Harry needs rescuing by Dumbledore and Snape. The resulting understanding between Harry and Snape is critical to destroying Voldemort... (AU)
(2) Revolution (Harry Potter) by GreenGecko
Harry continues his Auror training and begins a journey of mastering his unusual and growing powers. Harry, with the help of his adoptive father, is finally making his own way, but fate and prophecy are never completely absent.

(1) Whelp (Harry Potter) by Jharad17
AU. Harry is 7 years old and treated literally like a dog by the Dursleys. Will he be rescued by the wizarding world? Will he ever be fit to take on the mantle of The Boy Who Lived? childfic, preHogwarts, Sevitus. warning:extreme child abuse, violence

(1) Becoming (Harry Potter) by Unexpected Inspiration
When Sirius Black escapes Azkaban and 8-year-old Harry Potter disappears, the world is thrown into upheaval. What will Britain and Harry be without each other, and who will face the Dark? You only THINK you've read this before. I guarantee you haven't.