Professor Samuel Winchester

Professor 
Sam Winchester 
Professor of Supernatural Beasts and Where to Hunt Them
The Road So Far...
(This story begins in an alternative universe where both the Supernatural and Harry Potter universes are the same world, and then continues into the Harry Potter Canon Universe. I tried to tie as many strings together as I could remember. This is a condensed version.)
 
In 1976, James Potter strikes a deal with Azazel to allow the Yellow-Eyed Demon to use his first born in exchange to be able to marry Lily. Shortly after this, Voldemort obtains this information and in his search for immortality begins searching for the source of Azazel and his powers bringing him to Lucifer. Voldemort then proceeds to try to persuade Lucifer to make him a Prince of Hell, which Lucifer denies. This infuriates Voldemort, sending him to turn to find Azazel himself to gather what he can. Azazel makes a deal with Voldemort to give him more power in exchange for keeping an eye on James and Lily.
 
By 1981, the Potters are protected by the Fidelius Charm and has been able to avoid Azazel who has become furious and possesses Voldemort to storm the Potter house upon finding out where they were finally. He casts The Curse and is able to flee before Voldemorts body disintegrates when the spell backfired. He realizes that he won't be able to deal with harry as planned as Harry was now a Horcrux.
The Men of Letters, being an offshoot of the Magical Congress of the United States starts secretly training Sam in the Wizarding ways when Sam turns 13. After two years of training, the Men of Letters go to help in the Battle of Hogwarts. After Snape dies, "Chuck" sends Snapes wand to Sam, which then "port-keys" Sam to Hogwarts (Canon universe) in the middle of the Battle of Hogwarts. 
After the confusion and the dust settled, the Hogwarts staff decided to keep Sam there away from the reaches of the Ministry. He was sorted into Ravenclaw and shortly met Runa Rosehip which blossomed into a very close friendship. Sam decided to stay at Hogwarts after finishing school to help with the influx of the newer generation of wizards coming in.
Sam sometimes has flashbacks of his former life, and of other completely different lives, but has yet to make sense of any of the visions, nor be able to piece them together. He tends to keep to the Library, always in deep study and concentration, continuously looking for a way back home.
Currently
Sam and Professor Selene Rosewood have ventured to America, where a researcher of time and space travel resides. They then are going to see if the Bunker exists in this world and see if clues exist to help Sam get home.