The Guardian {PJO&HOO/Harry Potter}

What if Percy was born in 1960 and was a Wizard? What if he wasn't the prophecy child, but played a big role in the war? What if Percy was present in the wizarding world while the first was against Voldemort? How much would change? What if when he is older he helps some of the orphaned witches, wizards, demigods, and demi-wizards? Well a lot changes around Percy in the Greek world, so why not in the Wizarding one too?
Percy finds out that the Marauders are difficult people to be friends with. But being away from the house other than to Camp is the best thing that has happened in his short life.