After leaving under mysterious circumstances, he goes missing from his friends lives. This is when they're thirteen. Twelve years later, he reappears, but with someone by his side. When they ask who is she, he replies' Ohana means family, family means nobody gets left behind or forgotten." A little story I came up with. Has a OC, and mentions OC's. Sorry summary sucks.

When the prophecy is ready to complete, three of them have to go on a freighting journey of a quest, from killing monsters, to learning spells, finding the past, entering the Hyper and Nether Range's, oh, and trying to stop Creation from collapsing in on itself. Yup. Even better, the fourth member is a life-threatening spirit. Just a normal thing for a citizen of Gravity Falls.

It had been done. The cost had been taken. He was gone. The spunky, hyper, jokester demigod of Hephaestus was gone. But, after a few months, Nico realizes that he didn't feel Leo's soul die that day. But where could he be? They search immediately. At the Lake however, the Thunderclan Leader has taken on a mysterious apprentice. One with great power, but how great, they don't know.

(Percy Jackson, Gravity Falls, Harry Potter crossover: Takes place in the OotP) Now that Voldemort is on the loose, Harry needs all the protection he can get. The thing? The team is full of young teens, and pre-teens. But, these people are not who they seem. Harry may have a prophecy about him and Voldemort, but what if he was part of a bigger picture with the others? A lot bigger