You / OC somehow have the power to jump dimensions (or Alternate Universe). You/OC find out that they/you can change the movies, cartoons, books, anime Universe because you/oc know what going to happen. So you/oc adopt Naruto, Sasuke, Harry potter to change the outcome their story.
You can raise Naruto, Sasuke, Harry potter in any dimension (movies, cartoons, books, anime) you want and the time of the dimension is all different (Like it been 20 years in harry potter universe but in Naruto universe it only been 20 hours, so if they change dimension they will be kids again or adult).
Harry Age: 8 Birthday: July 31
Naruto Age: 7 Birthday: Oct 10
Sasuke Age: 8 Birthday: July 23
Paring: Don't really care who they with it can be Yaoi if you want
If you want there can be characters bashing