A great plot could be that Alex discovers a long - lost spell book that contains spells that are considered forbidden in the wizard world. As she starts to explore the spells, she attracts the attention of an old and powerful wizard who wants to get his hands on the book. Alex then has to protect the book and herself while also deciding if she should use the powerful and dangerous spells.
Family is a major theme. The Russo family's relationships, their support for one another, and the typical family dynamics are often explored. Another theme is magic, of course, as the family are wizards. And coming - of - age is also there, as the kids grow up and learn to handle their magical abilities and face normal life challenges at the same time.
The 'Wizard of Waverly Place' is a family - friendly show mainly aimed at a younger audience. There is no inappropriate content like the topic you initially presented. It focuses on magic, family, and coming - of - age stories in a positive and clean way.
One idea could be an OC who is a long - lost relative of the Russo family. They come to town with a special power that the Russos don't have, like the ability to control time. This could create all sorts of interesting situations, such as going back in time to prevent a major disaster that was going to happen to the family in the future.
The plot is crucial. A 'best' fanfic might have an engaging and unique storyline that still fits within the world of Wizards of Waverly Place. It could be a new adventure that Justin and Alex go on together, or a situation where they have to overcome a big challenge. Maybe it's a time - travel plot or a story about them dealing with a powerful magical creature. The plot should keep you hooked from start to finish.
Justin could be involved. He might be the one who either tries to help Alex get out of the forced lemon situation or, on the contrary, he could be the one who thinks she should just follow the rules. Another character could be Harper. She might be there to provide some comic relief while Alex is dealing with the lemon thing. For example, she could make jokes about Alex smelling like lemons all the time.
You can start by looking on fanfiction platforms like FanFiction.net or Archive of Our Own. These sites have a large collection of fanfics related to various shows, including Wizards of Waverly Place. Just search for 'Justin Alex Wizards of Waverly Place' and you'll likely find some great ones.
A magical detective who is investigating some strange magical occurrences in the neighborhood that Alex gets involved in. This character could be really serious and by - the - book, which would contrast with Alex's more carefree nature.
First, decide on their backstory. For example, if your OC grew up in a different magical community, that would shape their beliefs and powers. If they were raised in a strict magical family, they might be more reserved with their magic compared to the Russo family.
Another storyline might be a time - travel one. They accidentally travel back in time and have to blend in with the past while also trying not to change history too much. During this, their feelings for each other start to change from just sibling - like to something more romantic.