A good 'Charmed Chris Halliwell fanfic' has a strong plot. It should be something that keeps you hooked from the start. For example, a plot that involves Chris trying to solve a mystery related to the Charmed Ones' past can be really interesting.
In the world of 'Charmed Chris Halliwell fanfic', there are often different genres. You can find action - packed ones where Chris is in the middle of a big battle, or more emotional ones that deal with his family issues. The best fanfics usually stay true to the essence of the Charmed series while adding their own creative twists.
Well, perhaps it could involve Chris falling for a witch from another coven. They meet during a magical gathering and are instantly drawn to each other. Their love story might be filled with challenges like having to keep their relationship a secret from their respective covens at first because of some old feuds or rules.
When a Halliwell goes to war in fanfiction, there might be unexpected alliances and betrayals. Also, it could force them to confront their deepest fears and uncover hidden strengths.
For Naruto and Piper, a great character to pair them with could be Sasuke. Sasuke's brooding nature and powerful skills would add an interesting dynamic. He could also learn a thing or two from Piper's magic.
One possible storyline could be Naruto finding himself in the Charmed Ones' world and teaming up with Piper to fight demons. Naruto's ninja skills would be a great asset against the magical threats they face.
One popular storyline could be Piper dealing with the challenges of her pregnancy while still protecting the world from evil. She might have to balance her new physical limitations with her duties as a Charmed One. Another could be how her sisters react and support her during this time. Maybe they use their powers in unique ways to help Piper through the pregnancy.
One popular Piper pregnant fanfiction might be found on FanFiction.net. You could search for stories that focus on Piper's pregnancy and how it affects her powers and relationships within the Charmed universe. Another place to look is Archive of Our Own (AO3). There are often many creative takes on this scenario in the Charmed fandom there.
If Piper hurts Chris, it would surely create a rift in the family dynamics. The Halliwell sisters would be caught in the middle, having to deal with Piper's actions and also help Chris. It could also lead to a change in Piper's character arc, as she'd have to come to terms with what she's done.
Definitely her sisters, Phoebe and Paige. They are her closest family and would be there for her throughout the pregnancy. Leo, as her husband, is also crucial. He can provide support and love. Then there could be some of the recurring good witches or magical beings who could offer their help or advice. For example, Grams could appear in Piper's dreams to give her some grandmotherly wisdom about motherhood.