Ino. Since she is Sakura's friend, she can bring in some girl - talk moments. She could also be a bit jealous of Sakura's relationship with Sasuke at first, but then come to accept it and even help them out in some situations in the fanfic.
Sakura is also a great character in fanfics. Writers can develop her from a girl with a crush to a strong and independent kunoichi. They can show her medical skills and how she uses them not only to heal physically but also to heal the emotional wounds of those around her, especially Sasuke.
One great 'Sasuke Sakura Shippuden Fanfic' is 'A New Beginning'. It shows a different take on their relationship post - Shippuden. The story delves deep into how they deal with the traumas of the past and try to build a future together. The characterizations are really well - done, staying true to their original personalities from the anime.
Ino could be included. She and Sakura could have a bit of a friendly competition for Sasuke's attention at the start. But then as the story progresses, she could become one of Sakura's supporters in her relationship with Sasuke. Also, Kakashi as a teacher could play an important role, perhaps giving Sasuke and Sakura some wise advice about love and relationships.
There are many great authors out there. One popular one might be someone who really captures the essence of Sasuke's brooding nature and Sakura's growth in the Shippuden series. They write in a way that makes the characters' emotions feel real. But it's really subjective as different people like different writing styles.
Naruto is often a popular character in these fanfictions. He could be Sasuke's rival for Sakura's attention or a good friend who tries to help them get together. Ino is also a common character. She might be Sakura's friend or sometimes a rival in matters related to Sasuke. Kakashi could be their teacher who gives them advice about their relationships and schoolwork.
Well, I think Shikamaru would be an interesting character to include. He's smart and could help Naruto with any strategic decisions related to their future as a family. Hinata could also be part of it. She's always been kind - hearted, and she could be a source of emotional support for Sakura. And of course, Jiraiya. Even though he's passed away, his teachings and influence on Naruto could be shown through flashbacks, like Naruto remembering the lessons about family that Jiraiya taught him.
Temari could be a great addition. As Gaara's sister, she could play a role in either supporting or being skeptical of their relationship. Naruto could also be included. His friendship with both Gaara and Sakura could add some interesting dynamics. He might be the one to encourage them or accidentally create some comical misunderstandings. Kankuro could be another character. He could provide some insights into Gaara's past and how his relationship with Sakura might change things in the Sand Village.
A good 'Sasuke Sakura Shippuden Fanfic' should have believable character development. Since we already know Sasuke and Sakura from the anime, any changes or growth in their characters should be in line with what we know about them. For example, Sasuke's brooding nature should still be there but perhaps softened a bit in a relationship with Sakura.
Shikamaru might be included as well. He could be involved in strategic planning for the wedding security or just be there as a friend to both Sasuke and Sakura. And Tsunade, as Sakura's mentor, might be present at the wedding, giving her blessings and sharing some words of wisdom about married life.
Well, 'The Bond Beyond Time' is also a really good one. It delves deep into the emotional aspects of Sasuke and Sakura's bond during Shippuden. The author does an excellent job of showing how their feelings develop gradually while they face various challenges together.