Inuzuka Hana should be in the fanfiction. As Tsume's daughter, she would play a crucial role in the family dynamics. She might have mixed feelings about Naruto becoming her step - father. Also, Jiraiya would be an interesting character to include. His wild and carefree nature could contrast with Tsume's more serious and stoic personality. He could give Naruto some rather unorthodox advice about marriage, which could lead to some comical situations. And Gaara could be added too. His friendship with Naruto could be shown in the context of Naruto's new married life, perhaps with Gaara coming to visit Konoha and interacting with Tsume.
Caroline would be a great character to include. As Elena's best friend, she can offer advice and support to Elena in her married life with Damon. Also, Stefan could be in the story. His relationship with Damon adds depth and complexity. He might be initially hesitant about their marriage but eventually come around to support them.
Stefan could also be a character in it. He has a history with both Klaus and Caroline. His moral compass might clash with Klaus' actions at times, which could lead to some interesting conflicts. And his relationship with Caroline as a former love interest could add an extra layer of drama to the married life of Klaus and Caroline.
Ray, the firefly, could be an important character. He could be like their little guardian angel, lighting up their path during difficult times. Dr. Facilier's minions could also be included in a way that they try to cause trouble for Tiana and Naveen after their marriage, adding some conflict to the story. And of course, Tiana's father, whose memory could be a guiding force for Tiana in her new married life.
Definitely their friends from Ponyville. Pinkie Pie could be included to add some fun and parties to their married life. She could throw surprise anniversary parties or help them celebrate special occasions. Rainbow Dash could be there to add some action and adventure. Maybe she could join them on their quests or help protect their home when they are away.
Their married dynamic would be exciting. Naruto's energy would mesh well with Tsume's intensity. They'd be a power couple in the ninja world. Naruto could make Tsume laugh with his goofy antics, which would soften her tough exterior.
For a more unique take, including Jiraiya could be great. His pervy but knowledgeable personality could lead to some humorous and yet useful moments. He might have some ancient knowledge about the connection between the Naruto world and the Pokémon world where Darkrai comes from. On the Pokémon side, Cynthia could be a great addition. As one of the strongest Pokémon trainers, she could offer a different perspective on Darkrai and also help in battles against any enemies that might be using Darkrai's power for evil.
Haku should definitely be included. Since Haku was Zabuza's loyal follower, his presence can add depth to the story. He could act as a mediator between Naruto and Zabuza at times. Also, Kakashi can be a great addition. His history with Zabuza makes for an interesting dynamic, and his mentoring of Naruto can play a role in how Naruto interacts with Zabuza.
Well, in addition to Naruto and Urahara, Ichigo from Bleach could be a great addition. Since Urahara has a connection with Ichigo, and Naruto's energetic and positive nature could create an interesting dynamic with Ichigo's more brooding personality.
Kakashi could be a good character to put in. His experience and wide range of ninjutsu could be useful in the story. For Thalia's side, Luke could be included. His conflicted nature and his skills would add a layer of intrigue, especially when interacting with Naruto and Thalia, as they try to figure out whether to trust him or not.
Definitely Naruto himself. His determination and positive attitude can bring a lot to the story. Lala too, of course, with her fun - loving and inventive nature. Sakura could also be a great addition. She could interact with Lala in interesting ways, perhaps learning about Lala's technology and applying some of her medical skills to help Lala if she gets injured.