Well, a plot idea could be that Takami Sekirei gets lost in Naruto's world. Naruto, being the kind - hearted hero he is, decides to help her find her way back. Along the way, they encounter various Naruto characters who are both intrigued and suspicious of Sekirei. This leads to a series of adventures where they have to prove Sekirei's good intentions.
One interesting plot idea could be a crossover where Naruto characters gain the abilities of Sekirei. For example, Naruto learning how to use Sekirei's unique powers in his battles, which would add a whole new dimension to his combat style.
A possible plot is that there's a new threat that combines the dark forces from Naruto, like the Akatsuki, and the antagonists in Sekirei. Naruto and Miya Sekirei have to put aside their differences and work together. Maybe they start by sharing their respective combat techniques. Naruto could teach the Sekirei about chakra control, while the Sekirei could show Naruto some of their unique powers that could be useful in combat against this new threat.
One idea could be that Naruto, with his skills and determination, finds himself in the Sekirei world. He could form bonds with different Sekirei, like how he did with his friends in the Naruto world. Maybe he helps them in their battles and in the process, they all develop feelings for him.
Naruto's chakra - based powers like the Rasengan could be combined with Takami Sekirei's speed and agility. For example, Naruto could create a Rasengan and Sekirei could use her speed to quickly direct it towards the enemy, making it more difficult for the foe to dodge.
A possible plot could be that a group of evil forces in the Sekirei world sense Naruto's god - like presence and try to either capture or kill him. Naruto, being Naruto, decides to protect the Sekirei instead. He teams up with some of the strongest Sekirei and they form an alliance. As they fight together, Naruto starts to teach the Sekirei about friendship and loyalty, values that are important in his ninja world. This not only changes the Sekirei's perspective on life but also makes them stronger as a group. And along the way, Naruto might even fall in love with a Sekirei, which would add a romantic sub - plot to the story.
One idea could be an OC with a unique power that attracts different Sekirei. For example, an OC who can communicate with animals and uses this ability to bond with nature -loving Sekirei. Another could be an OC from a different dimension who has to adapt to the Sekirei world while building a harem.
A possible plot could be that Ichigo is transported to the Sekirei world during a battle with a powerful Hollow. There, he meets a Sekirei who has the ability to sense spiritual energy like he does. They form an alliance to stop a common enemy that is threatening both the Sekirei and the humans in that world. This enemy could be a rogue group of Sekirei who want to take over the world by any means necessary. Ichigo's unique powers and his experience in fighting powerful foes would be crucial in this scenario.
One idea could be a crossover where characters from Naruto and Sekirei meet in a unique situation. For example, Hinabi could find herself in the Sekirei world and have to adapt to its rules while also using her ninja skills. Another idea is a story that focuses on Hinabi's training in a Sekirei - like setting, with new challenges and opponents that test her limits. Maybe she could form an unexpected alliance with a Sekirei character.
A Sekirei and One Piece crossover would be cool too. Picture the Sekirei on the Grand Line. Their unique abilities would be a great addition to the already diverse world of pirates. They could join pirate crews as new members or cause chaos as they search for their Ashikabi among the pirates.
A plot could revolve around Delsin's discovery of the Sekirei world. He might initially be confused but then form an alliance with a particular Sekirei. Their relationship could grow as they face common enemies within the Sekirei universe, like other Ashikabi who have more malicious intents in the Sekirei Plan.