In a 'Naruto in Date A Live' fanfiction, Naruto could be a key figure in preventing a total war between the Spirits and humans. His ability to understand and empathize with outcasts (like he did with Gaara) could help him communicate with the Spirits on a deeper level. He could teach Shido some of his ninja techniques to better protect the Spirits and also use his own chakra to help stabilize the space - quakes caused by the Spirits, thus bringing a new hope for peace in the Date A Live world.
One possible plot could be that Naruto and his friends are somehow transported to the world of Date A Live. Naruto, with his determination and never - give - up attitude, could team up with Shido to fight against the Spirits that are causing chaos. Maybe Naruto's jutsu can be used in unique ways to deal with the Spirit - related problems, like using his Shadow Clone Jutsu to distract the Spirits while Shido tries to seal them.
The power combinations are also really fascinating. When Naruto's chakra - based powers are combined with the Spirits' abilities in Date A Live, it can lead to some really unique and powerful new abilities. For example, if Naruto were to combine his Sage Mode with a Spirit's power, it could create a whole new level of combat ability. This allows for some very creative fight scenes in the fanfiction.
A plot idea could be that a powerful Spirit in Date A Live is somehow transported to the Naruto world. This Spirit's power causes chaos, and Naruto and his friends have to figure out how to send it back. Along the way, they discover that the Spirit has a tragic past similar to some of the characters in Naruto. This leads to an unexpected bond between them.
One interesting plot point could be how they handle family reactions. Shido's family might be a bit surprised at first but then very supportive. However, the spirits might have different reactions. Some could be happy for Tohka, while others might be jealous or worried about the implications for the spirit - human relationship. Another plot point could be their honeymoon. Where would they go? Maybe they would go to a spirit - realm - like place that Tohka wants to show Shido, which could lead to new adventures.
One possible plot could be that the Date A Live characters somehow end up in the Harry Potter universe. Maybe they are there to stop a new kind of threat that combines the magic from the Potter world and the spirits' powers from Date A Live. The wizards are initially suspicious of them but then realize they need to work together.
The plot might involve a threat that requires both the Naruto universe and the Date A Live universe to work together. For example, a powerful enemy that is immune to normal attacks in both worlds. So, the characters from both would have to combine their unique abilities. Shido from Date A Live could use his power to calm spirits while Naruto uses his shadow clones to create diversions. It would be a story full of action, adventure, and some really cool power combinations.
In a Naruto x Date A Live fanfiction, a great crossover would be in terms of combat strategies. The Date A Live characters are used to dealing with spirits in their own ways, but Naruto characters bring in a whole new level of combat knowledge. The Date A Live crew could learn about teamwork from Naruto's team formations. Also, the different elemental jutsus from Naruto could be incorporated into the Date A Live world, like using fire jutsu to fight against a particularly powerful spirit.
One idea could be that the protagonist travels back in time to prevent a certain spirit from becoming a threat in the first place. Maybe they change a key event in the spirit's past that alters their future path.
One idea could be exploring an alternate universe where the Spirits and the main character have different initial meetings. For example, instead of meeting in a battle - like situation, they meet in a peaceful school event. Another plot could involve a Spirit who has lost her powers and the main character has to help her regain them without using the usual methods. It could lead to a whole new adventure and deeper understanding between them.
There's also 'Date A Live: Ninja Invasion'. This fanfic has a really cool concept where the ninjas from Naruto start to show up in the Date A Live world, causing chaos and also creating some unexpected alliances. It's full of action and some really fun character interactions.