A really interesting plot could be that the female Kyuubi is actually a reincarnation of an important character from FF7. Gaara, with his unique powers, senses this connection and along with female Shikaku, they try to help the female Kyuubi unlock her past memories. This could lead to a lot of character development for the female Kyuubi as she discovers her true identity and how it relates to both the Naruto and FF7 universes. It would also involve a lot of interactions between the different characters from both fandoms, creating a rich and complex story.
One plot idea could be that the female Kyuubi has some kind of connection to the world of FF7. Maybe she holds the key to a powerful materia that both the Naruto world and FF7 world are after. Gaara and female Shikaku could be involved in protecting her as she tries to figure out how to use or hide this power. This would bring in elements of both Naruto's ninja battles and FF7's materia - based magic system.
You can try some popular fanfiction websites like Fanfiction.net or Archive of Our Own. On these platforms, you can search for the specific tags such as 'Naruto', 'FF7', 'female Kyuubi', 'Gaara' and 'female Shikaku'. There are usually a lot of fan - created stories that combine different elements from these fandoms.
One plot idea could be a crossover where the female Kyuubi and female Shukaku are somehow transported to the FF7 world. They could team up with the FF7 characters to fight a common enemy, perhaps a new threat created by a combination of Naruto -verse and FF7 -verse magic or technology.
A simple fanfiction could be that the female Kyuubi and female Shukaku start to communicate telepathically across different worlds. They realize they have more in common than they thought and decide to help each other. The female Kyuubi could offer some of her power to help the female Shukaku control her more chaotic tendencies, which in turn benefits Gaara.
One plot idea could be that Female Gaara, being the Kazekage, forms an alliance with Konoha led by Naruto. They start off as cautious allies but gradually develop a deep friendship as they face common threats. Their different leadership styles - Gaara's more reserved and Naruto's more exuberant - could create interesting dynamics.
Perhaps a plot where the female Kyuubi has to take on a human form to protect Naruto from a new, powerful enemy. In the process, they develop feelings for each other while fighting side by side.
Well, you could write a fanfiction where Shikaku has to deal with a new threat that the regular ninja forces are not prepared for. He could use his intelligence to outwit the enemy. Or perhaps a story about Shikaku mentoring a young and inexperienced ninja, sharing his wisdom and knowledge.
Perhaps in the fanfiction, the female Naruto character has a unique ability that Gaara is intrigued by. They start training together, and during these training sessions, they learn more about each other's personalities. Gaara, who has always been a bit of an outcast, starts to open up to her warmth and determination. Their relationship then blossoms as they face various challenges together in the ninja world.
In a fanfiction, a great plot could be that Female Gaara, who has always admired Naruto's strength and positive attitude, secretly helps him during a difficult battle. Naruto then starts to notice her and they begin to form a bond. As they spend more time together, their relationship blossoms. Another plot might be that Female Gaara is cursed and Naruto is the only one who can break the curse. During the process of trying to break the curse, they fall in love. Additionally, we could have a story where Female Gaara disguises herself as a boy to get closer to Naruto at first, but eventually reveals her true self and her love for him.
One idea could be that Naruto and Female Gaara meet during a mission outside of their respective villages. They start off as rivals but gradually realize they have a lot in common. For example, they both have a strong will to protect their loved ones. As they work together, they develop feelings for each other.
Another plot could be set in a post - war scenario. Naruto is trying to rebuild the ninja world, and Female Gaara is helping in her own way. They start to develop feelings as they work side by side to bring peace and stability. They could also face opposition from some who don't approve of their relationship, adding drama to the story.