Well, it could be a story about their adventures together. Maybe they embark on a journey through a magical world. They could encounter various challenges and have to use their unique skills to overcome them.
One way is to create interesting characters. Besides Ivan Mariani and Hyun, introduce some side characters with unique personalities. This can add more depth and complexity to the story.
One possible plotline could be that they meet during some sort of inter - galactic event. Maybe Gohan is there to protect Earth from a threat that also involves Blackfire's planet, and they end up having to work together. Along the way, they start to develop feelings for each other.
A plotline could involve Ayane being a mysterious figure who has some unique power. Naruto is intrigued by her and tries to get to know her better. As they interact more, they find themselves falling in love. Maybe there's also a villain who wants to use Ayane's power for evil, and Naruto has to protect her.
A plotline could involve a magical artifact that has the power to change the fabric of different universes. Naruto, Mirajane, and Erza are all drawn to it for different reasons. Naruto wants to use it to protect his village, Mirajane to protect her guild, and Erza for the sake of justice. As they fight over the artifact at first, they realize that a greater evil is trying to use it for destruction, so they join forces. Along the way, they learn about each other's worlds and cultures, and their relationships grow.
One possible plotline could be that Madara, Hinata and Sasuke are forced to team up for a mission. Along the way, they start to understand each other better and develop unexpected bonds. Maybe Hinata's kind nature starts to soften Madara's hardened heart, and Sasuke is caught in the middle of this new dynamic.
One possible plotline could be that the Doctor and Jack Harkness team up to save a planet from an unknown alien threat. They use their combined knowledge and skills to outwit the aliens.
A more complex plotline could involve time - travel. Pyro's sister could travel back in time to prevent Pyro from making certain bad decisions that led him down a dark path in the X - Men universe. This would involve her interacting with different versions of the X - Men characters and changing the course of events.
One possible plotline could be that Gintoki and Tsukuyo have a daughter who inherits their unique traits. Maybe she has Gintoki's laid - back but strong - willed nature and Tsukuyo's fighting skills. And the story could revolve around her growing up in the same world as her parents, facing the various challenges and making friends and enemies along the way.
One possible plotline could be a love - at - first - sight scenario where Porky Pig is smitten with Petunia and tries to court her in his bumbling but endearing way.
One possible plotline could be them working together on a dangerous mission in the wizarding world. They gradually develop feelings for each other as they face various challenges and rely on each other's skills. Another could be that Amelia Bones discovers some long - hidden secret about Harry's past that brings them closer. Or perhaps there's a plot where they are forced to pretend to be in a relationship for some political or magical reason in the wizarding community, and then real feelings start to develop.