The plot could involve the tough character being pregnant and initially not wanting Goku's help. She might be used to handling things on her own. But as the pregnancy progresses and complications arise, she has to rely on Goku. Goku, in turn, has to learn about the delicacy of the situation and how to support her, all while dealing with any external threats that come their way.
Perhaps the tough character is pregnant with a special child that has some connection to Goku's world. Goku discovers this and feels a sense of responsibility. He helps the character throughout her pregnancy, from finding a safe place to stay to getting the necessary resources. Along the way, they face challenges not only from physical threats but also from the doubts and fears of the tough character herself as she prepares to become a mother.
Well, it could be about Goku Jr learning some of Goku's most powerful moves. Maybe Goku teaches him the Kamehameha. They might also go on an adventure together, like fighting a new and powerful enemy that neither could face alone.
The plot could involve Goku and Goku Black fusing accidentally. Maybe due to some strange energy anomaly. And then they have to figure out how to control this new form. They might initially be feared by their friends because of Goku Black's reputation, but then they prove that they are on the side of good by using their new powers to protect the Earth from an impending threat that no one else could handle.
Well, perhaps in this fanfiction, Goku Black makes a fatal mistake. He could underestimate Goku's ability to adapt during battle. Goku, being the experienced fighter he is, notices this weakness and uses it against Goku Black. He might use a combination of his signature moves like the Kamehameha in a new and unexpected way that catches Goku Black off - guard, leading to his defeat.
Well, the plot could involve Naruto being a huge fan of Goku through some kind of inter - dimensional viewing device. He starts to mimic Goku's training regime, much to the confusion of his friends in Konoha. Then, an evil force from the Dragon Ball universe somehow crosses over to Naruto's world. Naruto, with his new - found inspiration from Goku, decides to take on this threat, and in the process, he might even convince Goku to come and help him save his world. Along the way, there could be lots of comical moments as Naruto tries to explain ninja concepts to Goku and vice - versa.
One possible plot could be that when Goku and Goku Black fuse, they create a being with an incredibly powerful mix of Goku's pure heart and Goku Black's dark power. This new being might initially struggle with the conflicting natures within. They could then face an even greater threat than before, like a new, super - powerful villain that neither Goku nor Goku Black could have defeated alone. As the fused being, they have to learn to control their power and find a balance between good and evil within themselves to defeat this new enemy.
One possible plot could be that Kushina discovers she's pregnant and she and Minato start planning for the baby's future. They could be discussing names, and Naruto (while in the womb) could somehow communicate his preference in a very innocent and magical way. The story could also involve the other villagers bringing gifts and well - wishes for the coming baby.
Perhaps it involves a character being caught in a physical sticky situation, such as being trapped in a gooey substance that has special properties in the world of the fanfiction. They then have to figure out how to free themselves while also dealing with other challenges like approaching enemies or rescuing friends.
The plot might involve Goku finding the baby as part of some sort of mystery. For example, the baby could be a key to unlocking a hidden power or an important prophecy. Goku, being the hero he is, decides to protect the baby at all costs. He may seek help from his friends like Bulma to figure out more about the baby and its significance.
One possible plot could be that Goku and Kale are forced to team up during a universal threat. They start off not getting along due to Kale's shyness and Goku's carefree nature. But as they face challenges together, they gradually learn to understand and respect each other. For example, Goku could teach Kale some new fighting techniques, and Kale could show Goku a different way of approaching battles with her unique Saiyan powers.
One plot could involve time travel. Android 1 travels back in time and meets a younger Goku. At first, Goku is suspicious of her, but as they interact more, they start to care for each other. Android 1 tries to help Goku in his battles against the Saiyans in this timeline. Their love story unfolds as they try to change the future for the better, with their relationship being a key factor in uniting different factions in the fight against greater threats.