A possible plot could be that a powerful magical artifact causes Goku and Tsunade to swap bodies for a while. During this time, they have to learn about each other's lives and powers. As they do this, they gain a newfound respect and admiration for one another. Eventually, when they return to their original bodies, their relationship has changed, and they start to fall in love. Or maybe there is a prophecy that only the combined power of Goku and Tsunade can defeat a great evil. As they work towards fulfilling the prophecy, they grow closer and fall in love. There could also be a plot where Goku is invited to the Naruto world for a martial arts tournament, and he and Tsunade meet there. Their relationship then develops as they interact during the tournament and the events that follow.
There are likely some out there. You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Goku and Tsunade love' and you might find some interesting stories. However, since they are from different anime universes, the fanfiction might be quite creative in how it brings them together.
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.
A common plot element could be Naruto having dreams or fantasies about Tsunade that drive his actions. He might be constantly thinking about her and how to make her happy. Tsunade may be in denial about her feelings for a long time, but as she spends more time with Naruto, she can't help but be drawn to his positive energy. There could also be a plot where the village has some sort of reaction to their relationship, either positive or negative, which then affects how they handle their feelings for each other.
Maybe Kale is sent on a mission to Earth and Goku is the one who helps her adapt. They start training together and during the training sessions, they discover they have a lot in common. Their shared love for fighting and getting stronger becomes the foundation of their romantic relationship.
Maybe Goku accidentally saves a female alien during one of his adventures. She is from a race with unique powers. She becomes intrigued by Goku's strength and simplicity. As she stays around to learn more about Earth and Goku, they start to fall in love. Their relationship could be tested by the fact that she has responsibilities in her own world.
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, 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.
Well, Tsunade had a complex love life. One of her notable relationships was with Dan. Their love was pure and deep. Dan was a kind - hearted shinobi. They shared many dreams and hopes together. But unfortunately, Dan died in the war, which left Tsunade heartbroken for a long time. Later, she also had some unspoken feelings and a special connection with Jiraiya, who was her long - time friend. They had a relationship full of mutual understanding and respect in a way, but it was never fully realized in a traditional romantic sense.
Well, fanfiction is a vast world. When it comes to Orochimaru and Tsunade's love fanfiction, it often delves into the idea of redemption for Orochimaru in the context of their relationship. Writers might show Tsunade seeing a side of Orochimaru that no one else does and falling in love with that potential for good. It can be really interesting to read how they navigate their feelings given their very different personalities and pasts.