An ancient entity that was sealed away long ago and is now awakened by Goku's new godlike power. This entity might be a primordial force of chaos, with the ability to corrupt all things around it. Goku would have to find a way to defeat it without being consumed by its chaotic influence.
A being from a parallel Dragon Ball universe where the power levels are exponentially higher. This enemy would have a completely different set of techniques and abilities. For example, they could control the very concept of energy, not just ki, which would force Goku to adapt his fighting style in ways he's never had to before.
Another popular character is Beerus. Since he is a powerful god in the Dragon Ball universe, when paired with Godlike Goku, it can lead to some really interesting power dynamics. They could have battles that shake the very fabric of the universe or team up to deal with an emerging evil that threatens the balance of all the realms.
One epic scenario could be Goku achieving a new form even more powerful than Ultra Instinct. He might use this form to battle an ancient and extremely powerful evil that threatens the entire multiverse. This new form could have unique abilities like the power to manipulate time and space at will, allowing him to outmaneuver his opponents.
One common theme is the exploration of Goku's new limits. As he becomes godlike, the stories tend to show how he pushes the boundaries of his power. For example, he might be able to access different dimensions or have control over cosmic forces. Also, the theme of Goku's role in the universe often comes up. Is he a protector? A conqueror? These are questions that fanfictions often explore. In addition, the relationships with his family and friends can change. Some fanfictions show how his new power level affects his relationship with Chi - Chi, for instance. He might be more distant as he is on a different power plane, or he could use his power to better protect his family in ways he couldn't before.
One interesting fanfiction could be where Godlike Goku travels to different universes to teach other Saiyans how to achieve his level of power. He could encounter unique challenges and foes in each universe, making for an exciting adventure.
One popular 'Dragon Ball Z Godlike Goku fanfiction' is 'The Godlike Saiyan'. It explores Goku reaching new levels of power and facing foes that even the Z - fighters never imagined. Another great one is 'Godlike Ascension of Goku' which delves into Goku's journey as he becomes a truly god - like being with powers that transcend the known universe.
In some dark godlike Goku fanfictions, the story might explore how the other characters react to this new version of Goku. His friends like Vegeta and Piccolo would likely be shocked and conflicted. Vegeta, who has always had a competitive relationship with Goku, might see this as a new level of power he needs to reach or oppose. Piccolo, being more level - headed, might try to figure out a way to bring Goku back to his old self.
One of the interesting power - ups could be his Ultra Instinct form. In fanfiction, it might be further enhanced, like having different levels that are not shown in the original. For example, he could have an Ultra Instinct - Kaioken combination which would be extremely powerful.
In this fanfiction scenario, it could be an extremely emotional encounter. Goku, who has grown so much in Dragon Ball Super, finally meeting his father Bardock. Maybe Bardock gets to see how his son has not only become a powerful Saiyan but also a protector of Earth. It could lead to some interesting exchanges about Saiyan heritage and the future of the Saiyan race.
Caulifla and Goku's relationship in fanfiction could be really interesting. Maybe in this fanfiction, they start as rivals. Caulifla, with her Saiyan pride, wants to prove she's stronger than Goku. But as they fight more, they begin to understand each other's fighting styles and develop a mutual respect. This could lead to some really cool training sessions where they both learn new techniques from one another.
In this fanfiction, aside from Gohan, there could be other characters. For instance, Piccolo. Piccolo might sense Goku's power and be both intrigued and a bit wary. He could approach baby Goku to either assess the threat or try to understand his power source. Also, Chi - Chi might be involved. Even as a child herself, she could be drawn to Goku because of his unique presence and power, which could start their early relationship in a different way compared to the original story.