Often, Goku is paired with Toppo in fanfiction. Their power levels and different fighting philosophies make for an interesting dynamic. They can have epic battles or team - up against a greater threat.
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.
Goku's understanding of different universes and races could be deepened in fanfiction. Since Dragon Ball Super introduced the multiverse concept, fanfiction could explore how Goku interacts with and learns from beings from other universes, making him more worldly and less naive in some ways.
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.
One possible fanfiction idea could be that Goku's daughter has unique powers that are a combination of his Saiyan strength and something new, like the ability to control time on a small scale. She might struggle to fit in with the other Z - fighters at first because they see her as just Goku's daughter, but she proves herself by facing a new, powerful enemy that the others can't defeat easily.
One interesting fanfiction could be about Toppo's training before the Tournament of Power. It might explore his relationship with his teammates and how he hones his skills. Maybe he discovers a new form during his intense training sessions.
They could have a friendly sparring match. Goku is always up for a good fight, and Caulifla would be eager to test her skills against him. It would be a high - energy battle with lots of fast - paced action and cool power - up moments.
In a fanfiction, Goku's daughter might inherit a special power from her mother (who could be an original character in the fanfiction). This power could be related to healing or some kind of spiritual energy. She uses this power to heal the injured during a big battle against a powerful villain. This makes her an important asset to the Z - fighters, not just because of her Saiyan heritage from Goku, but also because of her unique ability.
It's really hard to say. Goku has his Super Saiyan forms which give him incredible power boosts. But Superman has super strength, heat vision, and is nearly invulnerable. In a short fight, Superman might have the edge due to his instant powers like flight and super strength without having to power up. But if Goku manages to reach his higher Super Saiyan forms and uses techniques like the Spirit Bomb, he could potentially defeat Superman.