One popular concept is the fusion of Saiyan and God powers leading to a mutation. In many fanfictions, Goku's Saiyan heritage combines with the power of the Gods in a way that changes his appearance and abilities. His hair might turn a golden - white color permanently, and he could gain the ability to create and manipulate divine energy. Another is the mutation caused by ancient Dragon Ball wishes. If a wish goes wrong or has some unforeseen side - effects, it could mutate Goku. For example, he could end up with the ability to transform into a dragon - like form.
The idea of Goku mutating due to exposure to different types of Ki is quite popular. For instance, if he's exposed to the Ki of a powerful and alien entity, his body could mutate to better handle and utilize that Ki. This might result in changes like his eyes glowing a different color all the time and his attacks becoming a mix of his normal Ki attacks and the new alien - influenced Ki. Also, the concept of Goku mutating as a result of time - travel paradoxes is seen in some fanfictions. He might come back from a time - travel adventure with some strange mutations that are a result of the altered timeline.
A lot of fanfictions explore the mutation of Goku after he absorbs a powerful artifact. Let's say he finds an ancient relic that contains a vast amount of energy. Once he absorbs it, his body mutates. His muscles might become more defined, and his speed and strength increase exponentially. He could also develop new psychic abilities. Another popular concept is Goku mutating because of a genetic experiment. Some mad scientist in the Dragon Ball universe could try to enhance Goku's genes, which leads to unexpected mutations that give him new forms and powers.
Well, one way is to look at different species in the Dragon Ball universe. For example, take the Saiyan and mix it with some other unique traits. Maybe combine Saiyan genes with the Namekian ability to regenerate. Writers could also consider environmental factors that might cause a mutation. What if Goku was exposed to some super-rare energy during a battle in a far - off planet? Another idea is to play with magic or ancient powers. If there's a long - forgotten spell that alters his genetic makeup in a strange way, that could lead to a really cool mutation.
Well, one creative idea is a fanfiction where Goku Black teams up with his alternate selves from different timelines. It would be really cool to see how their combined powers and different personalities interact. They could create a super - powerful force that no one in the Dragon Ball universe could expect.
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 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 a fanfiction, Goku might be weakened due to a curse. He loses his Super Saiyan powers and has to start from scratch. This could lead to a great character - development arc. He might discover new ways to fight without relying on brute strength, like using his wits and strategic thinking more, and also learning new martial arts techniques from his human friends.
Perhaps a fanfiction where Vados senses a new threat approaching the universe. She enlists Goku to help her find a way to stop it. Along the way, they encounter strange new races and powers. Goku's simple but powerful approach to fighting combined with Vados' wisdom would make for an interesting dynamic as they search for a solution to this impending doom.
One popular storyline could be Goku using his smarts to outwit a new and powerful enemy that can't be defeated by brute strength alone. For example, he might figure out the enemy's weakness through careful observation and analysis, much like a detective. Another could be Goku using his intelligence to solve a problem in the Dragon Ball universe that affects all the characters, like a mysterious energy drain. There are also fanfictions where Goku's smart side helps him train his friends more effectively, leading to new power - ups for everyone.
One popular 'Dragon Ball Goku Harem' fanfiction might be the ones where Goku's relationships with different characters are explored in a non - romantic sense, like his friendships with his Z - Fighter comrades but in a more in - depth way in the fanfiction world. For example, stories that focus on how Goku's positive attitude influences those around him within the harem - like group of friends.
One interesting concept could be a female Goku having a different approach to training. Maybe she focuses more on finesse and speed rather than brute strength like the male Goku. She could also have a different relationship with the other Z - fighters. For example, her interactions with Vegeta might be less combative and more of a friendly rivalry.
In this fanfiction, they might have an epic sparring session. Adult Goku could teach Kid Goku some new techniques, like the Instant Transmission. It would be amazing to see how Kid Goku reacts to Goku's Super Saiyan forms.