Definitely Spiderman and Goku. Goku's powerful and pure - hearted nature combined with Spiderman's street - smart and heroic qualities make for an interesting pairing. They could learn a lot from each other.
Another popular pairing is Spiderman with Vegeta. Vegeta's pride and Spiderman's sarcasm could lead to some really fun interactions. And when it comes to fighting side by side, their different combat styles would be fascinating to see merged.
Goten is another character. There are fanfictions that depict a romantic relationship between Bulla and Goten. Their different personalities - Bulla's feistiness and Goten's easy - going nature - can create interesting storylines when they are together.
Riku from Kingdom Hearts and Trunks from Dragon Ball Super also make a great pairing in fanfiction. Riku has his own journey of redemption and growth in Kingdom Hearts, and Trunks has his complex backstory in Dragon Ball Super. Their combined strength and determination could be a central focus in a fanfiction story, perhaps as they face a new and powerful threat that requires both their skills and experiences to overcome.
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.
Some fanfictions pair Towa with Goku. It creates an interesting dynamic as they are on opposite sides of the moral spectrum. The story could be about Towa trying to corrupt Goku or Goku trying to redeem Towa. Their power levels also make for exciting battle scenes or power - up moments within the fanfiction.
Goku is often paired with Gine in fanfiction, as their mother - son relationship can be explored in different ways. Bardock is also a common pairing since he was her husband in the original lore.
Ruby and Goku could be a likely pair. Ruby is young and full of potential, much like Goku was when he started his journey. Goku could be a mentor - like figure to Ruby, teaching her about Ki and new combat techniques. Another pair could be Weiss and Vegeta. Weiss is from a noble family and has a sense of pride, similar to Vegeta. They could have an interesting dynamic where they initially clash due to their strong personalities but then grow to respect each other. Yang and Trunks could also be paired. Yang is a strong and fearless fighter, and Trunks has his own badassery. They could team up in battles and share their experiences of growing up in tough situations.
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.
Goku is often paired with Android 21. Their relationship can be explored in different ways. Maybe Goku wants to test his strength against her, or they could end up training together to face a common enemy.
Goku is, without a doubt, one of the most popular. His constant pursuit of strength and his ability to overcome seemingly impossible odds make him a favorite for fanfiction writers. They can create all kinds of new adventures for him, like facing off against cosmic threats even greater than what he's encountered in the shows.