In a 'Goku God of Destruction fanfiction', it could be interesting to see Goku training other potential Gods of Destruction. He could pass on his Saiyan fighting spirit and unique understanding of power to new recruits. This would involve a lot of action - packed training sessions and also some comical moments as Goku tries to teach in his own unorthodox way.
One idea could be Goku struggling to adapt to the role of God of Destruction. He's used to being a protector, so having to destroy planets as part of his new duty would create a great internal conflict.
Perhaps a fanfiction where Goku as the God of Destruction has to face an ancient evil that even the other Gods are afraid of. He would have to use his new powers and the wisdom of destruction in a way he never has before. He might also have to make some tough choices between saving his friends and following the rules of destruction.
One interesting 'God of Destruction Goku fanfiction' could be where Goku takes on the role of a God of Destruction in a different universe. He might have to deal with new threats and use his Saiyan powers in unique ways. For example, he could face off against an enemy that can manipulate time and space, and Goku has to find a way to overcome this using his God of Destruction powers.
Vegeta would be a great addition. His rivalry with Goku and his pride as a Saiyan would add an interesting dynamic. He might be initially jealous that Goku is getting to fight and train with the God of Destruction. But then he would also want to prove himself and join in the action. Whis could also be included. His knowledge and calm demeanor could help in situations where the power of Goku and the God of Destruction gets out of hand.
One interesting concept could be Goku's transformation into a God of Destruction - like form. It might involve new powers and a different way of handling battles.
One possible plot could be Goku, in his Saiyan tenacity, challenges the God of Destruction to a friendly spar. The God of Destruction initially scoffs but is soon impressed by Goku's power. As they fight, their powers start to blend, creating new energy forms that threaten to disrupt the balance of their universes. They then have to team up to contain this new energy while also learning from each other's fighting styles.
One idea could be that Goku is transported to the realm of the gods and has to participate in a divine tournament. He'd face off against powerful god - like beings using his Saiyan strength and martial arts skills. His Saiyan pride and determination would make him a formidable opponent even among the gods.
Goku becoming a God of Destruction could mean a new look for him. Maybe his Saiyan armor would transform into something more fitting for a god, with a more regal and powerful appearance. His power level would skyrocket, and he could start to have an influence on the balance of the universe. He'd also likely have to deal with other gods, which would lead to some interesting interactions.
One plot idea could be Percy discovers his new power as the God of Destruction gradually. He might start by accidentally causing small disasters, like making a small pond dry up. As he learns to control it, he could face a great enemy that only his destruction powers can defeat. For example, a powerful titan who is immune to all other forms of attack.
Vegeta could be a great rival. He might see Goku's new position as God of Destruction as another thing Goku has achieved that he hasn't. This could fuel their competitive nature even more.
Goku does reach a state of immense power in the manga that rivals that of a God of Destruction. However, the specific title and all its implications might not be straightforwardly assigned to him. It's a complex development within the story.
In this fanfiction, Naruto could gain the powers of a God of Destruction through a special encounter. Maybe he meets an ancient being who sees his potential. His training to control these powers would be intense. He would have to learn to balance his old ninja values with the new role of maintaining balance in the universe through destruction when necessary.