Goku's powers in a High School DxD fanfiction would be a game - changer. His ki attacks could be on a level that could potentially destroy entire areas in the DxD universe. His martial arts skills are also top - notch. In a fight, he would use his speed and agility to dodge attacks and then counter with his powerful punches and kicks. His transformation abilities, like Super Saiyan, would be a shock to the characters in DxD. They might not have any means to counter such a huge boost in power.
Naruto could fit in as a new transfer student in the High School DxD universe. His out - of - this - world ninja skills would make him stand out immediately. He might initially be confused by the supernatural elements but would quickly adapt and use his skills to protect the school or his new friends from any threats.
Goku would fit in as a super - powerful outsider. His physical strength and combat skills are far beyond what the normal characters in Highschool DxD are used to. He could become a sort of protector for the school, using his powers to fend off any threats that come their way. His energy - sensing ability would give him an edge in detecting hidden enemies.
His ki - based attacks would be a new and powerful addition. In High School DxD, most of the powers are related to magic, sacred gears, and demonic or angelic powers. Goku Black's ki blasts would be a completely different form of energy that could catch everyone off - guard.
In the High School DxD universe, Naruto's chakra might be seen as a new form of energy. His Sage Mode would give him enhanced senses and strength. He could detect the presence of devils and angels from afar. When using Sage Mode, his attacks would be even more powerful. For example, a Sage Mode - enhanced Rasengan could cause massive damage to the toughest of opponents in the DxD world.
Goku Black could potentially enter the High School DxD world through a dimensional rift or some sort of magical accident. Once there, his Saiyan pride and his dark motives (from his own story) could lead to him either trying to take over the various factions in the DxD world or simply looking for a worthy opponent. He might interact with the main characters like Issei, perhaps seeing him as a target to prove his superiority or a potential ally in his own schemes.
Naruto Otsutsuki could fit into the High School DxD universe by being a new and powerful entity. His abilities would be a significant addition. For instance, his transformation abilities like the Nine - Tailed Fox form could make him a force to be reckoned with among the devils, angels, and fallen angels in the DxD world.
Well, he could be a powerful antagonist. His skills and power from the Dragon Ball universe would make him a formidable foe in the High School DxD world. He might be interested in the power of the devils and angels there and try to take it for himself.
Well, Naruto's friendly and outgoing nature would make him quickly form friendships in High School DxD. He could also use his ninja skills to outwit the devils and other supernatural beings in various challenges and competitions within the school. His ability to never give up would inspire the characters in this new world.
Naruto could also be a catalyst for change in the High School DxD world. His values of friendship and never giving up could inspire the characters there. He might introduce new ways of training or fighting. His ability to endure pain and keep going would be something that the characters in High School DxD, who are often more focused on power and status, could learn from. He could also bring a different perspective on the relationships between different species in that world, given his own experiences with different ninja clans and villages.
Naruto could fit in as a new transfer student in the school from the Naruto world. He'd bring his unique ninja skills and his never - give - up attitude. His Rasengan could be a powerful new move in the battles against the various supernatural foes in the DxD world.