In a kratos vs naruto fanfic battle, Naruto might have a chance if he uses his strategic thinking. He could use his shadow clones to surround Kratos and then attack from all sides. But Kratos is no pushover. His experience in combat is vast. He has fought against opponents with all kinds of powers. If he manages to break through Naruto's clones and get to the real Naruto, it could be over. However, Naruto also has his sage mode which gives him enhanced strength and perception. So it's a very tough call.
One idea could be a battle in a neutral dimension. Kratos, with his brute strength and god - slaying weapons, faces Naruto's ninjutsu and his ability to summon powerful creatures. Another idea is that they are forced to team up against a common enemy that threatens both their worlds. They start off clashing due to their different fighting styles and beliefs but gradually learn to work together.
Well, it really depends on how the fanfiction is written. If the writer decides to give Percy some new powers or boost his existing ones, he could stand a chance against Kratos. However, Kratos is a force to be reckoned with. He's faced the most terrifying foes in his own universe. Percy is used to fighting monsters in the world of Greek mythology, but Kratos has fought gods on their own turf. So generally, Kratos has more of an advantage.
In an Atom vs Zeus fanfic, a power - exchange scenario could be interesting. Zeus somehow loses his powers and Atom has to help him get them back. In the process, Atom experiences what it's like to have godly powers for a short time and Zeus learns about the potential of human - made technology. This could lead to a lot of humorous and also thought - provoking moments as they both adapt to their new situations.
One interesting plot twist could be that Percy discovers a way to nullify Kratos' god - given powers. Maybe he finds an ancient artifact during the fight that has the ability to do so. Another could be that Kratos, instead of seeing Percy as an enemy, realizes they have a common goal against a greater evil in the fanfiction world and they end up teaming up.
For Atom, you can emphasize his scientific curiosity. Show him constantly observing Zeus' actions and trying to find logical explanations for Zeus' godly powers. As for Zeus, highlight his pride in his divinity. He could be initially dismissive of Atom but then gradually come to respect him. For example, Atom could analyze the weather phenomena that Zeus controls, and Zeus could be amazed at Atom's in - depth understanding of nature from a scientific perspective.
Their interaction would be tense at first. Young Kratos, full of energy and unbridled aggression, might see old Kratos as a threat or an obstacle. Old Kratos, on the other hand, would be more reserved and cautious. But as they start to communicate, they would find common ground in their shared past and their connection to their family.