Since Black Widow has a lot of experience with different types of weapons, Stiles might inherit an aptitude for weaponry. He could be a natural at using guns, knives, and other gadgets. Also, given Black Widow's training in mental discipline, Stiles could have a strong will and be able to resist mind - control or other forms of psychological attacks, which would be a very useful ability in the dangerous situations often found in fanfiction.
Well, he could have an ability related to perception. Captain America has great situational awareness, and Black Widow is highly observant. So their son might be able to sense danger or read people's intentions really well. He could also have a form of energy projection that is related to the super - soldier serum in Captain America. His physical abilities would likely be above average, with great endurance and speed, similar to his parents. And perhaps he has a special mental connection to his parents' memories or knowledge, which helps him in difficult situations.
He could inherit Naruto's chakra - rich nature. So, he might have a large reserve of chakra like his father. Also, since Naruto has the Nine - Tails' chakra, Minato might have some sort of unique connection to it as well, perhaps being able to access a small portion of its power in a different way than Naruto does. And of course, he could inherit some of Naruto's signature jutsu like the Rasengan, but with his own twist.
Naruto being Harley Quinn's son in this fanfiction could inherit a strange mix of powers. From Naruto, he could get the nine - tailed fox's chakra, which gives him immense strength and regenerative abilities. From Harley Quinn, he might inherit her skill with weapons like her mallet, but also her ability to adapt quickly in chaotic situations. This would be a really interesting blend of two very different power sets, allowing him to be both a strategic fighter like Naruto and a wild card like Harley Quinn.
He would probably inherit Wolverine's healing factor. So Naruto would be able to recover from injuries much faster. Maybe he could also have some form of adamantium - like bones or claws, which would be a really cool addition to his ninja skills.
Since Yoruichi has strong spiritual energy in her world, Naruto might inherit some form of enhanced chakra that has spiritual aspects to it. This could give him new jutsu or abilities that are a blend of his original ninja skills and this new spiritual - chakra power. For example, he could use his new power to sense things in a different way, like Yoruichi can sense spiritual presences.
He could have enhanced physical abilities like Black Widow. So, he'd be super agile, able to jump from high places and land safely, and have great reflexes. Also, he might be a master of disguise, which would be really useful in the wizarding world. He could blend in with different magical creatures or people to gather information.
Some fanfictions give Black Widow the power of mind control or at least a very high - level persuasion ability. This allows her to manipulate situations and people to her advantage during her missions. It's an interesting addition as it plays on her already existing skills in manipulation and espionage.
He could inherit time - related powers. Maybe the ability to slow down or speed up time, which would be a huge advantage in battles. He might also be able to see into the past or future, which could help him in making strategic decisions.
Well, if Percy is the son of Loki in a fanfiction, he could inherit Loki's ability to manipulate minds to some extent. This would give him an advantage in getting out of tricky situations. He might also get Loki's power of teleportation or at least some form of fast movement. And considering Loki's connection to chaos, Percy could have an innate ability to disrupt magic or technology around him. His water - based powers from his Greek side could be enhanced with Loki's chaotic energy, making his control over water more unpredictable and powerful.
He might have enhanced physical abilities. Black Widow is known for her strength, agility, and combat skills. Naruto could inherit these, making him an even more powerful ninja in close - range combat. For example, his punches and kicks could be more forceful.