It's really hard to say. Ben at his strongest has access to some incredibly powerful alien forms. But Goku at his strongest can literally destroy universes. However, if Ben could transform into an alien with reality - warping powers, he might have a chance. But Goku's speed and combat experience are also very high. So it could go either way depending on the situation.
It really depends on the situation. If it's in a magical environment like Hogwarts, Harry might have an advantage with all the spells he knows. But if it's an open area, Ben with his Omnitrix could transform into an alien like Way Big and overpower Harry with his size and strength.
It's hard to say, but Goku would be a top contender. His ability to constantly power up and reach new levels of strength like Super Saiyan God and Ultra Instinct is insane. But Ben in his Alien X form from the Omnitrix also has near - omnipotent powers. So it could really go either way depending on how the fanfiction writer sets up the battle conditions.
Obviously, Ben Tennyson is one of the main characters. He is the central figure around whom the story revolves. And the 'babies' are also main characters, though who they are exactly can vary. They could be new alien forms that Ben discovers and takes under his wing, or they could be some sort of younger versions of himself or other characters related to the Ben 10 universe.
It really depends on the situation. If the fight takes place in Gotham, Batman has the home - field advantage. He knows all the alleys, rooftops, and secret passages. But Ben has his powerful alien forms. If he turns into Four Arms, he has super strength which could give Batman a hard time.
It's really hard to say. Goku from Dragon Ball Z is extremely powerful, with his Super Saiyan forms and ability to destroy planets. But characters in Fairy Tail like Acnologia are also very strong. Acnologia is a dragon slayer who can transform into a dragon himself. However, if we consider Goku's continuous growth in power and his combat experience against powerful foes across the universe, he might have the edge in a fight.
Goku would likely win. Goku has the ability to reach extremely high power levels like Super Saiyan and beyond. His ki attacks are incredibly powerful and his speed is off the charts. Naruto is strong but his power is more limited compared to Goku's ever - increasing power scale in Dragon Ball Z.
It's hard to say. Goku has his Super Saiyan forms which give him incredible strength and speed. But Flash is known for his super - speed. If it's a short - distance race, Flash might have the edge. However, in a full - on battle where strength also matters, Goku could use his energy blasts and fighting skills to overpower Flash.
Another plotline might involve Ben protecting his 'babies' from an enemy that specifically targets them because of their relation to Ben or their potential power. He'd have to use his experience and the various alien forms at his disposal to keep them safe.
It's really hard to say. Goku has his Super Saiyan forms which give him incredible power boosts. But Superman has super strength, heat vision, and is nearly invulnerable. In a short fight, Superman might have the edge due to his instant powers like flight and super strength without having to power up. But if Goku manages to reach his higher Super Saiyan forms and uses techniques like the Spirit Bomb, he could potentially defeat Superman.
It's hard to say. Ainz Ooal Gown has a vast array of powerful magic spells at his disposal. However, Ben when he transforms into Alien X could be extremely powerful as well. Alien X has reality - warping abilities. But Ainz has his intelligence and strategic thinking. So it could really go either way depending on the situation.