Batman's personality would be radically different. He would be more power - hungry. Growing up with Darkseid, he would see power as the ultimate goal. He'd be less empathetic and more about achieving dominance, not justice.
If Batman were raised by Darkseid in fanfiction, his personality would shift towards the darker aspects of his character that are usually held in check. He would be more authoritarian, believing in Darkseid's way of ruling. His sense of right and wrong would be blurred, as he would be indoctrinated with Darkseid's ideology. He might lack the sense of humor and light - heartedness that sometimes shows through in the regular Batman. His interactions with others would be more about control and less about cooperation. His values would be centered around Darkseid's view of strength and subjugation, rather than the protection of the innocent that defines the traditional Batman.
His sense of justice could be warped. Naruto has always fought for what he believes is right, but as a Darkseid fan, he might start to think that power is the ultimate arbiter of right and wrong. This could lead him to make decisions that are more self - serving rather than for the good of the village. For example, he might pursue power at all costs, even if it means sacrificing the safety of his friends in the short term to gain more strength in the long run. He would become more calculating and less impulsive in his actions, which is a big change from his usual head - first style of dealing with problems.
His personality might be more reserved. Tsunade is not as boisterous as some of Naruto's other mentors. So he could be less likely to jump into things without thinking. For instance, he might analyze a situation more carefully before acting.
His sense of loyalty might change. While Naruto is fiercely loyal to his friends and village in the original story, being raised by Catwoman could make him more loyal to a smaller, more select group. He might also be more cautious about who he gives his loyalty to, as Catwoman is often on her own and has to be careful about who she trusts.
Batman would be in a tough spot. Darkseid is extremely powerful. But Batman is not one to give up easily. He might try to analyze Darkseid's powers and find a way to counter them, even in captivity.
There probably is. Given the popularity of both Darkseid and Batman in the DC universe, it's a common and rather dark theme for fanfiction writers to explore. Some might write it to show the extreme power of Darkseid, while others may use it as a starting point for a more complex alternate universe story where Batman's death has far - reaching consequences for other characters.
Superboy would likely become more brooding. Batman's influence would make him more cautious and less impulsive with his powers.
Naruto's personality would be a blend of his original self and Zeref's traits. He may still have his determination but it could be a darker kind of determination. His sense of humor would probably be lost as Zeref doesn't seem the type to encourage light - heartedness. Also, he could be more secretive, not as open as he is in the original Naruto series because Zeref often keeps his own council.
His personality would probably be more cold and calculating. Voldemort's influence would make him less empathetic. He might be more ruthless in achieving his goals.
Naruto might be more assertive. Since Kushina was a strong - willed person, Naruto would likely inherit some of that. He would be less likely to be pushed around and more likely to stand up for himself earlier. Also, he might be more family - oriented as he would have grown up with a loving mother figure in Kushina.
If Luffy was raised by Whitebeard in fanfiction, his personality would undergo several changes. He would still be the kind - hearted and adventurous Luffy we know, but with added layers. He would probably be more protective of his crewmates, not just in a fight - or - flight way but in a more paternal way like Whitebeard. His sense of justice might also be influenced by Whitebeard's own moral code. He might be less impulsive when it comes to making decisions that affect the whole crew. Instead of just following his gut instincts all the time, he would consider the well - being and opinions of his crewmates more. Also, his leadership style could be a blend of his natural charm and Whitebeard's strong leadership, making him an even more formidable captain.