Batman's brooding and serious personality would likely have a big impact on Shazam. Shazam is more light - hearted and naive, so Batman's influence could make him more cautious. For example, Shazam might not rush into battles as quickly.
Batman's brooding and serious personality would likely make Harry more cautious. Batman is all about planning and preparation, and Harry would pick up on that. For example, Harry might start to analyze magical situations more thoroughly before acting, instead of just relying on his instincts.
Damian would likely become more cynical in the Batman Beyond setting. The darker, more technologically advanced yet decaying Gotham would harden his already tough personality. He'd probably be less trusting, especially with all the new threats that come with advanced technology.
Well, Batman as a kid in fanfiction would have a very different personality. His determination would still be there, but it would be mixed with a child's innocence. He'd be more likely to make mistakes based on inexperience, but also more willing to forgive and forget. His sense of humor might emerge more, as kids tend to find humor in different things. He could also be more vulnerable, which would make his relationships with other characters more complex. For example, his relationship with Alfred would become more of a father - son dynamic, with Alfred having to be more protective and nurturing.
Naruto's personality would become more brooding. He would be less impulsive and more calculating, like Batman. He might not be as openly friendly as he was before, keeping his thoughts and plans more to himself.
He might become more confident, bordering on overconfident at times. With superpowers, he would have a greater sense of invincibility, which could make him a bit more reckless in his actions compared to his non - superpowered self.
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.
Given Batman's often solitary nature and Wonder Woman's more community - oriented nature, their child could have an internal struggle. They might be introverted like Batman at times, preferring to work alone on a problem, but also feel the pull towards being more involved with others like Wonder Woman. This duality in their personality could lead to some interesting character development as they grow up, trying to find a balance between their two parental influences.
He might become more confident. Batman is already a confident character, but with Superman's powers, he'd have a new level of assurance. He could take on any threat without hesitation.