It's hard to say for sure. Hulk has immense strength, but Batman is extremely smart and strategic. It could go either way depending on the circumstances.
It depends on the situation. If Naruto has access to his full power, like the Six Paths Sage Mode and can use all his ninjutsu skills, he could potentially outmaneuver the Hulk. He could use clones to confuse the Hulk and then hit him with a powerful Rasengan. But if the Hulk gets really angry and reaches his World - Breaker level of strength, he might be able to overpower Naruto with his sheer brute force.
Kratos might win. He has fought and defeated many powerful gods in his own world. He is not only physically strong but also very strategic. He could analyze the Hulk's movements and find his weaknesses. The Hulk, while strong, is more of a brute force fighter. Kratos could use his Blades of Chaos to keep the Hulk at a distance and then strike when the opportunity arises. Also, Kratos has faced opponents much larger than him before and has always found a way to win.
It's really hard to say. Harry Potter has some very powerful magic at his disposal. He could potentially use a spell to send the Hulk to another dimension or something. But the Hulk's raw power is so great. If he got his hands on Harry, it would be over. So, it could go either way depending on how the fanfiction is written.
In my opinion, Hulk has a better chance. His rage and superhuman strength make him a force to be reckoned with. But Venom's adaptability and symbiotic powers could pose a challenge. Ultimately, it's up to the comic's plot and how the characters are depicted at that moment.