Jude could be a likely hero. He's always been kind of a risk - taker and he might be brave enough to face the zombies head - on. His quick - thinking could help the group get out of tight situations.
Harry Potter himself would be a likely hero. He has already faced Voldemort and numerous other dark threats, so he has the courage and experience. His ability to think on his feet and his connection to the powerful Patronus charm could be very useful against the zombies.
Stan could be a likely hero. He's often the voice of reason in the show. He would probably be the one to come up with a practical plan to survive the zombie apocalypse, like finding a secure place to hide and stockpile supplies. He also has a strong moral compass which would help him make decisions about whether to help other survivors or not.
The members of Team JNPR could also be likely survivors. Jaune has grown a lot in his skills. His leadership and swordsmanship could be useful. Pyrrha, if she were still alive in this fanfic scenario, would be a great asset with her combat abilities. Ren's calm and collected nature, along with his stealth and combat skills, would help him survive. And Nora, as mentioned before, would be a great addition to the group of survivors. They could work together with Team RWBY to face the zombie apocalypse.
Todoroki is another possibility. Given his complex backstory and his struggle with his two different powers, the mask could symbolize his journey to fully accept himself. It could be a catalyst for him to merge his fire and ice powers in a new and unexpected way, or it could hold the key to unlocking some hidden aspect of his family's past that impacts his hero identity.
GoGo could be a main character. She's strong - willed and independent in the original Big Hero 6, and in a Yuri fanfic, she could be in a relationship or have strong emotional ties with another female character. Honey Lemon is also likely. She's kind and creative, and her personality would make her a great candidate for a Yuri - themed relationship. They could be exploring their feelings for each other in the fanfic.
I think Booster Gold could be a very unexpected hero. He's often seen as a bit of a joke, but during an Infinity Crisis, he could use his knowledge of future events (even if it's a bit hazy) to help the heroes. His time - traveling gadgets might also come in handy in dealing with the complex and chaotic situation of the crisis.
In an Infinity War - like scenario in a fanfic, Todoroki Shoto would be highly likely to be involved. His dual - natured quirk of ice and fire gives him a wide range of abilities that could be useful against different threats. Momo Yaoyorozu would also play a key role. Her quirk allows her to create various objects, which could be essential for coming up with strategies to counter the Infinity War - like threats. Additionally, Aizawa Shota, with his Erasure quirk, could be a game - changer. He could potentially nullify the powers of some of the more dangerous villains or threats in the scenario.
I think Batman has a good chance. He's a master strategist and is used to working alone. He has a wide array of gadgets and his detective skills would be very useful in a post - apocalyptic world. He could also use his knowledge of Gotham's underworld to survive.
Definitely Harry Potter himself. He has faced so many dark and dangerous things already, so he'd be able to handle zombies. Hermione would also be a likely survivor. Her vast knowledge of magic and quick thinking would serve her well. And Neville Longbottom. He has shown great courage and has a deep understanding of Herbology, which could be useful in creating defenses or finding antidotes.
I think Naruto and Hiro would be likely to team up. Naruto has his strong will and determination, and Hiro is really smart. Together, they could come up with great strategies in battles. Hiro could use his tech knowledge to enhance Naruto's abilities, and Naruto could teach Hiro about the importance of never giving up.