His courage would be a huge plus. Harry has faced many terrifying things in the wizarding world, so the danger in the Hunger Games might not seem as overwhelming at first. He would be more likely to take risks when necessary.
Harry's intelligence is also a key factor. He could analyze the arena, figure out the patterns of the traps and the habits of the other tributes. For example, he might notice which areas are more likely to have food sources or safe hiding places. And his ability to think on his feet, like when he was in the Triwizard Tournament, would give him an edge in the Hunger Games.
Harry's loyalty to his friends and the wizarding world might make him compare the relationships in the multiverse fanfiction to his own. He might be a bit critical if the portrayals of friendship or loyalty were very different from what he knows.
Percy is brave and impulsive. In the Hunger Games, this could lead him to take risks right away. He might not be as cautious as some tributes, but his bravery could inspire others. His loyalty would also mean he'd be a good ally, always looking out for those he trusts.
I think Hermione would be the most interesting. She's so intelligent and resourceful in the Harry Potter series. In the Hunger Games, she would be able to analyze the situation quickly, figure out the best hiding places, and find ways to outwit the other tributes. Her knowledge of magic would also give her an edge, like using spells to find food or water.
Harry Potter himself might be a likely candidate. He has experience in facing life - threatening situations and has a strong sense of justice. His skills with a wand could give him an edge in combat and in finding resources. For instance, he could use the Patronus charm to keep away dangerous creatures in the arena.
Naruto's determination would make him not easily give up in the tough environment of Prison School. He'd keep trying to improve his situation and grades if there are any. His friendly nature would also help him make friends, or at least try to, with the other students who might initially be wary of him.
The stilettos could slow him down during his adventures. He wouldn't be able to move as quickly as he usually does in his normal shoes or boots. This could put him at a disadvantage when facing danger, like when running from Death Eaters.
If he transfers, his relationships with his Hogwarts friends would be greatly affected. Hermione and Ron might feel betrayed or worried about him. They might try to convince him to come back. His relationships with his teachers would also change. Some teachers might be sad to see him go, while others might think it's for the best.
Padme's strong sense of justice would make her a natural ally in the fight against the Dark Arts. She would be appalled by Voldemort's actions and would likely join the Order of the Phoenix. Her courage would also shine through, whether it's facing Death Eaters or standing up to the more bigoted wizards in the Ministry of Magic.
She might become more hardened. The brutality of the Hunger Games could force Hermione to be more ruthless in order to survive. However, she'd still likely hold onto her core values of justice and fairness.
It could be really exciting. Imagine Harry Potter characters in the arena of the Hunger Games. Maybe Harry would use his magic skills to survive, like creating protective spells against the various threats in the arena. Hermione could use her intelligence to strategize, similar to how tributes in the Hunger Games plan their moves.