Kronos is another possible opponent. He is a powerful Titan and Percy has already had several encounters with him. In a death battle fanfiction, Kronos could be at his full strength, and Percy would have to use every ounce of his power and the help of his friends (if any) to stand a chance against him.
One likely opponent is Luke Castellan. Since they have a complex relationship in the original series, it would be a very emotional and intense battle in fanfiction. Luke has his own set of skills and powers, and his motives would make the battle even more interesting.
Another common opponent could be other demigods from different cabins. For instance, a child of Ares who might have a more aggressive and straightforward fighting style compared to Percy. This would create an interesting dynamic as they have different powers and personalities but are still on the same side in the general scheme of things.
Monsters from Greek mythology are also very common. Giants, like the ones Percy faced in the original series, are frequently used. They are powerful and require Percy to use his water - based powers in creative ways to take them down. It's a classic type of fight that fans love to read about.
Percy could be a strong contender too. He has a lot of charisma and can be very persuasive. His experiences with the gods and his adventures would give him plenty of material for his raps. He could use his connection to the sea to create some really powerful and unique lyrics that would wow the crowd.
Superman can also be an opponent in some 'death battle batman fanfiction'. It's an interesting match - up as it pits Batman's brains and preparation against Superman's superhuman strength. Writers often explore how Batman could potentially defeat someone so much more powerful.
His mother, Sally Jackson, could play an important role as an ally. She has a strong will and has always been there for Percy. Also, Tyson, his cyclops half - brother, could be a powerful ally with his strength and loyalty. And don't forget about the Nymphs. Some of the water nymphs might help Percy since he has a connection to water.
Perhaps there could be a team of demigods from another camp. They see Percy as a threat on the soccer field and want to prove that their camp is better. They might use their own unique powers during the game in an attempt to outplay Percy. For example, a demigod from a fire - based camp could heat up the soccer ball to make it difficult for Percy to handle.
Venom is a very common opponent. Given their history in the official comics, it's natural for fanfiction to explore their battles further, especially in a death - battle scenario where the stakes are even higher. Their symbiotic relationship adds an extra layer of complexity to the fight.
Vali is also a likely winner in many scenarios. His Divine Dividing ability gives him an edge in combat, being able to halve his opponent's power and double his own. In a death battle, this could be a game - changer.
Annabeth is a very likely ally. Their relationship is so strong that she would follow him into Tartarus and be by his side through thick and thin. Grover could also be an ally. He's Percy's long - time friend and his skills as a satyr could come in handy in Tartarus. Nico di Angelo is another possibility. His knowledge of the Underworld and his powers over the dead could be useful in the dangerous Tartarus environment.
Draco Malfoy would be a likely character. Given his Slytherin status, he would likely have a complex relationship with Percy. He might start off as hostile, seeing Percy as an outsider, but then they could end up having to work together for some reason.