If Percy can turn into a cat, his daily life would be a mix of challenges and advantages. In terms of advantages, he could move around more quietly and unnoticed in his cat form. This would be useful if he wanted to avoid someone or just explore secretly. However, it would also be difficult. He'd have to make sure he has appropriate places to transform. And he'd need to be aware of how his cat form behaves. For example, he might be more tempted to sleep in warm sunny spots during the day instead of doing his chores or homework. His diet might also be affected as a cat he might be more interested in small animals or fish, but as a human, he has different eating habits. Also, his social life could be different. Some people might be afraid of cats, so he'd have to be careful when approaching them in his cat form.
Well, it would change a lot. For one, he would need to find places to hide when he turns into a cat unexpectedly. Also, he might develop new relationships with the local cats in his neighborhood. He could use his cat form to explore parts of the town that he couldn't reach as a human, like rooftops or small alleys. But he would also have to deal with the fact that his cat instincts might take over sometimes, like chasing after a mouse instead of going to a meeting. And he'd have to keep his secret from those who might not understand or might try to use his power for their own gain.
Well, perhaps in this fanfic, Percy discovers his ability to turn into a cat by accident. He might be in a magical forest and comes across an ancient spell or a magical creature that bestows this power upon him. As a cat, he starts to see the world from a different perspective, and he meets other magical cats that teach him about a hidden world of magic that he never knew existed before. This could lead to a whole adventure where he has to protect this hidden world while also dealing with his normal life when he's human.
His water - controlling powers could cause some interesting situations. For example, if there was a leaky faucet in the classroom, he could accidentally make the water spray everywhere in a fit of distraction. Or he could use it to create a cool mist during a hot day to cool down the classroom, much to the surprise of his classmates.
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Well, it could make his breathing underwater effortless. He can explore the underwater world more freely without worrying about running out of air. It might also give him an advantage in battles underwater, as he can stay submerged for as long as he needs.
Percy might also become a bit more self - aware. When he sees how different he can be in other universes, he will start to think more about his own identity. He may realize some of his own strengths and weaknesses that he hadn't fully recognized before. And this new self - awareness could help him grow as a character and a hero.
In his romantic relationship, if he has one, it could be really tough. His partner might feel helpless and scared. They might have to deal with the possibility of losing Percy, which could bring out different emotions like denial, anger, and then acceptance. It could also make their bond stronger in some ways as they face this difficult situation together.
His ability to communicate with sea creatures might seem strange for football, but what if there are some sort of water - based spirits in the stadium's plumbing? He could get some 'inside information' about the field conditions or even use them to spook the opposing team. Also, his enhanced strength as a demigod would surely make him a force to be reckoned with when it comes to tackling or blocking.
He might spend a lot of time reading, which could reduce the time he spends on other activities like socializing or doing his own work.
His scar might make some people more intimidated by him. They could see it as a sign of his dangerous experiences and be a bit afraid to get too close. For example, new acquaintances in the fanfic might be hesitant to approach him at first.
Hermione would be overjoyed. She'd probably start researching immediately how it happened and what implications it has for magic. Ron would be both happy and a bit in awe, like he was when they first became friends with Harry. For Ginny, it would be a huge relief and she'd be very emotional, as she lost the love of her life.