Piper might be very worried and use her charmspeak to try and keep Jason calm. Leo could use his mechanical skills to build something to help with Jason's injury, like a makeshift stretcher or a device to monitor his condition. Annabeth would probably come up with a strategic plan to get Jason to safety and figure out how to heal him.
One could be 'Jason's Painful Ordeal' where he gets seriously injured in a battle against a powerful new foe. His friends are left to deal with the aftermath, and it shows their grief and determination to save him.
To write a great fanfic about Jason being badly hurt, you need to research. Look at how other fanfics handle injuries. For the story, start with a strong opening that shows the moment of injury vividly. Then, develop the plot around his recovery. Include his friends' reactions, like Annabeth's strategic thinking on how to help or Percy's concern. And don't forget to add some internal monologue for Jason to show his pain and determination.
One common theme is recovery. After getting hurt, the story often focuses on how Jason Grace heals, both physically and emotionally. Another theme is the impact on his relationships, like with his friends in Camp Half - Blood or his romantic interests.
Jason could get hurt by a curse. His physical pain is accompanied by mental and emotional turmoil as the curse tries to corrupt his mind. His friends must find a way to break the curse, which might involve going on a quest to find an ancient artifact or a powerful magician. Along the way, they learn more about Jason's past and the origin of the curse.
Searching on Wattpad could also be fruitful. There are many amateur writers on there who might have created interesting Jason Grace hurt fanfiction. However, the quality can be a bit more variable compared to AO3. You might have to dig a bit deeper and use specific search terms related to the type of hurt (physical, emotional, etc.) and the relationships you're interested in within the story.
One great Jason Grace fanfiction is 'Jason's New Quest'. It takes Jason on an adventure that's not in the original books, with new characters and challenges. It really delves into his character and shows his growth in different situations.
In Percy Jackson and Jason Grace fanfictions, Percy is often seen as more of a maverick. He has a very strong connection to the sea and his own unique sense of humor. Jason, on the other hand, is more of a traditional hero type in fanfictions. He's more rule - bound and has that Roman discipline. Their characterizations can be really different in fanfictions depending on the writer's take.
In some fanfictions, Percy Jackson and Jason Grace can be depicted as brothers. Fanfic writers often like to create new relationships and backstories for existing characters, and this is one such example. It allows for new and interesting plotlines to develop.