One of the best is 'Castle Crashers'. It has a really fun and engaging story where you play as a knight on a quest to rescue princesses and defeat an evil wizard. The art style is colorful and the co - op mode adds to the enjoyment as you can play with friends and experience the story together.
Perhaps he has been exposed to some sort of deadly and unknown substance in the mythical world. This could be a new type of monster venom or a strange plant that he accidentally ingested. The substance could be attacking his body from the inside, causing his internal organs to bleed, and thus he throws up blood.
The Cyclops Tyson could be an ally. He has a strong bond with Percy and his strength could be a great asset. In a fanfiction where Percy is the God of Light, Tyson could be like a protector of Percy's light - based temples or strongholds. Also, the sea creatures that Percy has befriended over the years might come to his aid. Since Percy has his roots in the sea and now has light powers, they could work together in a unique way, like the sea creatures using their natural abilities to help spread Percy's light across the oceans to keep dark sea - based threats at bay.
Percy's character would be very different. Growing up alone, he would lack the social skills he has in the original series. He'd be more introverted. His view of the gods would be more cynical as he has no one to tell him the 'glorified' stories. He'd have to learn about his powers through trial and error, which would make him more cautious. He may also develop a stronger survival instinct. His relationships would be different too. He might be more hesitant to open up to others when he finally does meet people. Overall, his character would be a loner with a unique perspective on the demigod world.
Grover would be panicked. He's Percy's friend and he cares a great deal about him. He might start running around trying to find help, like looking for a healer or someone with magical healing abilities. He'd probably be muttering to himself about how he should have protected Percy better.
A good beat em up game with story is 'Shank'. The story is about Shank, a former mob enforcer seeking revenge. The game has a very cinematic feel to its story - telling, with lots of cut - scenes and a gritty art style. 'River City Ransom: Underground' is another one. It's a remake of the classic 'River City Ransom' with an updated story. You play as characters trying to save their city from various gangs and also has some RPG elements that tie into the story and gameplay.
It could start with Artemis getting into a situation where she's in a vulnerable position. Maybe she's been lured into a place where her powers are diminished. Percy, being a friend and an ally, rushes to her aid. Along the way, he has to fight through hordes of lesser monsters, which takes a toll on him. When he finally reaches Artemis, they are confronted by a really powerful adversary. Percy realizes that the only way to save Artemis is to take the full brunt of the enemy's attack himself. So he does, and that's how he dies.
In fanfiction, Percy could throw up because of intense emotional stress. Think about it, if he's faced with a situation where he might lose his friends or family, the anxiety could be so overwhelming that it affects his physical state. He might also be exposed to some kind of dark magic that has a negative impact on his body. And sometimes, fanfiction writers like to put their characters through really tough physical challenges, like running for days without rest, which could lead to exhaustion and vomiting.
Try this one: 'Are you a demigod? Because you've got the power to make my heart race faster than a satyr at a party.' Satyrs in the series are known for their energetic and wild nature, so comparing the effect the person has on your heart to a satyr's energy is a fun way to flirt. It also ties in the concept of demigods which is central to the Percy Jackson world.