I think Poseidon would be really interesting in a Percy Jackson family vacation fanfic. He's a god, so his presence would bring a lot of power and mystery. He could show up unexpectedly and take the family on a journey through the underwater kingdom, showing them things they've never seen before. He might also have some father - son bonding time with Percy, which could be really heartwarming and at the same time full of godly wisdom.
Annabeth could be the most interesting character. She's smart and resourceful. In a family vacation scenario, she could be the one planning all the trips and adventures. She might figure out how to navigate through a maze - like ancient ruin they stumble upon during their vacation, using her knowledge of architecture and mythology to keep the family safe and on track.
Percy himself would be very interesting. He has all his demigod skills and his experiences always lead to some exciting situations. Just imagine him trying to have a normal beach vacation but then getting dragged into an underwater adventure by some sea - related mystery.
Annabeth from Percy Jackson could be the most interesting. She's highly intelligent and strategic. In a crossover with Twilight, she would be the one trying to figure out how the vampires work and how to use their abilities to their advantage. She might also be a bit suspicious of them at first and would be constantly analyzing their every move, which could lead to some really engaging scenes in the fanfic.
It could be Carter Kane. His leadership skills and his deep knowledge of Egyptian magic would be crucial in the story. He is more reserved than Sadie but has a strong sense of duty. When paired with Percy, he could learn a lot about different ways of fighting and protecting, and his character growth as he adapts to working with demigods would be an interesting aspect of the fanfic.
Another interesting interaction would be between Annabeth and Tony Stark. Annabeth is highly intelligent and strategic, much like Tony. They could either be in a battle of wits, constantly trying to one - up each other in terms of coming up with plans, or they could end up working together really well. Annabeth could teach Tony about ancient Greek architecture and strategy, while Tony could show her some of his latest high - tech inventions.
Grover from Percy Jackson would also be a fascinating crossover. His connection to nature and his ability to sense things that others can't would be really cool in the Twilight world. He could befriend the werewolves because of their connection to nature as well. And his generally nervous but loyal personality would add a different flavor to the interactions in the Twilight world.
Percy and Cloud. Cloud is a brooding and powerful character from Final Fantasy, and Percy is a brave and resourceful demigod. Their different personalities and powers would create an interesting dynamic. They could learn from each other, like Percy teaching Cloud about the Greek gods and Cloud showing Percy some of his sword - fighting techniques.
Percy Jackson and Thor would be an interesting pairing. Percy has his water powers and connection to the sea, while Thor has his lightning powers. They could have some really cool battle scenes together, like when they face a water - and lightning - based enemy. Also, they both have a bit of a sense of humor and a heroic nature, so they'd probably get along well.
Definitely Percy and Tony Stark. Percy is this young, powerful demigod from a world of magic and myth, while Tony is a genius billionaire with high - tech gadgets. Their interactions would be filled with banter. Tony would be constantly trying to figure out how Percy's powers work and Percy would be both amazed and a little put off by Tony's arrogance at times.
Daenerys Targaryen would also be a top candidate. Her quest for the Iron Throne and her connection with her dragons. When she meets the demigods, she might see them as either threats or potential allies. Her experience with magic and her strong will would make for some intense interactions with the Percy Jackson characters, especially when it comes to issues of power and leadership.
I think Percy Jackson and Thor would make an interesting pairing. Percy has his power over water and is a skilled swordsman, while Thor has his mighty hammer and control over lightning. They both come from different worlds of power but have a lot in common. They could have some epic battles together against common enemies, like frost giants or sea monsters. And they could also exchange stories about their respective homes and families.
In a Percy Jackson family vacation fanfic, there could be a lot of adventure. For instance, they could be traveling through a forest and stumble upon an ancient, lost temple. Inside, there are puzzles and traps that they have to overcome together as a family. Percy would use his skills, his mom could offer her wisdom, and Poseidon might show up to help at a crucial moment. And of course, there would be some humorous moments, like when they try to cook normal food but end up with some sort of magic - infused meal because of a spell gone wrong.