Well, he might first struggle with the new physicality. Titans are much larger and more powerful than demigods. He'd have to get used to the increased strength and different abilities. Maybe he starts by testing out his new powers in a secluded area, like a hidden forest or an abandoned island. He'd also need to deal with the mental aspect. Titans have a different mindset, often more focused on power and dominance. Percy, being a good - hearted demigod, would have to find a balance so he doesn't become too power - hungry.
Well, perhaps Percy discovers a hidden power within himself that is linked to time. He might start having visions of past and future events and realizes he has the potential to become the Titan of Time. Maybe he has to go on a quest to find an ancient artifact that will complete his transformation.
He could gain the power of super strength that far surpasses his demigod strength. This would allow him to lift extremely heavy objects or even mountains. Another power might be the ability to control the very essence of the ocean on a global scale, not just local waters like he could as a demigod.
In the fanfiction where Percy Jackson becomes a Titan of Time, his very nature would be transformed. His perception of the world around him would be different as he could now view time as a malleable entity. He might start to see events not just as they happen in the present, but also how they are connected through the past and future. His role as a hero would take on a new dimension. Instead of just reacting to threats as they come, he could proactively shape events. He could potentially save Camp Half - Blood from destruction long before it even became a threat by going back in time and changing certain factors. And in battles, he could create time - loops to trap his enemies or accelerate time to make his attacks faster and more powerful.
In fanfiction, if Percy Jackson becomes the Titan King, he might completely change the power dynamics in the world. He could use his new position to bring about a new era of peace between the gods and the Titans. After all, Percy has always been a mediator of sorts, and as Titan King, he would have the power to enforce treaties and agreements.
He might become more authoritative. As the Titan King, Percy would have to command respect and make tough decisions. He can't be as carefree as he was before.
Annabeth would definitely be a great ally. Her strategic mind could help Percy navigate the complex situations that come with his Titan heritage. She could also research about Titans and find ways to counter any threats that target Percy because of his parentage.
One common theme is power. Percy often has to come to terms with new powers or limitations in these fanfictions. For example, in many stories, he might gain powers related to the hunt but has to learn how to control them.
In this fanfiction, imagine if Percy Jackson was transported to the Naruto universe during a battle with the Titans. He could use his demigod abilities to help Naruto and his friends against a new threat that has some connection to the Titans. Maybe the Titans' power is being used to create a super - villain in the Naruto world.