When Percy is made a god in fanfiction, his personality could shift towards being more authoritative. He has to deal with other gods and manage his own domain. So he might become less impulsive as he now has more at stake. His kindness towards mortals could either increase as he has more power to protect them, or decrease as he becomes more involved in godly affairs. His confidence would likely soar, but it could also turn into arrogance if he's not careful.
His personality might become more reserved. As a Cullen, he'd have to fit into their more subdued lifestyle. He might lose some of his brashness.
His personality would likely experience a shift towards a more solemn and responsible demeanor. With godly powers come great responsibilities. Percy would no longer be able to act as carelessly as he did as a demigod. He might become more reserved in showing his emotions, especially as he realizes that his actions as a god can have far - reaching consequences. Also, his loyalty might be tested as he has to balance his new divine status with his relationships from his mortal days.
He might become more aloof. Being a god often comes with a sense of superiority, but Percy has always been down - to - earth. However, his new status could make him a bit more distant from his mortal friends at first. But deep down, he'd still be the same Percy with a strong sense of right and wrong.
Well, initially, Percy might be really confused about his new personality. He's used to being a scrappy demigod. But as a god, he could become more calculating. He'd have to think about the long - term consequences of his actions more. His loyalty to his friends might be tested as he has to consider the greater good of the world. He might also become more secretive as he has to deal with godly secrets and politics. He would still have his core of kindness, but it might be overshadowed at times by his new godly traits.
He might become more cautious. Since the future is unknown and full of new things, he would have to be careful. For instance, he can't just rush into a fight without knowing what his opponents are capable of.
He might become more patient. Since he has control over time, he would understand the concept of waiting better. For example, he wouldn't be as impulsive as before when facing challenges.
He might become more war - like. Norse gods are often associated with battle, so Percy could lose some of his more laid - back Greek side.
His sense of humor might change. He could become more wry and god - like in his jokes. Also, he might be more decisive, as a god has to make big decisions quickly. However, his love for his friends and family would still be there, just expressed in a different way perhaps, more like a distant protector.
His sense of humor might change. While Percy had a very down - to - earth and sarcastic humor as a mortal, as a god, he might develop a more refined and sometimes cutting sense of humor. He could use it to put other gods in their place or to make a point during a council meeting. Also, he would likely become more confident, bordering on arrogance at times. His new powers and status would give him a boost in self - assurance, but his friends from his mortal days would probably be the ones to keep him in check and remind him not to get too full of himself.
His sense of humor might change. While he was always quick - witted as a demigod, as a god, his humor could become more refined or perhaps more sarcastic in a way that only the other gods would understand. He'd be around different company, and that would influence how he expresses himself. Also, he could become more confident, bordering on arrogant, as he has so much power at his disposal now. But at the same time, his core values of loyalty and protecting the weak might still remain, just expressed in different ways.