Harry Potter would grow in different aspects. He'd gain more knowledge about the spiritual realm. His Gryffindor bravery would be put to the test in a whole new context. He might become more solitary as exorcist work can be isolating. But at the same time, he could form new alliances with those in the exorcist community. His experiences would make him more empathetic towards those haunted by spirits.
If Harry becomes a banshee in fanfiction, his character would experience a huge transformation. He would have to learn patience as banshee powers are not something he can control immediately. His self - discovery journey would be different. He might find new aspects of magic that he didn't know before. His relationships with Dumbledore's memory and the ghosts in Hogwarts could also change. He could communicate with them in a different way, perhaps getting more insights into the afterlife and the secrets of Hogwarts. This would all contribute to a more complex and evolved version of Harry's character.
If Harry becomes a Phoenix in fanfiction, his character development would be really interesting. He would gain a sense of mystery. People would be in awe of him. He might become more patient, like how Phoenixes are patient in their long lives. He would also have to deal with the loneliness that might come with being a unique creature in the wizarding world.
His character would become more complex. He'd have to struggle with his newfound thirst for blood, which could make him more brooding. He might become more isolated as he tries to hide his vampiric side from his friends. His sense of right and wrong would be challenged as he has to deal with the darker aspects of his new existence.
His character would likely become more calculating. Instead of the impulsive Gryffindor actions, he'd think things through more carefully. For example, when facing challenges like the Triwizard Tournament, he might use his Slytherin traits to find loopholes in the rules rather than just charging in bravely.
If Harry Potter becomes a mercenary in fanfiction, his character would develop in several ways. Firstly, he would become more adaptable. In the mercenary world, he'd encounter different cultures, magic systems, and people. He'd have to quickly adjust to new situations. Secondly, he'd become more calculating. Instead of relying on his gut instincts like he did in his battles against Voldemort, he'd need to plan and strategize more carefully. His experiences as a mercenary would also harden him emotionally. He'd see a lot of death and destruction, which would change his once - innocent view of the world. However, deep down, his core of kindness and justice might still be there, just buried under the tough exterior he'd need to survive as a mercenary.
His character would likely become more patient. Since he has all the time in the world, he won't be in a rush to make decisions. He could become a great philosopher of magic, spending years thinking about the deeper meaning of spells and magical abilities.
He'd become more withdrawn. His usual confidence would be shaken. Instead of being the bold Gryffindor, he'd be more cautious. He might question his place at Hogwarts and in the wizarding world.
If Harry Potter becomes a Greek god in fanfiction, his character would experience a radical transformation. His humility might be tested as he gains such great power. He could become more of a leader, using his powers to guide not just his wizard friends but also those in the realm of Greek gods. His moral compass might shift as he has to navigate the complex and often amoral world of the Greek gods. He would have to balance his wizarding values with the new values of the godly realm. His relationships would also be in flux. Some friends might envy his new status, while others might be afraid of him. His journey would be about finding himself anew in this strange and powerful new identity.
If Harry Potter were to become a vampire in a Twilight fanfiction, his character development would be quite a journey. Initially, he'd be in shock and confusion about his new state. As he starts to understand the implications, he'd have to learn to live with the constant thirst for blood. This could make him more empathetic towards creatures that are shunned in the wizarding world, like werewolves. His relationships would also shape his character. For example, if he has a romantic relationship with a vampire or a human, it would force him to reevaluate his values. He might become more protective and secretive, but also more in touch with his primal instincts, which would be a whole new side of his character.
If Harry becomes a house - elf, his character would develop in a way that he becomes more resourceful within the constraints of a house - elf's life. He would have to use his wits to get things done because house - elves have limited magic compared to wizards. Also, his sense of justice would be even stronger. He would be constantly looking for ways to break the chains of the traditional house - elf servitude, maybe by finding loopholes in the ancient laws that bind them.