If he transforms into a Pokémon like Lucario, which is known for its sense of justice and loyalty, his sense of justice could become even more intense. He would be more likely to go to great lengths to protect the innocent and might have an even stronger moral code. His already strong will would be enhanced by Lucario's own noble nature.
If his transformation is linked to a hyper - active Pokémon like Jigglypuff, he could become more light - hearted and fun - loving. He might start using his powers in more creative and comical ways, like using Jigglypuff's Sing move to put minor criminals to sleep instead of just webbing them up.
Well, if Spider - Man turns into a girl, her personality could change in multiple ways. She might become more nurturing. Since society often associates femininity with nurturing qualities, she could start to look out for the well - being of the community in a more hands - on way, like setting up support groups for victims of crime. Her confidence could also be different. She might have to build it up anew as she faces different expectations as a girl. In the male form, confidence might have come from physical strength and the ability to fight, but as a girl, she might find confidence in her intelligence and ability to outwit her opponents. And she could be more collaborative. Instead of the lone - wolf style of the male Spider - Man sometimes, she might seek out other female superheroes or allies to work together more often.
Well, his sense of humor could disappear. Spider Man is known for his quippy remarks, but as Toxin, he may be too focused on his new, darker nature. His sense of justice might also get distorted. Instead of just stopping criminals, he could start to punish them more severely. He may view the world in a more black - and - white way, with less room for redemption for the bad guys. Also, his relationships with other superheroes could change. Some may be afraid of him now, while others may try to bring him back to his old self.
In some fanfictions, Ash becomes more brooding and withdrawn. The shadow Pokémon transformation makes him more cautious as he's aware of the new, potentially dangerous powers his Pokémon possess.
Ash would probably become more patient. Rangers often have to wait and observe Pokémon in their natural habitats. This is different from his Trainer days where he was more focused on quick battles and leveling up his Pokémon. He'd also be more diplomatic, since he'd need to work with other Rangers and people in the Pokémon world who might have different opinions on conservation and Pokémon management.
Ash's personality could shift to be more protective. Lugia is known as a guardian of the seas, and in his transformed state, Ash might feel a stronger sense of responsibility towards other Pokemon and the environment. His competitive streak, which is a big part of his normal personality, could be toned down as he now has much greater power and a different role to play in the Pokemon world. He would also have to deal with the isolation that comes with being such a powerful and different being, which could make him a bit more introverted.
One possible plot could be that Spider - Man gets transported to the Pokémon world. There, he somehow merges with a Pokémon, like Pikachu. He could then use his spider - like abilities along with Pikachu's electric powers to fight villains in the Pokémon world. For example, he could use his web - slinging to move quickly and then zap enemies with Pikachu's thunderbolt.
He could start to bring some lightness to Gotham. His positive attitude might inspire some of the citizens. And his ability to swing around the city quickly could help with emergency rescues.
His relationship with Aunt May would likely become more strained as she becomes overprotective, fearing she could lose him too. With his friends at school, he might become more distant as he is preoccupied with superhero duties. He could also be more cautious around MJ, not wanting to put her in danger in the new, more dangerous world.
His personality might become more reclusive. Since spiders are often solitary creatures, Peter could start to withdraw from his social circle. He might be less likely to engage in his usual banter with his friends at school. Instead, he'd be more focused on his new - found spider instincts, like finding quiet places to rest or being more aware of his surroundings in a way that makes him seem aloof to others.
In a fanfiction about Spider - Man in the DC Universe, his origin story could be affected by the presence of other heroes. Maybe he'd be inspired by Superman's heroics from a young age. And instead of Uncle Ben's death being the sole driving force, it could be a combination of that and seeing the destruction caused by a DC villain. This would give his origin a more complex and multi - faceted motivation.