Well, it might signify her uniqueness. In the Twilight universe, Bella is already different as she is the object of Edward's affection and has a special connection to the vampires. Wings could be an added feature that sets her even further apart. It could also be related to some sort of power or ability she gains. Maybe she can use the wings to fly to places quickly, which would be useful in both the human and vampire worlds, especially when she is in danger or needs to reach someone fast.
The wings could be a metaphor for her growth. Bella starts off as a rather ordinary girl in the Twilight story. As she gets involved with the vampires and the supernatural world, she goes through a lot of changes. The wings might represent how she has 'grown' out of her initial self. It could also be a way for the author of the fanfiction to explore different aspects of Bella's character. For example, if she has wings, she might have to learn how to control them, which could be a parallel to how she has to learn to control her new life as part of the vampire world.
In the original Twilight plot, Bella is a normal human who becomes a vampire. With Bella having wings in the fanfiction, it could change the whole dynamic of her relationships. For example, Edward might be more protective of her because of this new and potentially dangerous aspect of her. Also, her interactions with other vampires and werewolves would be different. She could use her wings to escape or attack, which is not something in the original plot.
Well, it could symbolize great power. In many fictional concepts, wings often represent strength, freedom, or a connection to something divine. So Naruto having 12 wings might mean he has an extraordinary level of power, perhaps even a connection to a higher realm or a new form of chakra. It could also be a sign of his evolution as a character, making him stand out even more in the Naruto universe.
One popular 'bella has wings' fanfiction is 'Wings of Destiny'. It explores Bella's new life with wings in a magical world filled with mythical creatures. The story has great character development and an engaging plot.
In many 'bella has wings' fanfictions, the theme of transformation is prevalent. Not just the physical transformation of getting wings, but also an internal transformation. Bella might become more confident, more assertive. There's also the theme of adventure, as she uses her wings to explore new places and have new experiences.
One possibility could be a curse or a blessing from a powerful being. Maybe Naruto encounters a god - like entity during one of his adventures who bestows the angel wings upon him as a way to test his character or give him new powers to face an upcoming threat.
Maybe they could be a result of some ancient curse or blessing. For example, Naruto might have accidentally stumbled upon an old shrine during one of his adventures and unknowingly activated a spell that gave him the black angel wings. It could also be related to his Uzumaki heritage, perhaps there's some hidden power within his bloodline that was awakened in an unexpected way, causing the appearance of these unique wings.
Maybe they could be a result of some forbidden jutsu gone wrong. For example, Naruto might have been experimenting with a new form of chakra manipulation that accidentally summoned some dark energy which manifested as black wings.
There might be a 'bella got wings fanfic' where she discovers the origin of her wings. It could involve her going on a quest to find an ancient wizard who can tell her more about her newfound gift and the responsibilities that come with it.
In fanfics, Bella tossing stones could symbolize her restlessness. She's often in the middle of so much turmoil in the Twilight series, and this simple act might be a way for her to release some pent - up energy or frustration.
One possibility could be a magical encounter. Maybe he stumbles upon a rare and powerful Pokemon or a mystical artifact that bestows him with wings. It could also be a result of some genetic experimentation by a mad scientist in the Pokemon world who targets Ash for an experiment gone wrong (or right, in this case of getting wings).