In fanfiction, Spider - Man could gain the power of teleportation. This would allow him to quickly move around the city and reach crime scenes faster. He might also develop the power of super strength in his legs, enabling him to jump much higher and farther than before. Additionally, the power to manipulate time, even if just for a few seconds, could be a great addition.
Well, he could be given the power of elemental control. For example, being able to summon and control fire, water, earth or air. This would make his combat abilities more diverse. He could also have the power of flight, not just swinging from webs. And perhaps a healing factor, so that he can recover from injuries much quicker and continue fighting crime.
One possible new power could be energy projection. He could shoot out webs of energy instead of just the physical webs. This would not only enhance his offensive capabilities but also give him a new way to interact with his surroundings and immobilize foes from a distance.
He could develop the ability to combine his chakra with his Spider - Man powers. For example, he could infuse his webs with chakra to make them stronger or even give them different properties like being able to cut through objects. Another new ability could be using his shadow clones in combination with his Spider - Man agility. He could send clones to different locations while swinging around with his webs, creating a more complex battle strategy.
Some fanfictions give Spider - Man the power to heal himself much faster. This means that even after a really tough fight, he can get back on his feet in no time. In addition, he might have the power to fly using his webs in a more efficient way, like creating a sort of web - glider that can carry him long distances. There could also be a power where he can project his thoughts into the minds of others, which would be useful for both communication and misdirection.
One new ability could be the power to heal quickly like some mutants. This would make him even more resilient in battles. He could also have the power to sense danger from a much greater distance. And perhaps he could have the ability to fly, not just by swinging on webs but by using some sort of mutant - based flight power. This would change the way he moves around the city and approaches crime - fighting.
A new power they could develop is the ability to create energy shields. Spider - Man's bio - electricity and Venom's symbiotic matter could combine to form a protective shield around them. This shield could not only protect them from physical attacks but also from energy - based attacks. It would be a great addition to their arsenal when facing powerful foes in the fanfiction.
One reason could be a powerful magic spell cast on him by a villain. For example, a sorcerer who wants to stop Spider - Man from interfering in his evil plans might use a spell that disrupts the source of his powers. Another possibility is that he gets exposed to some sort of radiation or chemical that nullifies the mutation that gives him his powers. Maybe he enters a new dimension where the laws of physics are different and his powers don't work there.
Spider - Man's agility and web - slinging could be combined with Superman's flight. For example, Spider - Man could use his webs to attach to Superman while he's flying, allowing them to reach places faster. Or Batman could use Spider - Man's web - shooters in his utility belt for a new way to immobilize enemies. Flash and Spider - Man could work together to create a super - fast web - trap for villains.
In some fanfictions, Spider - Man might gain the ability to teleport across the cosmos. This could lead to him exploring different galaxies and encountering alien species that are both friendly and hostile. He could use his spider - sense in new ways, like detecting threats from across the universe.
A young street - smart kid from the Vegas slums who befriends Spider - Man and helps him navigate the seedy parts of the city that he's not familiar with. This kid could have dreams of leaving the slums and Spider - Man becomes an inspiration for him.
Well, in SI fanfics about Spider - Man powers, often we see the exploration of his spider - sense. It could be made more acute or perhaps have some new features added. And his web - slinging is another cool power. Some fanfictions might have him create new types of webs with different properties, like electrically charged webs for combatting enemies.