Ned could be the main character in an alternate ending. He could find a way to hack into the Vulture's technology and disable his weapons. For example, while Spider - Man is busy in the physical fight, Ned uses his tech - savvy skills to disrupt the Vulture's flight systems, giving Spider - Man an edge in the battle.
In the context of Spider - Man: Web of Shadows' evil ending fanfiction, one interesting aspect could be the character development. If Spider - Man goes down the evil path, how do the other characters react? For example, Mary Jane might be horrified and try to bring him back to the good side. Also, villains might either team up with this new, evil Spider - Man or see him as a threat to their own plans.
It all starts when Peter Parker gets bitten by a radioactive spider. This gives him amazing powers like super strength, the ability to climb walls, and a 'spider sense'.
One possible plot could be that instead of Peter Parker managing to defeat the Vulture on his own, he gets some unexpected help from an ordinary citizen. This citizen, inspired by Spider - Man's courage, steps in at a crucial moment, distracting the Vulture long enough for Peter to land a final blow. It would show that Spider - Man not only inspires fear in villains but also courage in the common people.
One idea could be a story where Miles Morales has to team up with an alternate version of himself from a dimension where he never became Spider - Man. They have to overcome their differences and learn from each other to stop a new villain that is threatening all the spider - verse.