Perhaps when they combine, Spider - Man gets the ability to fly due to Captain Universe's power. He could also have a sort of cosmic - awareness, being able to sense threats from across the universe. This would make him an even more formidable hero, able to protect not just his city but also have a role in the greater cosmic balance.
Obviously, Spider - Man is one of the main characters. He's the one who gets the Captain Universe powers. And Mary Jane Watson might also be a main character as she's an important part of Spider - Man's life. Another could be J. Jonah Jameson, who always has an interesting take on Spider - Man's activities, especially when he becomes this more powerful version.
One interesting aspect could be the unique powers Spider - Man gains as Captain Universe. It makes for really cool action scenes. For example, his strength and agility could be enhanced to an even greater degree than his normal powers. Another aspect is how his character might change in the fanfic. Maybe he becomes more self - assured or takes on more global - scale threats.
Another way their powers could combine is in the area of mobility. Spider - Man can move quickly through the city, but Elsa can create ice bridges and paths that can cross large gaps or even over water. So, if they were on a mission together, they could use these combined abilities to get to places faster. For example, if they were chasing a villain who escaped to an island, Elsa could freeze a path across the water and Spider - Man could swing them both along the path at high speed.
Their powers could combine in a way that Naruto's chakra enhances Spider - Man 2099's physical abilities. For example, his strength and speed could be increased even more. Also, Spider - Man 2099 could use Naruto's shadow clone technique to create multiple copies of himself to confuse enemies while swinging around on his webs.
Well, Spider Man's ability to sense danger and his super - agility would be great for getting into and out of tight spots. Valkyrie's strength and her enchanted sword could be used for direct combat. In a story, they could combine their powers like when facing a horde of enemies. Spider Man could web up some of the foes, and Valkyrie could then easily dispatch them with her sword. Also, Spider Man could use his webs to create distractions while Valkyrie sneaks up on the main villain.
Loki's illusions combined with Spider - Man's acrobatic skills would be a great combination. Spider - Man could move within Loki's illusions, confusing their enemies even more. And if Loki were to use his telekinesis to move objects, Spider - Man could use his webs to direct those objects towards their enemies. Also, Spider - Man's ability to stick to walls could be used in Loki's lairs or magical structures, allowing him to navigate them more easily while Loki uses his magic to deal with any traps or guards.
The Captain Universe Spider-Man comic ties into the broader Spider-Man universe in various ways. It might share characters, themes, or references with other comics, but it also brings its own fresh perspectives and plot developments.
Maybe in the fanfic, Captain Universe's power has a mind of its own and it tries to take over Spider - Man. Spider - Man then has to fight against this internal struggle as well as external threats. This could lead to some really intense character - development moments.
Captain America's strategic mind and leadership skills could play a big role in combining their powers. He could come up with plans that utilize both of their shields effectively. The Shield Hero's ability to adapt his shield powers could be paired with Captain America's physical prowess. For instance, if the Shield Hero creates a shield with a fire - based power, Captain America could use his strength to throw it with more force and accuracy, creating a more devastating attack. Also, their combined auras of heroism could have an intangible effect on the battlefield, inspiring their allies to fight harder and potentially unlocking hidden powers within themselves.
Some fanfictions focus on the origin of Captain Universe Spider - Man. They might explore how Peter Parker gets chosen to be the host of the Captain Universe power. It could be a story full of mystery and unexpected events, like a hidden prophecy or a special connection between Peter and the cosmic forces that leads to him obtaining these powers.