Well, Spiderman's ability to stick to surfaces can be useful in situations where Power Girl needs to land or perch quickly during a fight. Her heat vision (if she has it in the fanfiction) combined with Spiderman's webs could create some really interesting weapon - like constructs. They could also use their powers in tandem for rescue operations, with Spiderman swinging in and Power Girl using her strength to lift heavy debris.
Spiderman's agility and web - slinging could be used to quickly move Power Girl around in battle, getting her to strategic positions. Her super strength could then be used to deliver powerful blows to enemies that Spiderman has trapped with his webs.
Well, Danny can go intangible, which means he could pass through solid objects. Spiderman could use this to his advantage. For example, if they are in a building surrounded by bad guys, Danny could phase through the walls and open doors from the inside for Spiderman to enter unnoticed. Also, Danny's flight ability combined with Spiderman's web - slinging could create a very unique form of transportation for them. They could quickly move across the city, with Danny flying and Spiderman swinging from Danny's body using his webs.
Spider - Man's spider - sense could be a great asset when combined with Arrow's combat skills. The spider - sense could alert them both to incoming danger, allowing Arrow to prepare his next shot while Spider - Man positions himself for an attack. Also, Spider - Man's strength could be used to carry Arrow to higher vantage points for better shooting positions, or to quickly move him out of harm's way during a battle.
Hope can replicate and enhance mutant powers. If she were to enhance Spider - Man's spider - sense, it could make him even more effective in combat. In return, Spider - Man's ability to traverse the city quickly could help them reach places where Hope needs to use her powers more effectively, like in a large - scale battle where she needs to be in the right position to use her powers to the fullest.
Ladybug's power of creation with the Lucky Charm and Iron Man's power of invention through his technology could be combined in amazing ways. For instance, Ladybug could create an object with her Lucky Charm that Iron Man could then modify and enhance with his tech. Maybe she creates a key - like object and he turns it into a high - tech key that can open any lock in the universe.
Spider - Man's power of wall - crawling could be useful in situations where Laura Kinney needs to get to a high place quickly. He could climb up a building and then use his web - slinging to pull her up. In combat, Laura's claws could be used to cut through things that Spider - Man's webs might not be able to stop, like thick metal or strong cables.
If Spiderman got new powers like super strength on top of his existing ones, he'd be able to take on much tougher foes. He could lift heavier objects to use as weapons or barriers. This would change his fighting style as he'd be more of a brute - force fighter in addition to his acrobatic skills.
In this fanfiction, Rogue's power to absorb the powers and memories of others and Spiderman's spider - like abilities could create some interesting scenarios. If Rogue absorbs Spiderman's powers, she might be able to use his spider - sense in a more instinctual way than he does. On the other hand, Spiderman could learn from Rogue how to better control his powers when she has absorbed some of his essence. Their powers could also be used in combat in a more coordinated way, like Spiderman creating webs for Rogue to swing on while she uses her absorbed strength to take down enemies.
Percy's power over water could be used in many ways. For example, he could create water barriers or use water currents to carry them quickly. Jason's control over the wind can complement this. He could use the wind to direct Percy's water attacks or create updrafts to help them reach high places. Nico's underworld powers are also useful. He could summon the dead to gather information or use the shadows for quick escapes. Together, they can create a very versatile and powerful team.
Well, if we consider a character like Todoroki having Ghost Rider powers on top of his own. His ice and fire powers could interact with the hellfire of Ghost Rider. Maybe his ice could be used to temporarily cool down the intense flames of Ghost Rider for strategic purposes, like creating a smokescreen or freezing enemies in place before hitting them with the full force of the Ghost Rider's vengeance. And his fire side could merge with the Ghost Rider fire to create an even more powerful and unique attack.
Lucina's combat skills and swordsmanship could be combined with Spiderman's acrobatic fighting style. They could perform coordinated attacks where Spiderman uses his speed and agility to distract enemies while Lucina strikes with her sword. Their combined power would be a formidable force against any foe.