A really effective way to combine their powers would be in a battle against a magical enemy. Wonder Woman has some experience with magic due to her Amazonian heritage. She could guide Power Girl on how to resist the enemy's magic attacks. Then, Power Girl's raw physical power can be used to physically confront the magical foe while Wonder Woman uses her magical weapons like the Bracelets of Submission to deflect and counter the enemy's spells.
Their powers can be combined by having Power Girl use her flight to quickly transport Wonder Woman to different battle locations. Then, Wonder Woman can use her Lasso of Truth to immobilize enemies while Power Girl uses her super - strength to deal heavy blows.
To combine their powers effectively, consider a scenario where Static creates a large electrical field. Wonder Woman then uses her bracelets to reflect and direct the electrical energy in a concentrated beam towards their foes. This way, Static provides the raw power source, and Wonder Woman shapes and aims it for maximum impact. Another way could be that Wonder Woman throws her shield into a group of enemies, and Static then sends an electrical charge through the air to the shield, electrocuting those in contact with it.
In a more complex combination, Wonder Woman's connection to the gods could give Spiderman a temporary boost in his powers. Maybe she calls on a god to enhance his spider - sense so that it can detect threats from other dimensions, which would be useful when they face a villain who has the ability to open portals to different realms.
Their powers can be combined by having Wonder Woman use her bracelets to deflect the Hulk's punches and redirect that energy towards their enemies. For example, if they are fighting a group of powerful robots, she could send the Hulk's force back at the robots with enhanced precision.
In fanfiction, a really cool way to combine their powers would be on a more energy - based level. Iron Man's suit runs on various energy sources. Wonder Woman's powers are somewhat related to a more magical or divine energy. Maybe they could find a way to merge these two types of energy. For example, Iron Man could create a device that channels Wonder Woman's divine energy into his suit, giving it an extra boost. This could also lead to some new abilities for both of them. For instance, Wonder Woman might be able to fly for a short time using the technology - enhanced divine energy, and Iron Man's suit could gain some of the indestructibility that comes with Wonder Woman's powers.
The child could have the power of chakra manipulation from Naruto and the super strength of Wonder Woman. So, it could use chakra - enhanced punches like how Naruto uses chakra in his attacks, but with the raw power of Wonder Woman. Also, it might be able to use the Sharingan - like abilities (if there's some kind of genetic cross - over) along with Wonder Woman's ability to fly. Just think about a character who can create shadow clones and then fly up to take on enemies from above with super strength.
The simplest way could be through a power - up item. For example, Naruto could find a special Power Rangers - like device that allows him to use their powers in addition to his ninja skills. Maybe it's a bracelet or a sword that channels the energy of the Power Rangers' Megazords. In this way, his harem of female characters from both universes could also be involved in the process of unlocking or enhancing these combined powers.
Flash's speed allows him to be in places quickly. So, in a fanfiction, he could be the first to reach Wonder Woman when she's in trouble and his speed - enhanced kiss could give her a boost of energy. Wonder Woman's powers of flight and super - strength can make their encounters more exciting. She could fly them to a secluded place for a romantic kiss. Also, her Amazonian wisdom might make her hesitant about a relationship with Flash at first, which can create tension in the story as his impulsive nature (due to his speed) clashes with her more measured approach.
Wonder Woman could find that a lemon is the key to opening a mysterious portal. She has to journey through this portal which leads to a strange world full of lemon - based creatures. These creatures initially see her as a threat but she has to use her charm and strength to befriend them and solve the problems in their world.
Their different powers can be explored in a battle scene. Wonder Woman has her super strength, speed, and the Lasso of Truth. Batman could use his grappling hook and various high - tech gadgets. In a story, they could be facing an enemy that requires both of their skills. Say, an enemy that is immune to physical attacks unless Batman can find its weak spot using his detective work, and Wonder Woman has to hold it off in the meantime. Their personalities also play a role. Batman's cautiousness might annoy Wonder Woman at times, but she'll come to appreciate it, and his respect for her power will grow as he sees her in action.
One interesting storyline could be a team - up against a powerful new villain who is threatening both their worlds. They combine their unique powers, like Power Girl's super - strength and flight with Wonder Woman's combat skills and Lasso of Truth, to take on the baddie.