One possible plot could be that they team up to stop a powerful alien threat that is beyond what Supergirl can handle alone. Batman's strategic mind would be crucial in devising a plan to take down this foe. Maybe they have to find a way to combine Supergirl's superpowers with Batman's gadgets and combat skills.
Well, their team - up would be amazing. Spider - Man's acrobatic skills and web - slinging along with Supergirl's super strength and flight could make for some really cool action scenes. They could fight villains that neither could handle alone. For example, a powerful alien who can resist Spider - Man's physical attacks but is vulnerable to Supergirl's heat vision, and at the same time, Supergirl might need Spider - Man's quick thinking and agility to deal with the villain's minions.
Supergirl is generally more optimistic and believes in the good in people. Batman, on the other hand, has seen the worst of humanity and is often cynical. This could lead to some clashes. But it can also be a great complement. Supergirl's optimism can help Batman see the better side of things sometimes. And Batman's caution can prevent Supergirl from making hasty decisions. In a fanfiction, we could see this play out when they are dealing with a villain who claims to have reformed. Supergirl might be inclined to believe them, while Batman would be looking for signs of deception.
One alternative could be focusing on her heroic deeds. For example, writing about how she saves the city from a powerful villain. This would showcase her strength and courage.
In a 'Team Flash meets Supergirl' fanfiction, there could be an epic team - up. The Flash might use his super speed to save Supergirl from a kryptonite - powered trap. Then they could join forces to fight a common enemy like Lex Luthor or an alien invasion. The scientific minds in Team Flash could also help Supergirl understand some new aspects of her powers.
One interesting crossover could be the characters teaming up to fight a common supervillain. For example, Lex Luthor from Supergirl's world could team up with some of Arrow's villains like Deathstroke, and Team Arrow and Supergirl would have to combine their skills to take them down.
Kara Danvers (Supergirl) is also very popular. Her superpowers and kind - hearted nature make her a central figure. Fans love to see her interact with the more grounded characters from Arrow, like when she tries to understand their more human problems despite her god - like powers.
Well, 'cw crossover fanfiction' is basically fan - made literature. Fans of CW shows like to mix things up. They might take the vampires from 'The Vampire Diaries' and make them interact with the superheroes in 'Black Lightning'. It's all about having fun with the existing CW universes and coming up with unique combinations.
Well, Supergirl is used to being a solo hero or working with Superman. But with the Young Justice team, she'd bring in her Kryptonian strength and knowledge. The team members of Young Justice would be in awe of her powers at first. But they also have their own unique skills. For example, Robin is a great detective. He could help Supergirl in figuring out the motives of villains more quickly. Superboy, being a clone of Superman, might have an interesting relationship with Supergirl. They could compare their experiences of being related to Superman in different ways. Aqualad's leadership skills could also play a role in making sure Supergirl fits into the team's strategies well.
Supergirl would be really interesting. Her alien origin and her super strength, along with her ability to fly, would make her stand out. She could bring a new dynamic to Team Flash with her different set of powers and her more idealistic view of heroism, which might contrast with some of the more street - level concerns of Team Flash.