There are also fanfictions that combine Green Arrow with other popular characters in the Death Battle realm. These crossovers can create really interesting storylines. For instance, if Green Arrow teams up with another hero or has to face off against an unexpected villain. Reading reviews and ratings on fanfiction websites can help you find these great stories.
You can try some fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions, including those related to Green Arrow in the context of Death Battle. Just search for the relevant tags.
Yes, it can be. It often gives enough background within the story so that new readers can follow along. They'll quickly get a sense of who Green Arrow is and what he stands for.
Green Arrow isn't typically portrayed as an asshole. He's often a hero with a strong sense of justice, but like any character, he has his flaws and moments of difficult choices.
Sure, The Flash and Green Arrow are friends. They share common goals and help each other out on many occasions. Their friendship adds depth to the comic universe.