Ra's al Ghul is a character that would be significant in a batman arrow crossover fanfiction. As a long - standing adversary of Batman and a figure with a large influence in the criminal underworld, his presence could add a lot of depth to the story. He might be involved in a plot that spans both Gotham and Star City, pulling the strings from behind the scenes. Additionally, Black Canary from Arrow could be important. Her martial arts skills and sonic scream ability would make her a formidable ally in a fight against the combined threats that a crossover would bring.
Alfred Pennyworth could be included. He could offer his wisdom and support to both heroes. Maybe he even has some insights about the similarities and differences between Gotham and Starling City. Another character could be Felicity Smoak. She could help with the tech - related aspects of the case they are working on together.
Neville could play an interesting role. Maybe he could be the one who discovers a new magical plant that is needed for a potion to cure an illness that Ginny or Harry contracts during their marriage. Luna could also be involved. She might come to them with some strange but useful prophecies that help them in a difficult situation, like dealing with a dark wizard who has a grudge against Harry even after the war is over.
Sasuke could also be important. He might be initially skeptical of Naruto's Sage Chakra but later see its potential and even collaborate with Naruto. Also, the Great Toad Sage is a key character. It could give Naruto new prophecies related to his Sage Chakra, leading him to new adventures and challenges. Tsunade could also play a role, perhaps in helping Naruto understand the medical aspects of Sage Chakra and how it affects his body.
Hermione would definitely be important. She could use her extensive knowledge to help Harry understand his creature inheritance. For example, she might research ancient texts to find out more about the origin of his inherited traits.
Sasuke could play an important role. In different universes, he might have different allegiances or powers. For example, in a universe where the Uchiha clan was never massacred, Sasuke could be a powerful leader. Kakashi is also a great candidate. His knowledge and skills could be very useful in strange universes. And Jiraiya, he could be the one guiding Naruto through the different universes, sharing his wisdom about the various changes and how to adapt.
Sakura could play an important role. She might be more concerned about Naruto's well - being after such a tough fight. She could also use her medical skills to help in the rebuilding of Konoha. Kakashi, too, could be significant. He could guide Naruto in understanding his new powers better and also contribute to the village's security plans.
Sakura could have a different relationship with Naruto in this fanfiction. Since Tsunade trained her, there could be more of a family - like bond between Sakura and Naruto. Also, characters like Sasuke would still be relevant. His rivalry with Naruto could be affected by Naruto's new family situation. Additionally, Shizune, Tsunade's assistant, could be involved, perhaps acting as an older sister figure to Naruto.
One great storyline could be where Arrow and Batman team up to take on a common enemy like Ra's al Ghul. Arrow's skills with the bow and his street - level fighting ability combined with Batman's detective skills and high - tech gadgets would make for an exciting adventure. They could start off as rivals, not fully trusting each other, but as they face the challenges set by Ra's, they learn to work together and respect each other's methods.
One idea could be Batman coming to Star City to help Arrow deal with a new, extremely dangerous criminal organization that has ties to Gotham. This could lead to some great fight scenes as they combine their skills and resources.
Obviously, Dawn and the members of Team Rocket like Jessie, James, and Meowth are the main ones. But there could also be Dawn's Pokémon, like Piplup, which might try to rescue her. And there could be other Pokémon trainers or characters from the Pokémon world who might get involved in the rescue mission.