A powerful dark spirit that feeds on both chakra and the energy of the Green Lantern ring could be the main antagonist. It starts to possess some of the characters in the Naruto world and uses their bodies to attack. Naruto and the Green Lanterns must find a way to exorcise this spirit and prevent it from draining all the power in both universes.
Maybe an alien from the Green Lantern universe who has a vendetta against the Green Lantern Corps decides to target Naruto's world. This alien believes that by causing chaos in the Naruto universe, he can draw out the Green Lanterns and destroy them. He has powerful weapons and abilities that are a challenge for Naruto and his friends to overcome.
Maybe an alien race that the Green Lanterns have underestimated. They see Naruto as an easy target since he's being neglected. But Naruto turns out to be more of a challenge than they thought. This alien race could have some sort of power that nullifies the Green Lantern rings, but Naruto's ninja skills are still effective against them.
It could be a rogue ninja from a hidden village who has a vendetta against the Green Beast. Maybe this antagonist blames the Green Beast for something that happened in the past.
Ruby Rose could be the main character. Her optimistic and fearless nature would make her a great fit for a story involving the Green Lantern. She's always eager to take on new challenges, and if she were to get involved with the Green Lantern's power, she would be quick to try and master it to protect her friends and the world.
In a 'green lantern naruto fanfiction', it could start with Naruto on a solo mission and stumbling upon a crashed Green Lantern ship. He discovers the ring and when he puts it on, he's instantly connected to the Green Lantern Corps. He has to balance his training as a ninja with learning the complex abilities of the ring. He could use his chakra in unique ways in combination with the ring's power to create new and powerful attacks against villains from both universes.
Well, a 'Naruto Green Lantern lemon fanfiction' might be a wild combination. The Naruto world with its ninja powers and the Green Lantern's power ring could create some really interesting scenarios. The 'lemon' aspect could mean that there are some more adult - themed interactions, but if we're avoiding that, it could just be some intense emotional or passionate non - sexual relationships between characters from the two universes. For example, Naruto might team up with a Green Lantern to fight a common enemy and form a deep bond during the process.
Hal Jordan could be the main character. He could be in a mentoring role for the Young Justice members, sharing his experiences as a Green Lantern. His cocky and confident personality would add an interesting dynamic to the story as he tries to teach the younger heroes.
Well, Naruto with a Green Lantern ring could be extremely powerful. His strong willpower, which is a key factor for using the Green Lantern ring, would be amplified. He could create constructs based on his ninja skills and the chakra system. For example, he might form giant rasengan constructs to attack his enemies. Also, his sense of justice, which he already has in the Naruto world, would align well with the Green Lantern Corps' ideals.
Well, if Naruto had a Green Lantern ring, he would be extremely powerful. His already formidable willpower from his ninja training would be amplified by the ring. He could create constructs of his shadow clones, or use the ring's energy to enhance his Rasengan. It would be a whole new level of combat for him, combining the powers of the ninja world with the abilities of the Green Lantern Corps.
In a crossover with Iron Man, Stark could be the main antagonist to the Green Goblin. Tony Stark would see the Goblin as a threat to the safety and order he wants to maintain in the world. He would use his high - tech suits and resources to try and stop the Green Goblin's chaos - causing ways.
It could be someone from the Naruto universe who doesn't like Naruto's newfound fascination with Aku. For example, Danzo might see Naruto's interest in Aku as a threat to the stability of the village and try to stop Naruto from further exploring Aku - related things. So, Danzo could be the main antagonist in this case.