Another plot could be that Blackfire comes to Earth seeking refuge from some intergalactic trouble. Robin is the one assigned to protect her. At first, Blackfire resents the protection, but as time passes, she realizes Robin's good intentions and they form an unexpected bond. Their adventures on Earth, with Robin showing Blackfire the beauty and uniqueness of the planet, could be really engaging.
Another plot could involve a power exchange. Blackfire's technology-based powers somehow interact with Naruto's chakra, and they have to figure out how to control this new combined power. They might start training together, with Naruto teaching Blackfire about chakra control and she teaching him about advanced alien combat strategies.
One idea could be that Danny and Blackfire meet during a space - time rift accident. Danny is on a mission to close the rift when he encounters Blackfire, who is escaping from some intergalactic bounty hunters. They have to team up to fend off the hunters and in the process, learn about each other's powers and worlds.
One idea could be a story where Robin is caught in the middle of a rivalry between Starfire and Blackfire, and there are some 'lemon' - like tense and passionate moments. For example, Blackfire might try to win Robin over just to spite Starfire, leading to some very emotional and charged scenes.
A really interesting plot could be that there is a prophecy on their home planet that only Starfire and Blackfire together can fulfill. It involves finding a lost relic that has the power to save their planet from a looming disaster. As they search for the relic, they face many challenges that test their relationship and force them to rely on each other's strengths.
I'm not sure specifically about 'robin and blackfire lemon fanfiction' as it might involve adult - oriented scenarios which are not suitable for general discussion. But if you just want to read about Robin and Blackfire's interactions, you can try some mainstream fanfiction sites. Some stories might focus on their adventures together, or how they deal with each other in different situations, like facing a common enemy or working towards a shared goal.
One idea could be to have Batman and Robin face a villain who has the power to manipulate time. They would have to figure out how to stop the villain from changing history. Another could be that Robin gets kidnapped by a new, never - before - seen criminal and Batman has to use all his detective skills to find him. Maybe a third idea is that a powerful alien lands in Gotham and Batman and Robin have to team up with other heroes to deal with it.
Perhaps Robin's red color is a sign of his being chosen by a secret order. He then embarks on a journey to learn the ways of this order, facing various challenges and making new allies along the way. In the fanfiction, his red attire could hold special significance within the order's lore.
One idea could be a time - travel plot where Robin from the present meets a younger Lucina. They could initially be at odds due to their different understandings of the future and past events. But as they spend time together, they start to understand each other and develop feelings. Another plot could be set during a war where they have to fight side by side and rely on each other's skills. This shared experience could bring them closer. A third idea is a story where they meet in a peaceful village and help the villagers together. Through their acts of kindness, they fall in love.
One common theme is the clash of different cultures. Robin is from Earth and Blackfire is from another planet, so their cultural differences often play a big role. Another theme is the idea of forbidden love, as they are often on opposite sides at first. For example, Blackfire has been an antagonist in some cases.
One idea could be that Robin discovers a dark secret about Batman's past that makes him question their relationship, leading to a tense confrontation. For example, if Robin finds out that Batman once made a deal with a villain that had far - reaching consequences. Another plot could involve a new villain manipulating Robin into believing Batman is a threat to Gotham, causing them to fight. Maybe the villain uses mind - control technology.