Well, a really cool plot might be that baby robin accidentally stumbles upon an old enemy of batman's, who doesn't realize he's just a baby. Batman then has to use all his wits to protect baby robin without the enemy finding out his true identity. Also, there could be a story where baby robin befriends an unlikely animal in the Batcave, and batman has to figure out how to handle this new situation. Maybe baby robin starts to show signs of being a tech genius at a very young age, and batman begins to train him in that aspect early on.
One idea could be Batman teaching Baby Robin the basics of detective work. For example, showing him how to analyze crime scenes for clues. Another could be a story where they face a villain who specifically targets Robin because he's young and inexperienced. A third idea might be a heartwarming tale of Batman protecting Robin during a city - wide disaster.
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.
Well, you could have a story where the Bat - family faces a crisis that makes them question their purpose. Robin might start to doubt if he should continue in this life. The family then has to work together to reaffirm their values. It could also be interesting to see a story where an old enemy returns, but this time targets the emotional weaknesses within the Bat - family.
In some 'batman fights robin fanfiction', there might be an external factor like an ancient curse that affects Robin. He becomes aggressive and unpredictable, forcing Batman to fight him. This could also be related to a prophecy that Robin is supposed to bring chaos, and Batman is trying to prevent it. Batman would be conflicted as he doesn't want to harm Robin but also needs to stop the potential danger.
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.
One idea could be that Batman becomes overly protective of Robin in the face of a new and dangerous villain in Gotham. He starts to limit Robin's activities more than usual, which causes tension between them. Robin might feel stifled and try to prove himself independently.
One idea could be Robin trying to prove himself to Batman in a mission within the Young Justice framework. Maybe there's a new villain in town that only they can stop together.
One plot idea could be that Batman discovers Baby Superboy and has to protect him from villains who want to use the baby's powers for evil. Maybe Batman has to figure out how to care for a super - powered baby while also keeping him safe.
In a fanfiction, Robin could be injured in a trap set by an old enemy of Batman. This enemy specifically targeted Robin to get back at Batman. Batman, upon finding Robin injured, is consumed with guilt and anger. He goes on a full - scale investigation to find the enemy. Meanwhile, Robin is in a critical condition and Alfred has to use all his medical knowledge to keep Robin alive. The story could focus on Batman's internal struggle between his need for revenge and his responsibility to Robin, and how he overcomes this to save both Robin and Gotham.
In the fanfiction, the baby could have some unique abilities inherited from both Zoro and Robin. For example, it could have Zoro's sense of direction in combat and Robin's ability to read ancient texts. This could lead to many interesting adventures as the crew tries to understand and help the baby develop these powers.