One idea could be that the Witchblade somehow ends up in Gotham City. Batman initially suspects it to be a new weapon in the hands of some villain. But as he investigates, he discovers the unique power and origin of the Witchblade. Maybe the Witchblade chooses Batman as its wielder for a short time to fight against a powerful supernatural threat that Gotham has never faced before.
A more complex plot could be set in an alternate universe where the Witchblade has always been a part of Gotham's history. Batman's family has a connection to it, perhaps his mother was a previous wielder. When a new threat emerges that can only be defeated by the combined power of Batman's detective skills and the Witchblade, he has to uncover the secrets of his family's past to fully utilize the power of the Witchblade.
One idea could be that Robin gets trapped in an alternate dimension where the villains are in control and Batman has to figure out a way to bring him back. Another could be a story where Batman is injured and Robin has to take on a major villain alone, learning to trust his own instincts more. Maybe a plot where they encounter a new, powerful ally who turns out to have a hidden agenda that threatens Gotham.
One idea could be that Batman and Supergirl team up to stop a powerful alien threat that is beyond the capabilities of either of them alone. They start off distrusting each other due to their different methods, but as they face challenges, they learn to work together and respect one another's skills.
A plot could involve Batman investigating a mystery that has ties to Themiscyra. For example, some ancient artifacts from Themiscyra are showing up in Gotham's black market. As he delves deeper, he discovers a connection to a long - lost Amazonian prophecy. Or perhaps there's a character from Themiscyra who has come to Gotham seeking Batman's help to save her homeland from an internal power struggle.
One idea could be a story where Batman and his dad work together to solve a mystery that has haunted the Wayne family for generations. They could use their combined intellect and skills to uncover secrets.
One plot idea could be them teaming up against a new and powerful villain that neither of them can defeat alone. They have to learn to trust and rely on each other's skills in a more in - depth way.
One idea could be a story where Batman has to lead the Justice League in a fight against a powerful new villain who can manipulate time. This would put Batman's strategic skills to the ultimate test as he tries to coordinate the different powers of the League members. Another plot could be that a member of the Justice League is secretly under mind control and Batman has to figure out who it is before they cause too much damage.
A possible plot is that the Tyger Tyger fanfic could be set in an alternate Gotham where the Tyger represents a symbol of chaos. Batman has to figure out how to stop a cult that worships the Tyger and is causing mayhem in the city. He could start having strange dreams related to the Tyger, which could be a sign of some deeper mystery or connection. Maybe there's a prophecy that involves the Tyger and Batman has to either prevent or fulfill it to save Gotham.
Maybe in a fanfic, there's a magical villain who curses Batman and Robin to be overly ticklish for a day. This forces them to rely on their other skills like detective work and stealth while dealing with this strange affliction. They might also have to ask for help from their allies, leading to some really funny interactions.
One idea could be exploring Robin's struggle to live up to Batman's legacy in the Batman Beyond era. Maybe he has to face a new villain who is specifically targeting the new Batman and Robin duo because of their connection to the old heroes. Another plot could involve Robin discovering a long - lost technology from the original Batman's days that holds the key to stopping a major threat to the future Gotham.
Perhaps Batman has teamed up with some of Superman's other foes who have knowledge of his weaknesses. For example, Lex Luthor could provide Batman with technology or information that gives him the edge. Also, Batman might use psychological warfare on Superman, playing on his insecurities about being an alien among humans.