Batman would probably be very observant. He'd quickly assess the situation, looking for any signs of danger or foul play. If the ice thaw was causing problems in the Frozen world, he'd start formulating a plan to deal with it.
One possibility could be that Batman somehow ends up in the Frozen universe where there is an ice thaw. Maybe he uses his detective skills to figure out the cause, like if it's due to some dark magic gone wrong or a new villain's plot. He could team up with Elsa and Anna to stop whatever is causing the abnormal thaw and save the kingdom.
In this fanfic, perhaps Mr. Freeze's ice - making abilities have gotten out of control, and Batman has to race against time to thaw the ice before it causes a global catastrophe. He might enlist the help of other DC heroes.
Batman could use his intelligence to develop a heat - based weapon specifically designed to thaw Mr. Freeze's ice. He would then have to find a way to use it without harming any civilians trapped in the ice.
In a possible fanfic scenario, Batman could use his high - tech gadgets to thaw Mr. Freeze's shivering ice. Maybe he has a special heat - emitting device that can gradually melt the ice without causing any harm to Mr. Freeze. This would require Batman to be very precise in his actions, as Mr. Freeze's condition is quite delicate.
In a fanfic, the shivering ice might thaw if Mr. Freeze has a change of heart. He could decide to cooperate with Batman and use his own knowledge of his condition to find a solution. Together, they could develop a technology or treatment that gradually warms up his body and thaws the ice. This would be a big shift in their relationship and could lead to many interesting storylines.
Love for the fandom can also thaw frozen fanfiction. If a writer is part of a passionate and supportive fandom, the positive energy from the community can reignite their love for their own fanfiction. They might get inspired by discussions, fan art, or other fanfictions within the fandom. Also, if they love the idea of contributing to the overall body of work in the fandom, it can give them the push to unfreeze their own piece.
Well, 'love will thaw frozen fanfiction' might imply that in the context of fanfiction, which is often full of passion and creativity, love (could be love for the source material, for other fans, etc.) can break through any barriers or 'freezing' factors that are preventing the fanfiction from progressing. For example, if a writer has writer's block due to some negative feedback or lack of inspiration, love for the story can melt that away and get the creative juices flowing again.
Batman would be heartbroken. He has trained Robin and sees him as a partner and almost like a son. He would first try to talk to Robin, to find out what made him turn evil. He would hope that he could reason with Robin and bring him back to the good side.
Some characters might be critical. Elsa, being a powerful and responsible character, might not like it if the fanfiction misrepresents her in a way that goes against her values. She might think that the writers should be more respectful of her character arc and not make her do things that are completely out of character just for the sake of a wild story. However, at the same time, she might also appreciate the creativity in some parts.
The Justice League as a whole would have a diverse range of reactions. Some members like the Flash would be all for it, seeing it as a fun exploration of Batman. Others like Wonder Woman might use it as a way to understand how the public perceives Batman's role in the League. And then there are those like Aquaman who might just shrug it off unless it directly affects his interests. The fanfiction could also potentially create some internal discussions within the League about how they are all portrayed in the public's imagination.