There's a fanfiction called 'Riddles in the Dark' which delves deep into the psychological battle between Batman and the Riddler. It's really engaging as it explores how they outwit each other in different scenarios. It's filled with mystery and suspense, much like the actual Batman comics.
One great 'Batman x Riddler Fanfiction' is 'The Riddler's Redemption'. It shows an interesting take on the Riddler trying to turn over a new leaf and his complex relationship with Batman during that process.
A popular one is 'Batman and the Riddler: An Unlikely Alliance'. In this fanfiction, circumstances force Batman and the Riddler to work together. The author does a great job of showing their clashing personalities while also highlighting how they can complement each other in unexpected ways. This story has a lot of action scenes as well as some really well - written dialogue that keeps the readers hooked.
There's a fanfic called 'Arkham Knight: Riddler's New Game'. This one is really interesting as it puts the Riddler in a situation where he has to team up with Batman, albeit unwillingly, to stop a greater threat in Arkham City. The dynamic between the two is explored in a whole new way, with the Riddler's riddles becoming more of a tool for cooperation rather than just a means of taunting Batman.
One great 'Two Face x Riddler' fanfiction is 'The Duality of Enigma' which delves deep into their complex relationship. It shows how Two Face's split personality interacts with Riddler's need for intellectual challenges. Another interesting one is 'Faces of the Riddle'. It presents a unique take on their bond, with Riddler trying to solve the mystery that is Two Face.
One of the best is 'The War of Jokes and Riddles' arc. It shows the complex relationship between Batman and the Riddler, with the Riddler creating chaos in Gotham as part of a grand plan. The psychological warfare and the clever riddles make it a great read.
A lesser - known but really good 'Batman and Vixen' fanfic is 'The Night's Guardians'. This fanfiction delves into the backstories of both characters and how their pasts have led them to be the heroes they are today. It also has some great action scenes where they fight side - side against a powerful villain.
One great 'Batman and Redhood Fanfiction' is 'Redemption Road'. It delves deep into Redhood's struggle for acceptance from Batman again. The story is full of action and emotional moments as they face common enemies while trying to repair their broken relationship.
I would also recommend 'Detective Comics' issues that feature the Riddler. These often explore his mind - games and his relationship with Batman in a more episodic but engaging way.
The story 'Hush' also has some great Riddler moments. He is involved in the complex web of mystery and deception that unfolds. His riddles are used as tools to both taunt Batman and move his own plans forward. His character is presented as highly intelligent and always a step ahead in terms of his mental games.
One great 'Batman Saves Robin' fanfiction is 'The Dark Knight's Rescue'. It really delves into Batman's determination and the emotional bond between the two. The author does an amazing job of showing Batman's skills as he battles through various villains to reach Robin. Another good one is 'Batman's Swift Save'. It's a shorter piece but has intense action scenes where Batman uses his gadgets to save Robin from a very dangerous situation.
One great 'Batman x Robin Fanfiction' is 'The Dynamic Duo's New Adventure'. It really captures the essence of their relationship, with Batman being the brooding mentor and Robin the eager protege. The story takes them on a journey through Gotham's underbelly, facing new villains and challenges that test their bond.
I really like the fanfic 'Apocalypse's Aftermath'. In this story, the world is in ruins after the events of the Batman Superman Apocalypse. It focuses on how the remaining heroes, including Batman and Superman, are trying to rebuild society while also dealing with the new threats that have emerged from the chaos. It's a very character - driven story.