Who was nemesis in each of the dark night series?

It's important to note that "Nemesis" is not a recurring character in the Dark Knight trilogy, so there isn't a "Nemesis" in each film. The films each feature a different main antagonist.

Here are the main antagonists in each of the Dark Knight trilogy films:

* Batman Begins (2005): Ra's al Ghul (played by Liam Neeson) is the main antagonist. He is a skilled martial artist, strategist, and leader of the League of Shadows, a secretive organization dedicated to restoring balance to the world through destruction.

* The Dark Knight (2008): The Joker (played by the late Heath Ledger) is the main antagonist. He is a chaotic and unpredictable criminal mastermind who seeks to plunge Gotham City into anarchy and chaos.

* The Dark Knight Rises (2012): Bane (played by Tom Hardy) is the main antagonist. He is a physically imposing and ruthless terrorist who plans to destroy Gotham City and break Batman's spirit.

While the Joker could be seen as a nemesis to Batman in a broader sense, the term "Nemesis" typically implies a recurring opponent or arch-rival. The Dark Knight trilogy doesn't feature such a recurring character.