Wow. I can't believe you guys are trying to take credit for something you didn't even do... way to ruin your character.
The truth is, we'll never know who the Riddler is, ever! He just proved that we all are the Riddler, in our own ways. We each have a little of the Riddler inside of us, because we all have questions we want answered. However, sometimes the truth isn't good enough. Sometimes our questions should not be answered, because mystery and legends will always remain better than the truth.
Duck-Duck-Sheep: So what do we do now?
We remember; we remember his lessons. We remember the person he showed us we can be.
Duck-Duck-Sheep: Will we ever see him again?

He's already here, sheep... in all of us.
Duck-Duck-Sheep: 