need help with this riddle

This is a difficult conundrum. You may think it's straight forward but it's not. Robin hood is a good man, and if you try to catch him, you will fail. Dark Knight by Nola shows this with clarity. As you may know, Batman and Robin hood cannot fly as a bird. Do not follow all worlds Scooby-Doo told you, ask Pinky and Brain for this information. So you think you can work out who or what am i?