Batman No. 357. Jason Todd is the second Robin. Jason Todd had a troubled upbringing. In this universe his Brother was killed while being lookout. Jason tracked them down and fought then. Batman took Jason under his wing and trained him to be the next Robin after Dick Grayson. Nothing else is really known, but considering the character's history the Joker is more than likely going to kill him and Ra’s Al Ghul will resurrect him. Nothing to reference, so feel free to come up with something.