IMO
ORIGIN:
For lack of a better name, "Jack Napier" is having a one man comedy act. Bruce Wayne is in attendace. He fails miserably. After the show, Bruce offers him some money, which he rudely refuses. Later, he joins a group (not the mob) to provide for his pregnant wife and they rob a place called Monarch Playing Cards. Bats shows up and defeats (not kills) everyone there, except for "Napier". A chase scene involving the batmobile and a motorcycle ends a AXIS CHEMICALS. They fight up on a balcony, Bats not fighting to the extent, knowing this man, and Bats trips "Napier"(accidently) and catches him, ala '89. Instead of being captured by the authorities and being an embarassment to his family, he lets go of Bats' hand and falls into a vat of acid. Batman looks down for a brief moment, and walks away. Right after that, a sickly whit hand pops out. AOut last shot is of stressed out red eyes...
LOOK:
A suit that is bleached purple when "Jack" falls in. A sickly bright yellow flower
that squirts acid. Of course, the bleached white skin, the red lips. Make the green hair a dark green, almost black, but clearly green. His eyes, make them look like he has red eye, wit red pupils. And have him smile not all of the time, just most of it, and have him frown when he is surprised, or even scared.