Though he's ludicrous and not as frightening as the regular Joker, the monstrous Titan Joker from Arkham City is still interesting. I thought he'd be a fun Light City write-up.
Real Name: Unknown
First Appearance: As Joker: Batman #1 (Spring 1940) As Joker Titan: Arkham City (2011)
AC 3  HD: 7 Attacks: Claw (2d6) or Thrown Object (2d6, medium range) Move: 15
This version of the Joker has been affected by a modified version of Bane's Venom known as Titan. Titan drives most subjects mad. Fortunately (?) for Joker, he's already quite insane and maintained his full intellect while on the drug.