Batman Arkham Origins : Mad Hatter returns

The long list of Batman enemies gets longer and it’s not going to stop ! since some villains have not been confirmed yet but seem like unforgettable, such as ScareCrow.

Here the list of villains confirmed so far: Joker, Bane, Black Mask, Penguin, Death Stroke, Copperhead and Mad Hatter.

Fans of Batman !  What supervillain would you like see added to that list ?