where is dr freeze?

Joker is famous for his "Joker Venom". And he is inmune to it :P

Joker

@penguinofsteel:

Totally forget about him :P Lets (now) count he's not enough good to be on the list :P

I'd go with Scarecrow as he's constantly updating his formula. Although Joker is not far behind tbh

Venom toxin beats fear gas.

Scarecrow

Always thought Scarecrow stomps.

Scarecrow.

The Joker is described as a master chemist, so let's go with him.

Why?

Joker has...

successfully made Joker toxin in a janitor's closet using cleaning supplies!

successfully developed toxins tailored to the chemistry of his targets so that only certain people will be affected when they ingest or breathe it.

made a toxin strong enough to affect Superman and the rest of the Justice League

created venom that turns people into his slaves

created a venom that will turn Batman into the Batman Who Laughs

probably has some kind of weird nano technology in the chemistry he's using

used specially made chemical weapons since his debut in the Man who Laughs comic.