Poison Generation – The ability to assault others with one or more varieties of toxins, with widely disparate effects.
Chemo (DC) is a supervillain that can fire chemicals with deadly effect.
Dr. Phosphorus (DC) has burning skin that emits radiation and toxic substances (DC Who’s Who #6).
Mr. Bones (DC) can emit cyanide from his skin (Who’s Who in the DC Universe #6).
Salamander (Image Comics) is a supervillain that has this power (The Official Handbook of the Invincible Universe #2).
Komodo Dragon has powers that are similar to the Salamander (Official Handbook of the Invincible Universe #1).
Viper (Marvel) employs poisoned weapons such as venomous darts or artificial fangs filled with poison (Official Handbook of the Marvel Universe V1 #12).
In World of Fantasy V1 #13 (Atlas), the reader is left to ponder if the chemical used by aliens is a poison or an elixir.
Hazmat (Marvel) is a human toxic dump (Marvel Nemesis – Rise of The Imperfects Official Game Guide).
Asuran Lockwatcher – Creature Collection III. Savage Bestiary
Bane Cloud – Creature Collection II. Dark Menagerie
Bile (Savage Dragon)
The original Copperhead (DC) in The Brave and the Bold V1 #78.
Major Disaster (Savage Dragon)
Runehound – D&D 3.5 – Monster Manual III
Slarecian Ghoul – Creature Collection I
Sour Grub – Creature Collection I
Trading Card Games have a surprising number of cards related to poison.
Challenge Poison Gas Trap
Lupa Poison Tipped Doll
Mind Numbing Poison
Poison Bogs of Beloch VII
Poison Dart Gun
Poison Ivy Master Manipulator
Poison Ivy Poison Kiss
Poison Ivy Seductress
Poison Ivy Strangle Vines
Poison Ivy Venus Flytrap
Poison Needles Standard
Poison of his Voice
Poison of the Old Man
Poison the Land
Poison the Well of Life
Poison Tongue Mcgillicutty
Poisoned Water Supply
Star Trek-Theta Radiation Poisoning