Poison Male: Mangrove. Poison Female: Sundew

Ancalagon the Black

Fire: Scorpion

Lightning: Raiden

Poison: Reptile

Ice: Sub-Zero

Smaug

Spyro

Poison: Taco Bell, Venom, My ex

If female poison, Medusa

Lightning:Thor

Black colored fire: Alduin

Deathwing