I drew this for a science project, we had a few options and I chose to draw an element as a hero/ villan, I chose villan. This is thallium, she is an assassin whose weapon of choice is poison. Thallium is female in my opinion because female killers often prefer poison, she is an assassin because of just how deadly thallium is, her skin is red because red skin is a symptom of thallium poisoning. Her hair is light grey because of the coloration of thallium as a simple element, there is also some blue at the tips of her hair as a reference to one of thallium's uses: low temperature thermometers. The golden top is because pyrite is a source of thallium. The green is because the name thallium from comes from the word "Thallos" which means green shoot referring to the vibrant green line in its spectrum. The dead rats are a reference to one of it's other uses: rat poison.
And that's my character Thallium.