My idea is to play as a retired mad genius that wanted to take over the world but he has since been caught and forced to do community service, he will work as a vet and will have to administer medicine to animals, but this wont be any medicine it will be elements of the periodic table and by making most of the combinations of the elements will force in an unstable mixture / reaction which results in poor treatment of the animals which in turn results in longer community service for the villain. However creating useful / pure cobinations for example NaCl (salt) or H2O will result in a reduction of the villains sentence and possibly will affect his plans of taking over the world.