Mr Smog: a transparent teacher

Mr Smog had an impeccable pass rate in his class and an odd ability that helped him teach Biology and “weed out” those unlikely to pass. He could make any part of his body transparent to show the effect of biological processes. For these demonstrations he tended to choose failing students; this often ended in their death. One last thing of note is that despite his gender identity being male he was in fact a hermaphrodite. Meaning he had both sets of genitals along with breasts (small Bs). His class was mostly human with a few other fantasy creatures. The school he taught at was in a mainly human caption area. This class had an air elemental, a slime, two fairies, a goblin and two elves.