Sometimes I get just a drive-by inspiration for a cast of characters and have to draw at least a couple of them before my brain will let me move on, then never do anything with them again. These two are from one such incident, a harem anime where all the love interests are based on various laws of physics - these two are the laws of thermodynamics and the speed of light, respectively. I don't know where this came from considering I know next to nothing about physics.