Physical manifestation of moral character
(Is this the same as Red Right Hand? UPDATE: Or maybe it's Evil Makes You Monstrous) Why would anyone want to be Obviously Evil? Well, maybe they can't help it. Ill-advised fashion choices such as an ominous black cloak or shoulder pauldrons with a skull motif can be avoided, of course, but if you find yourself literally growing horns, there's not much to be done about that besides getting a Nice Hat. Note that this is not about Always Chaotic Evil or Always Lawful Good "races" which have distinctive physical features: i.e., angels and demons. If horns are part of a species' anatomy (as with bighorned sheep, antelopes, and other ungulates, along with demons), but moral conduct does not have any impact on those horns, that's just anatomy, whether the species is particularly evil or not. Rather, this is a case where conduct alters physical appearance. Alternatively, it is not morality per se which alters physical appearance, but certain supernatural effects with moral aspect. In this case, a murderer who simply kills an innocent little girl with an axe would not show any physical manifestations of evil, whereas someone who ritually sacrifices the girl on an altar to Satan using dark magic would. It is even possible that simply being in the same room as the Satanic altar would be corrupting -- even if you're a hero rushing in to stop the sacrifice and save the girl, which adds additional peril to the hero's job. Outward manifestations of goodness are rarer than outward manifestations of evil. Often, goodness just means retaining the form you were born with. However, it is possible that good characters could gain outward signs -- halos, wings, a nimbus of gentle light -- of their good nature. As with evil, there is the question of whether one must merely be good (feed the hungry) or good in some manner linked to the supernatural (undertake a quest to feed the hungry on behalf of God). To the best of my knowledge, there are no cases in which simply being near a "good place" can cause physical manifestations of goodness to appear in the same sense that being near an "evil place" can cause physical manifestations of evil to appear.