Hey, I was wondering if I could get some help and perspective working out how prevalent this significant feature of my setting should be in the population, if we're going by how people would actually react to this in real life. As a quick introduction to my setting, it's the modern day in the immediate aftermath of an unknown entity imbuing humanity with the ability to use supernatural powers. Everyone over the age of 13 has a brand on their right inner forearm that has 4 (later 6) circles on it. Every week, a circle on that brand is filled by a magic rune (the same one for everyone that week) that represents a supernatural power they now have access to. When the brand fills up, whichever rune was in the last slot will be replaced when they get a new one. The which run is in which slot can be controlled with your mind, so you get to choose which set of runes you keep with you. In addition, everyone who was old enough when the brand first appeared also gained two free and permanent powers: 1: A healing factor that lets them recover from any injury within an hour to a week, retroactively healed any disabilities or injuries they weren't born with, and grants them eternal youth and immunity to disease. 2: Superhuman strength, speed and durability. Their physical capabilities are roughly doubled. For simplicity let's call the people with the above permanent powers "immortals". Now, one prominent element of this setting is that fantasy races are introduced to it via shapeshifting. Roughly half a dozen of the runes given out over the first two years are shapeshifting runes. They grant the bearer the ability to shift between their current body and the body of a few fantasy race with completely randomized genetics. So if, for example, that week's rune was the elf rune (I won't actually be using any pre-existing fantasy races, but just for the sake of example), they'll be able to transform into an elf, but the human body they have will have no bearing on what their new elf body would look like. It could be anything. Tall, short, ugly, beautiful, male, female, every single feature of it would be completely random. The only rule for its appearance is that after the first form, the next form will always be the opposite sex of the last one you got. Only immortals are given these runes (everyone else gets nothing that week), and unlike the other rune types these runes cannot be moved out of the deletion slot. Which means that when their one week of being able to freely shift between them is up, they lose the ability to shift between them forever, and whichever body they were in when it was deleted will be their new body from then on. So basically, new fantasy races are brought into the world from shapeshifted former humans, and I'm trying to get some idea of what percentage of the population would do this, and what demographics they would be concentrated in. After some thought and asking around, I can see a few reasons why somebody would do this: 1: They simply prefer the new race and what it can do. 2: Luck of the draw resulted in their new body being significantly more attractive and that matters to them. 3: The randomized nature of the shapeshifting allows them to completely escape from their old identity and start a new life without anybody ever being able to figure out who they used to be. 4: Since the immortals' healing factor is based off of the bearer's genetics and can't be turned off, shapeshifting is the only way a transgender immortal can physically transition. 5: Similarly, while the healing factor can't fix genetic disabilities rather than acquired ones, shapeshifting into a new healthy body is an option for them. 6: The physical traits and abilities of the new race could grant poor and desperate people what is essentially free job skills they can use to get work. Those are just the ones I've been able to think of and that others have pointed out. Obviously there could be more. But with these potential motivations for shapeshifting in mind, what are your thoughts on how much of the population I should depict as having done this, and who the majority of the takers were?