Tetrachromacy is an incredibly rare variation in a gene that allows women to see colors that are invisible to most people. The reason for this is that a really small fraction of women population develops the fourth cone in the eye that extends the color perception into the UV range. The way people with super vision see the world is completely different as they see a whole other spectrum of colors.
Rubber skin syndrome or Ehlers Danlos syndrome is actually a series of inherited disorders that is known to cause rapid growth spurts which leaves people with stretchy skin and incredible flexibility. People who have the Ehlers Danlos syndrome are even able to dislocate their bones painlessly. It is believed the Joker, Batman’s arch enemy, was inspired by a person who had the rubber skin syndrome.