They are born with those primarily to be able to pass those traits down or increase the traitlines of their progeny. I thought about hiding them on males but that’s defeat the purpose as well. I may implement a “hide on males” option so they can still pass them on.
It’s likely a few updates away, but the Crystal will eventually have an option to sacrifice a Slave to the Crystal to transfer one of their traits to another Slave/Player, which should allow that