They will know that what makes other people happy does not make them happy, and that what makes them happy makes them happier than anyone else alive.
They will see things others cannot see, hear things others cannot hear, feel things others cannot feel, and know things others do not know.
They will laugh a great deal or cry a great deal or both.
They will love humans individually, but have a hard time with humanity as a whole that may occasionally approach loathing.
They will have a handful of very close friends, and often be very lonely.
They will be unhappiest when forced to act like a human and do the things that humans do, want the things that humans want, or when they are convinced that they actually are one.
Things will not be easy for them. Because of their memories of the other side, the world will seem to them to be a wondrous calliope with just a few teeth missing on one of the cogs, and because of this tiny deficiency, the music is all off key, the horses are crashing into each other, and the children are frightened, bruised and crying.
The solutions will seem obvious and no one else will listen.
They will be repeatedly punished for shouting FIRE! in a crowded theater when the buildings are in flames no one else can see. They will get slapped on the wrist for pointing to the EXIT signs when everyone else is running around screaming and trampling each other.
They will be zealous, fanatical, and didactic about their beliefs. They will feel utterly confused.
They will have ecstatic visions and babble incoherently. They will be extremely articulate. They are prone to long periods of silence. They have no idea how to say what they really mean.
They will spend a lot of time with children and animals
They will become drunkards and dope fiends, organic gardeners, Essene soapmakers, carpenters, madmen, magicians, jugglers and clowns, lunatic physicists, painters and scribblers, travelers and wanderers.
They will dress in bright colors, frumpy sweaters, or all black.
They will smoke too much and drink too much. They will eat only macrobiotic foods. They will develop addictions to Mountain Dew.
They will often be accused of living in their own fantasy world.
They will make great lovers. Yeah, even the trolls.
They will spend too much time either making love or thinking about it.
They will speak to inanimate objects.
They will have much brighter eyes than everyone else.
They will expect their magic to work in this world and their love to heal, and they will be crushed by this world, and often they won't expect it.
It will come close to killing them.
They will visit the places where the connections still exist: the waterfalls, the mountains, the ocean, the forests. They will draw on all the power they have, and sometimes, sometimes, the magic will work. And everything will be wondrously easy. The teeth will grow back on the calliope's cog, the tune will right itself, the horses will bob gracefully up and down, around and around, and the children will giggle and sing with cotton candy stuck to their cheeks and noses.
They will spend their days trying to reconnect a branch that millions are still busy sawing away at. Often it will be more than they can bear.
While the rest of humanity is busy working on new and more efficient ways to lay waste to the Earth with the push of a button, they are saving it, a handful at a time.
They will share a common conviction that they are the only sane individuals in a world gone mad.