It's fascinating I swear, though possibly been done before but I hope it's at least a mostly original idea and design. My character Fletcher is a part of a lineage of people who can move through different dimensions, spiritual, demon, human, and other but his only connection to that destiny of protecting people from the monsters that can also travel through these portals was severed when his grandfather died. Growing up he did his best to ignore the lights and shapes that made up these portals but as he grew up, more and more monsters of bigger and more fearsome proportions began to appear and in the middle of a hasty retreat he runs into someone similar to him. At least in that she can see the creatures too (though not the portals), other than that they're total opposites in personality and raising. Her name is Kate and she was brought up to fight these monsters and withstand moving throughout the dimensions, but her family was cursed with the inability to see the portals the monsters come from.
I don't wanna give it all away of course, plus some story fleshing is still to be done but you all get the gist of it. Hope I haven't lost too many of you on this hiatus. -__-;;