I think this belongs here, someone move it if I'm wrong.

So, before I get to the thing I need some help brainstorming on, I should explain about Phantoms.
One could call them my way of having stereotypical elves without actually having stereotypical elves. They are no taller than humans, but generally slimmer in build. They are all elemental. I haven't decided on all of them, but here are a few of the types and their abilities.
Shadow: Can not control any element, but can blend into anything. Black hair, black eyes, and dark complexion.
Mist: Next best at blending into things. Can make fog, given that he isn't dehydrated or in a desert, as it pulls moisture from himself and from the air. He can blend into any precipitation, and some things like trees, etc. Dark hair and eyes, slightly lighter complexion than a Shadow, but humans have a hard time telling them apart.
Wind: Not very good at much. Can control wind to cause small whirlwinds and dissipate fog, but not much more. Silver hair, blue or gray eyes, and pale complexion.
Water: That's not the final name, and there may be more than one type in this category. Water Phantoms will have control over water, naturally be able to swim and stay under for longer periods of time than a human. Not sure whether to make them have blue hair or not, it'd be awfully fun...
There are a few more I've been thinking about, a fire one, or an earth one, or something along those lines. But that is not what I'm asking for help on (although it'd be handy). I'm wondering what ya'll would think would happen if a Phantom married a human. I've determined that if two Phantoms of different types marry, some of their children will be the one type (Say, Mist) and the others would be the second type (say, Wind). The Mists would be less powerful than their Mist parent, but not have any Wind power. Same with the Wind children. But if a human married a Phantom, what do you think would happen? Simply less powerful (but still phantom) children? Half human children and half Phantom children? I have no clue, genetics mostly confused me, so I don't even know how the different types would be determined/passed down....
So, if that confused you like it did me, I will let my character, a Phantom Mist, state his version of the question.
Kai: Now?
Me: Yes, now.
Kai: Amanda wants me or Klasi to marry a human, or Roel to marry a Phantom, and have kids, so she wants to know if it sounds possible and what sort of kids one would think we'd have.
Me: Very good!
Kai: I will kill you for this.
Me: Uh-huh.