Hybrid-8 (Legacy post)

Note Baikanon
Here's another legacy post; this comes from a small notepad I had stashed away with other stories. Of course, it's just the nucleus of an idea, but one that had me tickled pink for a while, if I remember correctly (I mean, it's only been a few years).

Hybrid-8
In the distant future, the human race is in a unique position. Earth is inhabited by 8 sentient species, each with unique gifts. Human beings have a tenacity and strength of will unmatched in any other species. This strength is desirable to the other 7 species inhabiting earth, because it amplifies their natural abilities. Being... human, they can't compete with gifted beings. In time, humans were subjugated and made to be like breeding stock, only producing powerful hybrids. As a race, humanity is fractured.

Races and abilities
Human: will
August: telekinesis
Gideon: strength
Nimro: healing
Kindner: electricity
 Quarry: temperature
Ros: phasing
Macef: telepathy

The August are the dominant race, having lived on New Earth the second-longest and having forged the Earth Agreements. The Agreements placed regulations on the human courting trade, human science habitation projects, restricts aliens from Earth, and limits race ability usage. The Agreements ended an era of war, particularly over Earth and humans.
Earth scientists, desperate to learn more about these aliens and their cultures, essentially marry into research positions. Nowadays, any human wishing to leave Earth must be willing to marry and bear children. The other 7 are all genetically incompatible amongst themselves, so marriages between them are frowned upon, as they'll never bear children.
The main character's mother is a scientist. The mother marries her first husband, and the daughter is born. The father dies, and The mother remarries to an alien and a son is born. The son is a powerful hybrid, while the daughter is a regular human.

The story would focus on the battle between the seemingly-superior hybrids, and whether or not strength of will can overcome natural powers and abilities. The hybrids don't want to be weapons, the humans don't want to be walking wombs for producing weapons, and the aliens bristle at always playing second fiddle to genetic mutts.