Also, I have some ideas for their species:
They are ultimately sexless, capable of asexual reproduction under very specific conditions on very specific grounds. When their planet was destroyed, that in turn destroyed all hopes of reproducing.
Otherwise, they are fundamentally human.
Nobility and power are more important to their species than living moral lives. They are raised into a mindset of "doing whatever they can to get whatever they want".
Gender is ultimately a social construct for them, and is determined by who was born first in a family. There are three hierarchical genders, the human equivilent of male (odd numbers, such as firstborn, thirdborn, etc) and female (even numbers, second born, fourthborn, etc.), and then Spheera, or holy. Any child born on a date that is a multiple of seven into a family is Spheera, but usually families don't have more than one child due to the taxing nature of reproduction and children born on dates that are multiples of seven are rare. Spheera have their primary gender (if it's the seventh, male, 14th female, 28th female, etc., making male SPheera rare. So their people count the year by days, not months. Their year is twice as long as ours), and then their holy gender, more a title or designation given to them on their 100th birthday.
Their planet is larger, thus more gravity, thus more strength, speed, agility, jump higher due to the less strenuous conditions on Earth. Over time, one can accustom to the less strenuous conditions and lose that power, but if they routinely exercise they can slow the process.
That's all I got for today sorry.