Was going to put this in with more, but Im in a hurry so Imma put this up her for now and fill in the rest later.


First just some quick rules on the races or rather cultural information so you are not misguided when wanting to create something like a Shardan rebel or a human empire xeno lover or ... something like that.


First off... humans.
The human empire is a tyranical state of socialism. All of humanity is basically slaves to the empire and in return the empire hands out clothes, food, and other needed stuff. Anyone who rebels is killed instantly, anyone who escapes is labled a terrorist and hunted relentlessly. This is one reason why there are so many human pirates which even still humanity's empire controls to a point.
Humanity and the other races: Humanity is completely and UTTERLY xenophobic. Taught from birth that they are literally the only "people" in the galaxy. All other races are either mindless or near mindless. That they want nothing but the death of all humans. And as such need to either be killed or turned into slaves. Basically mainstream humanity makes Hitler look like a saint. and the holocaust look like a tickle fight. Mankind can only NOT kill eachother while they are focusing on killing EVERYTHING else. The entire galaxy has tried for tens of thousands of years to find a way to keep humanity from going this route and has failed, This is the second time humanity has gone down this route.
Long story short. a decent human being is EXCEEDINGLY rare and has a veyr VERY high chance of being killed for refusing to be a total asshat to alien races.
Humans have no longer any religion of nearly any kind, purged from their world as "trouble making nonsense" and "fuel for radical behavior" Mostly it was a move to keep humanity from realizing their differences and from whining about how bloody evil humanity has generally become.


Shardan Tribes!
Shardan are all clones of the original Shardan. They may all have very very unique personalities and memories but they all came from the same place and are inherently the same person, as such they have never had war against each other. They have fought occasionally on very very small instances but those specifically have been more or less honor bound duties involving other races. "I am honor bound to protect you!" "I am honor bound to protect you!" *protected guy looks at other protected guy* "kill him!!"
That sort of stuff.
Now one thing I wanted to add in here as a little bonus bit for culture is music.
Shardan enjoy their music but mostly just in their off time, it is a very private thing for them. If we were to hear it, it would sound something like tribal drums, metal scraping on metal, against classical music with an overtone of death metal using a choir of extremely deep male voices shouting about their ancestry and famous battles or philosophy.


Monarch's hand.
The monarch's hand is a very VERY religious group, obviously. Though the religion is far more about controlling their populace so that another dark advent is not created by accident. Most understand this, but a great many young and ignorant members of the monarchy try to rebel, sadly these young men and women are usually hunted down and killed for the safety of the galaxy.

Monarch's hand music is something like classical music with vocal additions. They normally have utterly no words in their music but rarely no voice.
Some have been known to enjoy neko music, though not many.

Neko are of course .... well... I hate to be so blunt about it but they are horny little cat people who do an obscene amount of partying. Living life and loving it is what the Neko are all about. Honor is important to them as is love and tranquility. Neko religion is an odd one. They believe in a pseudo reincarnation. Essentially when a neko dies its spirit is given to a new body and the soul goes to the afterlife. Of which the Neko believe in three. Kinda like heaven hell and purgatory but a little different. more like Heaven, sub heaven and a really crappy purgatory.
There is little the neko dont like, aside from humanity, all races generally hate humanity but boy howdy the neko HATE humanity. and I mean the bloody ******** HATE humanity. Nothing will make a neko attack and try to kill another neko faster than one of them being a "human lover" Which causes an occasional rift as the council often tries to make contact with human exiles offering protection from the human empire in exchange for a whole lot of things. But basically these humans are determined to be either in the castrate and release on this world lot or the DONT castrate and keep around lot. Though of the council races it is the Neko that are most like humans and as such many are assigned to keep the "dont castrate" group

Neko music is very VERY lively. It is considered bad luck and in very bad taste to have music that thrives off of anger or any negative emotion. VERY good luck to portray great joy and the overall ecstasy of life in your music. So many famous neko musicians sing about the joys of life, beauty and pleasure. Also, despite their undying hatred for humanity they took one thing from them with great joy. One human being will go down in history forever as the most important human ever to have existed in the eyes of the neko.
Freddie Mercury is practically worshiped as the God of decent music by the neko.