{Just so you know, I got most of the info from the wiki and decided to add my intake for the sake of the plot.}
U6: Universe 6 also known as a twin universe with it's more known twin, Universe 7 are said to have the same planets, races and many more, so if there was once a planet that existed in u6 then it should also be the case with u7.
Races: As explained in the paragraph above, u7 and 6 have the same races so if u6 had humans then we know that u7 once had humans or still do. At the end of the day if you find an alien in u7 then you might also find them in u6 or they might have busted each other's head to extinction.
Saiyan race: Unlike their u7 counterparts, the Saiyans of this universe are kind, heroic?, and most of all, aren't murder hobos tryna blow up a planet just to sell it off to a sorry excuse of a lizard, tbh that might be an insult to the lizard species.
The u6 Saiyan race have a legend that explains that every thousand years a demon warrior will be born in the Saiyan race and posses unbelievable power. The legendary super Saiyan. But there was a forgotten legend about a warrior possessing the innate power of their ancestors and the ki of the demon warrior. The legend of the ancient super Saiyan.
The mc is an OC that has knowledge of dragon ball, z, and a bit of super, through a dream that might take a bit of time for him to adjust to.
When Saiyan infants are born, they are placed in an incubator pod for three years so through that they are given basic knowledge of their race and planet, also their power level are measured through the three years untill they are read to be born.
This is how they are classified:
Low class: 600,000 - 1,300,000
Mid class: 1,400,000 - 2,000,000
Elite class: 2,100,000 - 3,300,000
(If your wondering, I'll be going back to school next week so I'll at least post three to four times a week.)