After consulting with the dragon god I came upon this revision of the story. Since you're the founder I will present it for permission
-The Omniverse was once a place that have no Xeno. But after the God War. Xeno suddenly appear (There origin was a mystery to be solve)
-They're originally called Extra Terrestial and ZSG altitude toward them was ... okay we could share some land. But for some reason the Xeno keep acting like Nazi ... calling themselves master race and stuff. (Also a mystery)
-The Xeno proceed to commit Genocide and other stuff that bad guy did. For the same stupid reason that Shining later commit genocide on them.
-Despite being able to litterally murder them every second if he wanted to. Shining keep display less power than he should giving the illusion that he is weak (S.D.L have a role in that)
-When he grown tire of them, his wife Setsuna (A normal Human) calm him down and become the only thing that keep him from slaughtering every single Xeno in existence.
-The Xeno assasinate Setsuna to prove their superiority over Shining. Which cause whatever tolerance he have toward them going completely fade away.
-The life condition they suffer is what they inflict on Human eon ago. So in a sense they have to drink their own medicine
-The superiority notion is a way for humanity to escape their fear of being conquered by the Xeno again. But it gone way overboard and the true meaning are forgotten.
-Even by Shining who has erase his memories about the time with Setsuna in order to escape reality and cure depression. Thus he believe in the same b.s he made up himself.
-The notion was also created in order to punish the Xeno by let them taste their medicine. Shining away has a Equality Act in mind after the Xeno learn their lesson. But he forget it after memories wipe himself
-The Xeno who still not learn their lesson decide to play thr victim card. Denied that hey ever commit any crime and that Shining are opressing them.
-The poor Life Condition under Shinig regime will be reduce to be more humane.
- After they git their equality, they immediately tried to destroy every human and still think they're the master race.
I just watch a recently aired vietdub episode of Ultraman Cosmos (Call Space Guardian in case you need to update the main wiki) and wonder what will happen if that Chaos Virus invade Showa Universe Earth.
...Have a threat, have a major threat that runs the risk of destroying all of Shining and his friends, and humanit, and even better make it the end result of their prior actions, an unintended side effect of some bioweapon they created, or an outside force that is capable of negating their reality bending powers and leaving them as normal super robots, something that ups the stakes and sense of danger.