Because my character comes from... A future world and there are minor background characters that fuel my characters... I mean the way the world works it's just Different. Leaving it out may feel like there are lots of pocket holes in my character. But putting them in also feels really content heavy and boring. Not too sure though.
You mean like having your own canon for the world around the wRHG? Sure. Loads of people here have their own version of what this world is like. There are some efforts to try and just and get some amount of consensus, but you don't have to abide by it if you don't want to.
As for the support characters, that's fine too. Nothing wrong with that. Just keep them in spoilers when you make the post. It'll be there for those who wish to use them or know about them.