The Siglerverse is wide open for fan fiction. Nothing will be "cannon," mind you, or part of the official story, but there is so much room to have fun it's just ridiculous. Take THE ROOKIE, for example. There is a ton of teams, all with 42 players, travelling through space, dealing with organized crime, etc. Literally thousands of stories out there that I won't have time to get to before I croak at the ripe old age of 133 (yes, I know exactly how long I'm going to live ... so I got that going for me, which is nice).
I'm sure there are a few more INFECTED victims out there (just don't let them get covered by the media, and make sure their demise is "cover-upable," and you're home free). ANCESTOR and EARTHCORE do not lend themselves to fan fiction, although there is quite a history for the Rocktopi in their 12,000 years on Earth.
So, my literary-inspired Junkies, have at it. I highly suggest you fire up your archived podcast of THE ROOKIE, or visit www.galacticfootballleague.com and check out the gigantic history section there. I mean there are a LOT of stories to be told! Try coming up with characters that aren't actually listed in the timeline, yet obey the timeline itself, and you'll not only have a ball, other Junkies will be very interested to read what you create