User blog comment:TheHachi/Hello...../@comment-4791664-20101004102018

On behalf of the local administration, I'd like to welcome you to Halo Fanon. If you need any informational help on topics ranging from Halo Canon to Military structure and organisation, feel free to ask our well-versed staff.

In regard to your questions:
 * Yes, so far as canon concerned, there is no conceivable way that all of the Flood were eliminated at Installation-00. There are still Flood frozen in stasis on undiscovered Halo rings, as well as the numerous Forerunner research facilities dotted across space.
 * Actually, most fiction is set around 2552 or earlier (mainly around the Human-Covenant War). Keep in mind that you're allowed to write fiction for generally any point in time within the Halo continuity, although fiction too far into the future (e.g. 3500) is generally frowned upon for unbalanced or "overly futuristic" technology.
 * So long as you specify that the character is your interpretation by adding your username in parentheses, you can make fanonical interpretations of canonical characters. You may also want to add the Expansion template, to indicate that it is a fanonical expansion of a canonical element.
 * The most notable that come to mind would be the Necros Project (an expanded universe project managed by administrator Ajax_013), the Against All Odds Project (also an expanded universe, managed by administrator Maslab), or Project Reignition (a series of roleplays managed by veteran The parkster).