Posting an old RP into a new Story format?

[Chaotic Phoenix]

I've started this project a while back and just recently started it up once more, but about stories that were made from previous RPs like a.k.a, the late ADaD (Adventures of the DaD) RPs I have made a story from one of them concerning my vampire girl Rose. It does still mention other chars, but I didn't have permission to carry them over to the new story format though. ._.''

But my main question is, could I still post the stories I've generated from previous RPs in the story section? And would it be considered Fan Fic or Original?

If I can I wouldn't mind doing the same for others if it's allowed. Has been kinda fun doing this, but I don't want to offend anyone or anything... ^^''

Just wondering is all...