@SaiyanThanks for that detailed response! I think you're on to something with having the interests of others steer and stretch you toward something new and exciting. All the things you've mentioned would totally fit here.
As a little bit of orientating, we're broken up into various RP commitments: Free, Casual, and Advanced. If you're interested in learning more about what differentiates those three, feel free to read the descriptions from the main threads.
After that, you can generally find a subset of story styles, fandoms, original works, and the like in just about each category. One thing that I would add is that you can venture into the 1x1 thread, too, and check out the interest checkers there. I've found a writer there to write with via PMs and it's been a great experience, as well. Often times, I've seen people who say they're 'shy' gravitate toward 1x1 stories with just one partner. Writing with a group is great fun, too!
Thanks for asking what I'm into! I do like Firefly and have been in that universe for about 3+ years now? Most of that time was spent on another site and in Google Docs. That said, I'm pretty open to roleplays. I even saw a guy asking for fellow bird-people and considered applying. There's all sorts on here!
The DnD classic stuff definitely attracts me as well, but more than that, I like it when writers make up their own lore, races, etc. It makes for a great world-building exercise!