I've read all your responses, and in response have prepared the following summary report.
1. Everyone almost universally wanted combat to play a significant role in the story, but also did not want it to be the only aspect of the story.
2. Most people wanted a mixture of both PvP and PvE fights, with minimal interest in noncombat situations.
3. In respect to genre, everyone recommended a fantasy setting, with a slight lean toward a low-fantasy with Medieval tech level.
4. For starting out, everyone wanted to use low level characters that are still at a basic level, but wanted stylistic differences to be evident in the stat distribution.
5. For the story, people want me to have a structure that allows for, but does not require player-driven content. I'll be placing emphasis on the options that are available to everyone, but leave a lot of room for the particulars to vary.
6. As for posting frequency, the average sits at around once every three days at the very least.
7. Although there was complete support for a round system, I think from what I've read, everyone would actually do better from a more loose system. In particular, I've noticed that some of you would like to be able to post everyday, that is too fast for others. I will be taking steps to make sure that players don't get ahead of each other, but I feel like a round system will only prevent people from posting when they are motivated to do so, which affects morale in the long run. Instead of rounds, I'm going to organize the temporal aspect by phases of the day in which a limited amount can be accomplished so that people at different posting rates can coexist without having to speed up or slow down.
8. As for the level of challenge, I learned that everyone wants an actual challenge without pulled punches, and people would like varied intensities associated with each match. I was also surprised that a number of you don't mind risking your character's life.
9. Despite potential balancing difficulties, everyone decided that they would want character growth as a part of the RP.
With these insights, I'm going to begin designing an OOC. Look forward to its release.