@ShorticusSure, I'm willing to take on one or two more players, as one of our accepted characters has been MIA from the get-go, and a friend of mine that I wanted to bring on board hasn't been getting back to me. As such, there's definitely room in my grand schemes for you, and we're not too far along to work you in.
Let me get to answering your questions:
1. I'd say that the bare minimum posting frequency is about once a week. Twice a week will keep you up to speed with my updates, and I'll reply to you every round.
2. For starting characters, the description of what is want is basically like so: a mortal hero or legend-in-the-making, whose greater destiny is not yet achieved, but still within reach. For specific reasons, the characters will have to be human or almost completely human. I'll get back to this point later.
3. Your character's ideals and journey are very important. They need an ambition to follow, and they need to either greatly value or embody some set of ideals that sets them apart from the common man, as well as the rest of the cast.
I would greatly prefer villainous characters to be the minority, as the plot at large will require the player characters to band together against a mutual threat. The more selfish or evil characters we have, the more difficult this is to achieve.
Now, regarding your character concepts: I'm going to have to shoot down your monstrous ideas. They simply will not work, for reasons that will come to light later on. The alchemist would be interesting, as we're without our initial alchemist it would seem. A shadowy manipulator with goals other than conquest would be a decent alternative to much of the cast. A true rogue wouldn't be amiss either, as our initial smooth-talker concept had to be rejected.
We also have a notable disparity in male characters to female characters. As I said, HisforHugs is MIA, as is their female character, as is the female concept that a friend of mine was willing to contribute. I'm not demanding that you create a female character, and if you don't feel inclined to make one, that's fine. I'm just noting the current imbalance as something I would like to rectify.