Seems like we've got a pretty diverse group so far. I'll toss up some comments and questions for each of them, so we can get some discussion going.
In general, I'm not quite sure where to start with this. Would anyone's characters know each other, or are they all strangers? Are the two military types current or former military? And for that matter, what sort of military? Government or Corporate? Was there a war of some sort recently?
I also totally forgot to have a "Theme Music" entry in the sample sheet, so feel free to shove some music in there for something that would play when your character takes the stage somehow.
Duncan
Given his age, I can think of a few other things people might call him.
Adepts and similar are intended to be primarily a recent thing, so most characters who have such abilities should be fairly young. That isn't to say that it's only people born within the last 20 years, though. Someone like Duncan would be particularly interesting to any corps who are researching the phenomenon.
Is he up to anything in particular, job-wise, when things begin? Or is that left open enough for us to figure out whatever is most convenient?
Atlas
Whatever this major incident was, if you want to discuss it privately (or publicly, for that matter), I can probably have NPCs and others actually reference it in one way or another.
I'm fine with him otherwise being a relative cypher of a character, but some idea of where he is as the story starts, or what he's doing would be useful.
Shell
It probably would be possible, one way or another, to replace most of her lost tissues with cloned parts instead of cybernetics, but I'm not going to gainsay it, either.
If you'd like to actually create the corporation you work for, you can. Otherwise, I have one that will probably work well enough. Similarly, if there are any particular things that would make her question her loyalty, as it's pretty obvious some such event must happen, it might be worth mentioning them for planning purposes. I won't get in the way if you have something specific in mind, though.
Renk
How'd he get the nickname of "stranglehold"? There's got to be some sort of story behind that one.
Time control is a pretty dangerous power, so I'm a bit leery of it. It's certainly the sort of thing that can be leveraged in ways that make it really strong, or can remove tension from a scene.
The general military questions above apply to him as well as to Atlas. Has he done any notorious ops that might make the news, even if he didn't? Has he gone freelance? Just about anyone could use someone with that sort of infiltration talent.
I have a couple ideas for a character of my own to toss in, or at least a few major NPCs. I'm not sure what to do there, though, or where to start things off.