You should totally watch it, season two starts in April, so you have plenty of time to watch the first. XD 

It's so so so good, you won't regret it if you watch it.

Ahem.

The general archetypes I'm considering are:

Science Geek
Guardian / Parental / Protector
Wallflower / Plain Jane / Average Joe
Religious Nut
Skeptic
Double Agent
Triple Agent
Trickster / Ego
Sporty / Jock / Active Lifestyle
Street Smart

Each "title" would have pros and cons with certain skills being their advantage/disadvantage.

And as far as plot goes, the applied and approved characters will determine the plot but basically it's about the characters coming together to defeat those after them, while also locating those who created them. It'll be heavy on character development and interaction with the background of action, being on the run, religion v science, etc. It's a bit free form in the beginning so people can get their feet wet while gain some footing as they learn about the bigger picture.