Didn't get around to answering you last night, it varies for character concept based on what you wanted to play really, for archtypes there's the Agent (Think Agent Smith minus matrix trippy powers, or Agent K and J), the Altered Detective (Supernatural insight), Combat Wizard, Demolitions Expert, Hand to Hand combat type, Investigator, Infiltrator, Psychic, and the Techie to name a few. It really depends on the concept you'd like to play and fleshing that out which I can assist with, you get a few things for free also for skills plus a boon from the branch you pick.
As long as it's not too out there I think it would work, if you wanted to play a person who using music to channel your latent abilities (estentially a bard) to as you mentioned someone who was prior special forces and say something odd like a target get their lower half shot off and crawls away getting in a car and tries to escape.
Branch is an option afterwords so you can be the special forces shooty type in the Occult branch that may use 'special' bullets when the drek hits the fan.
If you want to play the Starbucks Barrista that just saw two people get into a sword fight and destroy his workplace before things got really weird we can work with that too.
For the most part there are a lot of things open (You still have to play a human though, please).
Granted this may not answer your question but I guess my counter question is what kind of character did you want to play and what kind of missions did you see him going on? If you want to play a combat driven spec Ops guy putting you on being at a day care would be a bit of a rough mission I guess. Possibly hilarious for me though.
On a side note did you follow the link or did the invite work?