Why not just pick a speciality like I have (computer hacker). Someone could be a lock-picker, another a sniper, another could be very strong and carry the gear, yet another could be skilled at moving quietly and so be a useful scout. You do not need character stats if you design your character as having one major skill or ability.
What I dislike in RPs like this is players who design super characters who could beat the mission alone. That's no fun at all.