INTRODUCTION and RULES

What the title says. I did this because all the others appear to be dead and I can't find one that I like.
I am accepting original characters, of course, but there are rules that I have to put down.
And please, no Mary-Sue's/perfect characters that have never been splatted before in their entire life and can destroy a team and dodges every bullet and so on.
Anyway, feel free to join!