Honestly, Chris... I dunno. At their age, I can't say I had too much trouble, other than being kind of an outsider for being kinda "weird," I was never in trouble because I was a loner, never talked much, if ever and kept to my own business for the most part. In fact, in elementary school, I earned student of the year once and student of the week often. Student of the month in sixth grade, but my temper started getting the better of me after that I think... at least with my friends and those I knew. I'd get close and then push them away by my "weirdness" if that's what you want to call it. I got suspended once in high school, after school detention once and Saturday school once. Not too terrible in the grand scheme of things, but I also managed to keep my grades up with an honors and AP load, along with a full time job starting at the age of 15 (and much babysitting before and after that beginning at age 12). I think I kept myself out of trouble mostly by keeping busy.
I think it's wonderful they've chosen you to be their advocate or what have you... it seems better to help counsel the child rather than instruct the adult as the adults have a harder time believing the "truth" as it were than the kids. The kids can at least learn to alter their behavior in ways that can help keep them out of trouble and out of the principal's office. Obviously, you have learned how best to control certain urges and tendencies to keep you out of trouble and you can help them learn that as well. Will it work over night? No, likely not... I'm sure you'll need lots of time in with these kids. But you will see results, that much I guarantee you.
I also agree with Kim's ideas on your second posting, she made a great listing of ideas. Your school is obviously not privy to Autism or its spectrum so much, so you should help the students and any other person in the school to become aware by beginning a program if they will allow it, and they should. I do so hope they let you.