be one of the good guys

Of a man, to act in an honest, virtuous manner. You can't tell me you're one of the good guys when you work for a company that exploits the needs of the poor for monetary gain. I knew my husband was one of the good guys from our very first date. He has always treated me with nothing but respect and integrity. Marcos stayed till 10:30 to help you get the issue out on time? Wow, I guess he's one of the good guys—none of the other doofuses in the club would do that.