Ballistic Bob - ruled by anger and need for power.
Look him in the eye while he's in the middle of his tirade and let him firmly know but kindly that you have too much self-respect to be addressed or treated in such a manner.
Backstabbing Betty - insecure, critical, and covert operator.
Approach her directly but gently. Use a calm tone and avoid accusations that cause defensiveness. "I'm uncomfortable with the things you've been saying. Feel free to tell me directly if you've got concerns or issues."
Lifeless Lynn - cold, suffering from burnout, and scarred by office politics.
It's up to you to breathe life back into the workplace. You might organize weekly staff meetings to encourage feedback or even a morale-building holiday retreat for the entire department.
Spineless Steve - lacks courage or spunk, and always seeks the safe middle ground.
Be persistent while honoring the chain of command. Give him many opportunities to respond to suggestions and requests, and perhaps respectfully suggest that higher-ups might need to be consulted.