Says the true thing at the wrong time, on principle.
Rooster is the branch of dusk, the hour that calls the day to account before the light goes. In a chart it reads as precision: you notice what is out of place before anyone names it, and you tend to say so, at whatever cost to the room's comfort. People experience this as candor, sometimes read as vanity or criticism when it's really just a low tolerance for disorder. It shows up loudest wherever it sits in your four pillars — a year Rooster carries it into your public reputation, a day Rooster makes it your own temperament.