Trey Headband is the yoga instructor at the Vista Del Vista Resort that Lois attends when she needs to settle herself when she discovers that she is the cause of Stewie's cursing in "Stewie's First Word".
Trey isn't properly equipped to teach and is unable to speak clearly with the guests, expecting them to automatically start doing yoga. He tries to brush off his lack of teaching when Lois asks a question, and uses a gender-neutral bathroom where he has explosive diarrhea.