independent in thought or actions
maverick - rebel
A ‘maverick’ is a person who has different ideas or ways of behaving to others. It generally has positive connotations as mavericks tend to be spoken of in an admiring tone and, particularly in business, the word is frequently associated with successful individuals.
I’m not surprised that John left his high-paid job to start his own business. He’s always been a bit of a maverick.
Lucy was considered a maverick in her industry, which is why she made such an impact.
Voters like that the politician is a maverick. He never does or says what his party tell him to.