General Antonyms:
* Conformist: Someone who follows established norms and practices.
* Conventional: Adhering to traditional or widely accepted standards.
* Mainstream: Representing the common or prevailing views.
* Orthodox: Following established doctrines or beliefs.
* Traditional: Adhering to long-established customs or practices.
More Specific Antonyms:
* Follower: Someone who supports or imitates another.
* Supporter: Someone who favors or advocates for a particular idea or cause.
* Accommodating: Willing to agree with others or to accept their opinions.
* Agreeable: Willing to comply or to go along with others.
The best antonym for "contrarian" will depend on the specific context in which the word is being used.