You searched for: “confirmer
confirmer, conformer
confirmer (kuhn FURM uhr) (noun)
An individual or authority who can, by statement, remove doubts or questions about a situation: Lorene's position of authority at the university made her the perfect confirmer to dispute the rumors circulating on campus.
conformer (kuhn FORM uhr) (noun)
Someone who adapts to the current customs or standards; or who acts in harmony or agreement with others: Although Wilbur was seen as a conformer, he never lost sight of his integrity.

The student who appeared to be from a foreign country worked hard to be seen as a conformer to campus life.

The head of the dormitory where he lived acted as a confirmer to this impression.