Iconoclast

ˈaɪkənəˌklæst

noun

a person who attacks or criticizes cherished beliefs or institutions

The term 'iconoclast' originated from the Greek words 'eikón' meaning image and 'klásis' meaning break. An iconoclast is someone who challenges traditional ideas and practices in a bold and disruptive manner.

V Divers Claps of Thunder Fall on Ma’am Bougon On the following day, Ma’am Bougon, as Courfeyrac styled the old portress-principal-tenant, housekeeper of the Gorbeau hovel, Ma’am Bougon, whose name was, in reality, Madame Burgon, as we have found out, but this iconoclast, Courfeyrac, respected nothing—Ma’am Bougon observed, with stupefaction, that M. Marius was going out again in his new coat.

Victor Hugo

Les Misérables