For a person:
* Tendance: This means "trendy" or "fashionable" but can also convey an edgy feeling.
* Avant-gardiste: This means "avant-garde" and implies being ahead of the curve and pushing boundaries.
* Rebelle: This means "rebellious" and implies a defiance of norms.
* Non-conformiste: This means "non-conformist" and implies a rejection of conventional styles.
For an idea or a piece of art:
* Avant-gardiste: This is again the most common choice, implying something bold and innovative.
* Provocateur: This means "provocative" and implies something that challenges or upsets people.
* Osé: This means "daring" or "bold" and implies something that is not afraid to take risks.
The best translation will depend on the specific meaning you want to convey.