If "mimicry" refers to the act of imitating:
* Originality: This emphasizes the creation of something unique and not copied.
* Authenticity: This implies genuineness and not being a fake or copy.
* Individuality: This focuses on being distinct and unique, not following someone else.
* Self-expression: This emphasizes creating something from one's own thoughts and feelings.
If "mimicry" refers to a biological adaptation where one organism imitates another:
* Distinctness: This emphasizes being different and easily identifiable.
* Uniqueness: This focuses on being unlike anything else.
* Individuality: This emphasizes being unique and not imitating another species.
If "mimicry" refers to the act of imitating for entertainment:
* Seriousness: This emphasizes a lack of humor or playful imitation.
* Realism: This implies a truthful portrayal, not an imitation.
* Authenticity: This focuses on being genuine and not imitating something else.
The best antonym will depend on the specific meaning of "mimicry" in the context you are considering.