General synonyms:
* Unique
* Characteristic
* Remarkable
* Notable
* Individual
* Uncommon
* Special
* Peculiar
* Singular
* Original
More specific synonyms:
* Striking (for visual impact)
* Memorable (for lasting impression)
* Intriguing (for curiosity)
* Exceptional (for superior quality)
* Unmistakable (for easy recognition)
* Standout (for being prominent)
More formal synonyms:
* Idiosyncratic (for a specific trait)
* Eclectic (for a diverse combination)
* Differentiating (for setting it apart)
* Distinguishing (for highlighting the difference)
The best synonym for "distinctive" will depend on the specific context and meaning you want to convey.