General:
* Distinguish: To make clear the difference between two things.
* Differentiate: Similar to distinguish, but often implies a more subtle difference.
* Emerge: To become apparent or noticeable.
* Stand out: This is a more informal way to say "to be noticeable."
Specific to appearance:
* Conspicuous: Easily seen or noticed; attracting attention.
* Prominent: Clearly visible or important.
* Striking: Attracting attention because of being unusual or impressive.
Specific to personality or skills:
* Exceptional: Unusually good or special.
* Outstanding: Remarkably good.
* Remarkable: Worthy of attention or notice.
The best word to use will depend on the specific situation.