"Vem aqui"
This is the most direct and versatile phrase for any situation.
Here are some other ways to say "come here" in Portuguese, depending on the context:
* "Venha aqui" (formal, polite)
* "Pode vir aqui?" (more polite, asking permission)
* "Chega aqui" (informal, more like "come over here")
* "Approxima-te" (formal, meaning "approach")
* "Anda cá" (informal, used mainly in Portugal)
Remember to choose the phrase that best suits the situation and your relationship with the person you're talking to.