Formal:
* "Saudações, meu amigo/minha amiga." (This is the most formal way to greet someone, suitable for someone you don't know well or someone you are showing respect to.)
Informal:
* "Oi, meu amigo/minha amiga!" (This is a casual and friendly greeting, suitable for someone you know well.)
* "E aí, meu amigo/minha amiga?" (This is a very informal and casual greeting, often used with close friends.)
* "Salve, meu amigo/minha amiga!" (This is a slang greeting that is often used by young people and in certain regions of Brazil.)
Other options:
* "Olá, amigo/amiga!" (This is a general greeting, suitable for most situations.)
* "Bom dia, amigo/amiga!" (This is a greeting used in the morning.)
* "Boa tarde, amigo/amiga!" (This is a greeting used in the afternoon.)
* "Boa noite, amigo/amiga!" (This is a greeting used in the evening.)
You can also use the person's name instead of "amigo/amiga" for a more personalized greeting. For example:
* "Saudações, João!"
* "Oi, Maria!"
Remember to adjust your choice of greeting depending on the situation and your relationship with the person you are speaking to.