Tornar-se amigo, ser amigo.
You meant in Portuguese? Brazilian Portuguese? If so... Best Friend = Melhor amigo
Amigo (male friend) Amiga (female friend)
Friend in Portuguese is amigo (for male) and amiga (for female)
The language spoken in Brazil is Portuguese - not Brazilian. The word "friend" in Portuguese is "amigo" (male) or "amiga" (female).
If you meant something like "for a very special friend", translation is: "Para um amigo muito especial" It makes little sense (in Portuguese) to say it exactly the way you put it. In any case, it would be "Para o teu amigo muito especial"
friend = amigo ( a(as in act) mee, go.
I wonder you meant "aberto", which means "open". abero isn't a portuguese word.
Brother or friend
It means "friend".
amigo (male friend) amiga (female friend)
congratulations my friend - Parabens meu amigo
Meu (My) amado (lovely) amigo (friend).