Soy amistoso.
Amigablemente = amicably, friendlily amigable = friendly
you say amigable, simpático, cordial
Hostil or Nada amistoso.
El bicho aimigable.
You could say "mejor amigo/a".
Soy honesto, amigable y único.
You would say, "Ah, bien."
amigable
To introduce someone in Spanish, you can say "¡Hola! Te presento a..." followed by the person's name. This is a friendly and common way to make introductions in Spanish-speaking countries.
besos means kisses, which could mean a friendly way of saying goodbye so you could say adios or you too could say besos.
There's no verb for being friendly. You can just say "being friendly". To say "make friends" you can say "befriend".
If you are talking to someone with whom you are not familiar, you would say ¿Habla español? If you are talking to someone with whom you are more friendly/acquainted with, you would say ¿Hablas español?