good friend
In Italian, 'buon amico' is used to refer to a close or good friend. It's often used in informal contexts when talking about friendships. Like English, it can be used directly before the friend's name, for example 'mio buon amico Luigi' or can be used by itself.
Luca is a good friend to go out with.
This sentence implies that Luca is a reliable friend, especially when it comes to participating in social activities.
My good friend, Michele, loves to play football.
In this context, the speaker is highlighting that Michele, who is a good friend of theirs, enjoys playing football.
We must protect the earth, it's a good friend.
Here, the earth is being personified as a friend, suggesting that it supports and nurtures life, much like a good friend would do.