I think you can call someone a friend if you have at lease one thing in common with them.
この場合、次のような言い方ができますよ。
ーI think you can call someone a friend if you have at lease one thing in common with them.
「1つでも共通点があれば、その人を友達と呼べると思う」
to have at lease one thing in common「最低1つ共通点を持つ」
ご参考まで!