Minsc will be Chaotic Good, and the other two companions will likely be good too. I think this is a decent spread.
I don't see the druid being good. More likely neutral. So I only see two good aligned companions.
But again, to repeat, it's really not about their formal alignment "tags" as such. What I want are at least three companions, distributed well across different classes, who will be very happy with me when I do exclusively "good" things and who themselves will only pursue "good" actions and choices. If their "tag" happens to be "neutral," that would be fine.