I will always welcome more girl introductions. They are all perfect and unique. But thats the thing. Keep as many girls as it makes sense and doesn't dilute the uniqueness of their characters.
I have played many Harem galge where many girls were introduced but were clichéd and factory run of the mill kind. That's why lately I have taken a break from J-RPG VN altogether. The stories don't take a risk or tell something memorable apart from dropping random but unsatisfactory "scenes" to pass the Tag category.