Isn't it plainly obvious that Mei is damsel and shy from Ep 1? Isn't it also clear that she's useless? But, no, she can make real good bento, which may play an important role in our protagonist harem later
I don't think Lilin is going to be shy and distress, based on what we have seen so far (any comment, novel reader?)
And Nina, she's rather simple and act upon feeling. Don't know how she will come out to be a leader.
Felli? No comment