User blog comment:Plantmageskelly/VocaVisual: A Synthetic Romance/@comment-3467648-20140606152212

Hmmm, seen the big amount pf characters my recommendation would be create some templates for the body and the faces, in order to make the work easier and quicker. Also, it would nice to known which kind of basic moods/expression each character will, in order to know how create the sprite set

Another useful info that may required would be the personality of each character. Beside, in that way you can check if you are covering all the typical personalities seen in these kinds of games. You know: Tsundere, Kuudere, Tomboy, Genki girl, etc

As the guys suggested, you should include some Vocaloids of other languages as well. This will benefit you specially in the case of the males. At least I think that's a better idea, than add a avatarless VOCALOID like VY2 (unless you were thinking of 66 (Roro)... but if you do that, that it means you should include more fan designs, like Neru or Sunafuki's VY1)

P.S.:Now, I have a little question. Why Flower is a medium difficulty character? Considering she her kuudere personality, it shouldn't be easier make her display her feelings.