Have you checked out this page?

http://en.wikipedia.org/wiki/List_of_characters_in_the_Shuffle%21_series

the best of these pics are from the H-game but the likeness is pretty much the same as in the anime. That'll take care of the list other than these:

Rikorisu (note: ep 14)
Kikyou (note: ep 16)
Mikio Fuyou (note: ep 19)
Masato (note, ep 11)

Rikorisu is Nerine's alter ego (spirit of sister), Kikyou is Sia's alter ego (again, sister's spirit), Mikio Fuyou (Kaede's Father) only appears in the series once in a cameo, as does Masato, a kid pervert who takes to lifting skirts, namely Asa's in a rather ecchi portion of one of the eps. Do you want screenies of these?

Seiyuu info: http://www.seiyuu.info/extendedlisting.php?anime=Shuffle!

[ Edited Nov 7, 2007 ]