Jp Cast List -
Twilight Sparkle - Miyuki Sawashiro (Shinku, Canaan, Puchiko, Sakuya Izayoi (Koumajou Densetsu II), and about a 100 or so more roles...)
Apple Jack - Sora Tokui (nothing...)
Rarity - Mikoi Sasaki (nada...)
Pinkie Pie - Suzuko Mimori (Some roles, nothing I recognize though...)
Fluttershy - Emiri Kato (Kagami and Kyubey to name a few)
Rainbow Dash - Izumi Katta (Nothing I recognize)
Spike - Motoko Kumoi (Sumomo, Li Showron...)