
Quick answer — Kumiko Asou voices Makoto no Haha in Colorful ~ The Motion Picture, Kokoro no Haha in Lonely Castle in the Mirror, Okaa-san in Mirai and 2 more characters.
Kumiko Asou voices Makoto no Haha (Colorful ~ The Motion Picture), Kokoro no Haha (Lonely Castle in the Mirror), Okaa-san (Mirai), Sayogoromo (Miss Hokusai), Midori (The Wonderland).
Makoto no Haha is voiced in Japanese by Kumiko Asou.