
Quick answer — Mayumi Shintani voices Haruko Haruhara in FLCL, Cindy Klein in Arjuna, San Houjou in In This Corner of the World and 14 more characters.
Mayumi Shintani voices Haruko Haruhara (FLCL), Cindy Klein (Arjuna), San Houjou (In This Corner of the World), Nonon Jakuzure (Kill la Kill), Wendy (Black Butler: Book of Circus), Kirgistani (Jaadugar: A Witch in Mongolia), Miss Shamour (Go! Princess Precure), Lucia Fex (Promare) and 9 more.
Haruko Haruhara is voiced in Japanese by Mayumi Shintani.