
Quick answer — Youko Honna voices Shizuku Tsukishima in Whisper of the Heart, Taeko Okajima in Only Yesterday, Nagisa Misumi in Precure and 13 more characters.
Youko Honna voices Shizuku Tsukishima (Whisper of the Heart), Taeko Okajima (Only Yesterday), Nagisa Misumi (Precure), Sumeragi Lee Noriega (Mobile Suit Gundam 00), Mina Sawatari (Glass Mask (2005)), Rin (xxxHOLiC), Brandy (The Idaten Deities Know Only Peace), Nyan Nuoku Cham (Gunbuster 2: Diebuster) and 8 more.
Shizuku Tsukishima is voiced in Japanese by Youko Honna.