
Quick answer — Ai Tokunaga voices Hana in Haibane Renmei, Maho Yumeno in Saki, Viola in Kiddy Grade and 1 more characters.
Ai Tokunaga voices Hana (Haibane Renmei), Maho Yumeno (Saki), Viola (Kiddy Grade), Kuroe (The Everyday Tales of a Cat God).
Hana is voiced in Japanese by Ai Tokunaga.