
Quick answer — Mariko Higashiuchi voices Katie in Vivy -Fluorite Eye's Song-, Okada in The Anthem of the Heart, Kurono Shinguuji in Chivalry of a Failed Knight and 7 more characters.
Mariko Higashiuchi voices Katie (Vivy -Fluorite Eye's Song-), Okada (The Anthem of the Heart), Kurono Shinguuji (Chivalry of a Failed Knight), Kaya (SHIBOYUGI: Playing Death Games to Put Food on the Table), Celia Marchalrayd (Pass the Monster Meat, Milady!), Sonoko (Harmonie), Taiiku Kyoushi (Please tell me! Galko-chan), Lucy Morstan (Case File nº221: Kabukicho) and 2 more.
Katie is voiced in Japanese by Mariko Higashiuchi.