
Quick answer — Arisa Kiyoto voices Ritsu in kemurikusa., Nelliel Tu Oderschvank in BLEACH: Thousand-Year Blood War - The Conflict, Nox in The Case Study of Vanitas.
Arisa Kiyoto voices Ritsu (kemurikusa.), Nelliel Tu Oderschvank (BLEACH: Thousand-Year Blood War - The Conflict), Nox (The Case Study of Vanitas).
Ritsu is voiced in Japanese by Arisa Kiyoto.