
Quick answer — Takaaki Seki voices Shutarou Kiba in Mouryou no Hako, Mattis in Ronja, the Robber's Daughter, Kameda in Lu Over the Wall.
Takaaki Seki voices Shutarou Kiba (Mouryou no Hako), Mattis (Ronja, the Robber's Daughter), Kameda (Lu Over the Wall).
Shutarou Kiba is voiced in Japanese by Takaaki Seki.