
Quick answer — Mana Ashida voices Ookami-sama in Lonely Castle in the Mirror, Ruka Azumi in Children of the Sea, Largo in Pokémon the Movie: The Power of Us and 1 more characters.
Mana Ashida voices Ookami-sama (Lonely Castle in the Mirror), Ruka Azumi (Children of the Sea), Largo (Pokémon the Movie: The Power of Us), Scarlet (Scarlet).
Ookami-sama is voiced in Japanese by Mana Ashida.