Who is the Japanese voice actor for Youko?

The Japanese voice actor for Youko is Megumi Satou.

Which anime is Youko from?

Youko appears in Fairy Tail: 100-nen Quest.

In Fairy Tail: 100-nen Quest, Youko is listed as a supporting character.

Favorites

Yoko is a member of the Moonlight Divinities, an all-female group of underlings that follow Selene. (Source: Fairy Tail Wikia)

Fairy Tail: 100-nen Quest

Fairy Tail: 100 Years Quest

Megumi Satou

Japanese

Bev Mageto

English

Alice Orsat

French

Michela Alborghetti

Italian