Kayli Mills, the English Voice of Yunyun from Konosuba, made her debut as the Character in this series before ever Dubbing anything for the Original series.
In the English Dub, several Voice Actors play different Characters throughout the Multiple Franchises using the exact same voice since they never accounted for having to play them all in one Show before. Some Examples include Erika Mendez (Megumi, Puck, Raphtalia) Brianne Knickerbocker (Wiz, Rem, Filo) & Kayli Mills (Emilia & Yunyun).