Do not put -Dub in the folder or show title. Instead, name the file with the episode and let Plex merge metadata. If you must have separate libraries, use:
Folder: Mahouka Koukou no Rettousei (2014) Mahouka Koukou no Rettousei -Dub-
File: Mahouka Koukou no Rettousei - S01E01 - Enrollment Chapter I - Dub.mkv Do not put -Dub in the folder or show title
The main criticism of Tatsuya Shiba is that he is emotionally flat (by design). In the Japanese version, Yuichi Nakamura portrays this stoicism with a soft, monotone coolness. In the English dub, Alejandro Saab (also known as Kaggyfilms) takes on the role. Saab manages to keep Tatsuya’s collected, emotionless exterior while injecting subtle hints of his hidden contempt for those who threaten his sister. It is a nuanced performance that grew on fans over time. In the Japanese version, Yuichi Nakamura portrays this
Miyuki’s English voice actor, Kayli Mills, delivers the perfect balance of regal elegance and bro-con obsession. Her delivery of "Onii-sama" (localized as "Brother" with a reverent tone) avoids sounding cringey, which is a genuine concern for sibling-centric anime.
Mahouka Koukou no Rettousei is a seminal series in the "Magic School" genre. Unlike fantasy shows where magic is mystical, this series treats magic as a technology—a programmable phenomenon processed by a device called a CAD (Casting Assistant Device).