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A Teacher (先生 sensei) or a Professor (プロフェッサー purofessā) is someone who teach others. The second form is most used to college teachers, as an title
Gatekeepers in Touhou
In the Touhou Project, Teachers (or professors) are rather common, seen across the series. They can be found from the early PC-98 to the latest Windows games.
Characters under this Bestiary