Bartholomew Oobleck

Dr. Bartholomew Oobleck is a teacher at Beacon Academy. He is first seen in "Jaunedice, Pt.2" teaching history to the students, specifically teaching about the war between the Humans and the Faunus, which appears to have taken place a few generations before the start of the series.

He is also shown to be more of an intellectual than a fighter through his actions on the battlefield in "Search and Destroy". Despite this, he still wields a weapon, which takes the form of his thermos, shown in the episode "Mountain Glenn".