Referred to as the 'Bastard Magic Instructor' (BMI). Initially appears lazy and incompetent, but is secretly a former Imperial Court Mage Corps assassin hiding his power due to a remorseful past and severe depression. Forced to reveal his true abilities during a school attack. Ultimately finds meaning in teaching as his students help him overcome his depression.
Glenn's entire seasonal arc is driven by his evolving responsibility toward Sistine, making her the emotional core of his journey.
Ep1-12 overarching structure positions Glenn as the catalyst and Sistine as the primary focal point of his growth.
Their relationship moves from direct opposition over Rumia's fate to a tense but necessary alliance during the facility breach.
Ep8 confrontation and Ep9 lab storm highlight their initial hostility shifting to cooperative rescue.
Rumia's vulnerability consistently triggers Glenn's intervention, anchoring his motivations throughout the terrorist crisis.
Ep3/5/9 kidnapping and rescue sequences make Rumia's safety the primary catalyst for Glenn's actions.
Albert serves as a reliable partner who shares Glenn's risk, solidifying their bond through shared combat exposure.
Ep9 joint infiltration of the white alchemy lab demonstrates their established trust and teamwork.
Sistine strives to prove herself under Glenn's guidance and ultimately becomes his savior in battle.
Episode 4 states students work hard to meet his expectations. Episode 9 notes Sistine's magic saves Glenn from mortal wounds.
Rumia maintains unwavering loyalty and hope for Glenn's return despite his disappearance.
Episode 12 states Rumia holds out faith that the vanished Glenn will return.