Killer Machine Abe, also known as Abe, is a second-year student at Ishiyama High School and is recognized as one of the second-year bosses within the school's hierarchy. He has an intimidating appearance characterized by a large build, multiple scars on his face, and a bald head. His typical attire consists of an orange sweatshirt and a black necklace around his neck.

Abe has a very aggressive personality. He is a subordinate to Hajime Kanzaki, a third-year leader of the Tōhōshinki group, who also acts as the leader over the group of second-year leaders that includes Abe. In the story, Abe is introduced during an early confrontation with the protagonist, Oga. When some thugs kidnap the baby Beelzebub, Abe, along with his fellow second-year leaders Good Night Shimokawa and the Sanada Brothers, confronts Oga and his friend Furuichi. Abe and Shimokawa attempt to stop Oga from leaving the scene, but both are instantly defeated by him. This encounter establishes that despite his fierce reputation, Abe is not a significant adversary to Oga. In a demonstration of his vulnerability, he is later easily defeated by a high-pressure water gun. His key relationships are with the other second-year leaders, including Shimokawa and the Sanada brothers, who are his friends and fellow subordinates under Kanzaki. Information regarding his background, character development over the series, and specific notable abilities beyond standard physical aggression is unavailable from the provided material.