The second perpetrator in the Columbine attack, known for his height and distinctive curls, described as depressive and conflicted. He had been accepted to the University of Arizona, reflecting his potential future plans outside of the attack.

Eric Harris's parents, with Wayne working for the military and described as a stern disciplinarian. They maintain a private life post-attack and do not engage with the press.

Dylan Klebold's parents, with Tom having a background in oil and property management and Sue working in the community college system. They were reportedly shocked by Dylan's involvement in the attack.

Principal of Columbine High School during and after the attack, known for his commitment to students. He introduced surveillance cameras for cafeteria cleanup and struggled with PTSD after the event.

FBI agent and clinical psychologist involved in the Columbine investigation, arriving quickly due to his son attending the school. He helped clarify the attackers' motives and individual psychological profiles.

A teacher at Columbine High School described for his heroic efforts during the attack. His actions during the event provided safety for many students.

A student killed during the Columbine attack, she received significant posthumous media attention. Known for her Evangelical faith and initially mistaken narrative of martyrdom.

A student gravely injured during the attack, famous for his escape from a library window. He later graduated as valedictorian and pursued further studies.

The Jefferson County Sheriff during the Columbine attack, criticized for his handling and misinformation in the aftermath. He faced community discontent but stayed in office until the end of his term.

The officer who responded to threats made by Eric Harris against Brooks Brown before the attack. His investigative work was later scrutinized in light of the attack.

A student who had a complex relationship with Eric Harris, both as a friend and enemy. Notably warned by Harris to leave school before the attack.

A close friend of Harris and Klebold, especially with Dylan, who was unaware of the attack plans. His relationship with Harris deteriorated before their senior year.

A friend of Harris and Klebold who assisted in acquiring guns used in the attack. Known for her distinctive appearance and Christian faith.

A friend who was initially approached by Harris to participate in the attack. He provided information on the perpetrators’ attempts to acquire firearms.

The intermediary who connected Mark Manes with Harris and Klebold for acquiring a firearm used in the attack.

The seller of the TEC-9 firearm used by Klebold in the attack, facilitated through Phil Duran.