Gene’s charismatic and athletic best friend whose easygoing nature makes him well-liked at their school.

A student who is known for his love of nature and becomes an important part of the story after enlisting in the military.

An influential student who takes a leadership role in school activities during the winter session and questions the events surrounding an accident involving Finny.

A substitute teacher who is lenient during the Summer Session and is easily won over by Finny's charm.

The substitute headmaster during the Summer Session who is strict but amused by Finny’s antics.

A classmate of Gene and Finny, who competes academically with Gene and shares a passion for learning.

The campus doctor responsible for treating students and providing medical care, including after major incidents.

The disciplinarian dorm supervisor who emphasizes the importance of following rules and aligns activities with the war effort.

The crew team manager known for his arrogance and conflicts with Gene during their time at school.

Brinker’s father who values military service and represents the old generation’s perspective on the war.