Frank's father, who struggles with depression and health issues, yet imparts wisdom and values hard work, alternating between dark moods and affectionate interactions with his family.

Frank's mother, a pivotal yet less prominent character, known for making their home pleasant despite poverty and showing resilience and love towards her family.

Frank's older brother, who shares a close bond with Frank, often taking a leadership role in the family and exemplifying hope for social mobility.

A history professor and spiritual advisor to Frank at college, offering guidance and support while respecting Frank's Hispanic heritage.

A philosophy professor and leader of Sodality at college, who influences Frank through his high standards and focus on charitable and social action.

Frank's friendly and athletic college roommate of Irish descent, who contrasts with Frank's reserved nature but maintains a meaningful friendship with him.

A fellow student in Frank's Latin American literature class, sharing a working-class immigrant background, and forming a deep, trusting friendship with him.

A Mexican-American friend of Frank and Laura, sharing similar cultural backgrounds with Frank and becoming part of a second family for him.

A fellow Mexican janitor at the college who bonds with Frank over their shared cultural heritage and simple, humble lives, offering insights into Frank's father's feelings.