Al Leon is a 19-year-old European, the youngest of three siblings. He possesses blonde hair and green eyes, characterized by short golden locks and a distinctive long braid beside his right face. His typical attire is a formal Victorian-style white ensemble, blue socks, and he carries a walking stick.

Initially presenting as pompous and entitled, Al Leon possesses an underlying nobility. He holds deep loyalty and care for Sophia, his chaperone and childhood friend who treats him like a younger brother, having been his former babysitter. Al undergoes significant growth, forging steadfast loyalty to fellow Trans-America Wild Race competitors Appare Sorano, Kosame Isshiki, Hototo, and Jing Xiaoleng. This loyalty evolves into genuine friendship, driving him to support and protect them during shared challenges.

After losing an unofficial race to Appare, Al accepts defeat gracefully, harboring only minor, fleeting resentment. His commitment to the group is proven during critical moments, such as facing capture and a near-lynching alongside Hototo, Appare, and Xiaoleng, an ordeal that strengthens his bonds. Al also displays modesty and propriety in social situations, expressing discomfort during communal bathing scenes, highlighting his reserved nature.