Lysop, also known as Usopp, is the son of Yasopp, a sniper in the Red Hair Pirates, and Banchina, who died of illness during his childhood. His father left to become a pirate under Shanks, leading Lysop to invent stories of pirate invasions in hopes of drawing his father back. This habit made him known as a liar in Syrup Village. He founded the Usopp Pirates and maintained a close friendship with the local heiress, Kaya. Lysop inherited his mother’s long nose and dark hair, while his facial features resemble his father’s.

He joined the Straw Hat Pirates as their sniper, sharing his father’s marksmanship skills. His dream is to become a brave warrior of the sea, inspired by his father. Though often cowardly and prone to deception, he shows resilience in critical moments, protecting his friends and allies. His lies sometimes inspire others, such as the dwarves of Dressrosa.

After a two-year timeskip, Lysop grows more muscular, with longer hair and a goatee. He adopts new gear including a wide-brimmed sun cap, goggles, and headphones. His combat style evolves with Pop Greens—seeds that grow rapidly into dangerous plants—enhancing his abilities as a sniper.

During the crisis on Elegia in One Piece Film: Red, Lysop forms a mental link with his father via Observation Haki, enabling them to coordinate attacks in both the real world and Uta’s dream world. This coordination proves vital in defeating Tot Musica and protecting those trapped in both realms.

Lysop’s development includes overcoming deep fear and insecurity. He briefly left the crew during the Water 7 Arc due to conflicts over the Going Merry but returned after recognizing his place among them. His journey reflects a continuous effort to live up to his dream of bravery, often drawing inspiration from giants and warriors he meets.