The ZeRo meme primarily centers around Gonzalo 'ZeRo' Barrios, the legendary Super Smash Bros. professional player who achieved a record-breaking 56-tournament win streak. The meme often features his focused or exaggerated facial expressions, often involving his signature scarf. It gained significant traction within the fighting game community (FGC) to represent high-level skill, dominance, or humorous saltiness. While the player himself faced controversy later in his career, the ZeRo template remains a staple for gaming-related content, used to illustrate scenarios where someone is unbeatable or reacting to a 'big brain' play.