Seto Kaiba is the standout character in the first Yu-Gi-Oh! anime, despite Yugi being the protagonist and the franchise's namesake. Kaiba's impact on the card game and its rules far surpasses Yugi's presence. Even though Yugi is the face of the series, Kaiba's influence on the franchise, especially the card game, is much more significant.
In the initial season of Yu-Gi-Oh!, referred to as Duelist Kingdom, the game's rules are quite lenient. Almost any monster can be summoned to the field without incurring any cost, except for Fusion and Ritual monsters. Furthermore, the duels' locations have an effect on the inherent boosts or debuffs received by different monsters. This aligns with the overall flexible game mechanics, allowing cards to interact in unconventional ways beyond their standard effects. For example, Yugi defeats a water strategy by attacking the moon with his monster, causing tides to lower and weakening his opponent's water monsters. These games are captivating to watch but impractical to replicate in real-life gameplay. Kaiba altered the landscape of the game forever.
Kaiba Shaped the Way Yu-Gi-Oh!'s Game Is Played
In the second season of Yu-Gi-Oh!, Kaiba organizes the Battle City Tournament, a major competition that introduces a new set of game rules. These rules include tournament-specific guidelines, such as players being required to wager their rarest card during duels. Moreover, the rules aim to create a more balanced gameplay by enforcing the tribute summoning of powerful monsters and increasing the life point total from 2000 to 4000. These rule changes mark a shift from the more flexible games of Duelist Kingdom and establish the format that continues throughout the franchise's history.
Subsequent Yu-Gi-Oh! series introduce their own unique twists to the game, including new summoning mechanics and monster types. However, they largely retain the foundation of Kaiba's Battle City rules system. With this standardized rule system in place, gameplay becomes more focused on the interactions between cards' specific effects rather than their general themes. Even some of the most thrilling aspects of Duelist Kingdom's matches are adapted to fit Kaiba's rule system, such as the transformation of terrain buffs into Field spells and the introduction of the Attack the Moon card.
Kaiba’s absence would have prevented the unique gameplay style that defines the Yu-Gi-Oh! franchise from ever existing. The later series hint that Kaiba played a significant role in popularizing the game of Duel Monsters and its integration into all aspects of Yu-Gi-Oh!’s society. These factors combine to make Kaiba’s influence on the Yu-Gi-Oh! franchise surpass that of Yugi, cementing him as the series' most pivotal character.