The term “opponent” in literature is employed in a broad range of contexts, from literal physical adversaries to metaphorical challenges in strategy and ideology. In classic adventure and fantasy, for instance, it sets up the contrast between characters in conflict, as seen when Lewis Carroll hints at the delicate balance of power in “Alice’s Adventures in Wonderland” ([1]), or when Alexandre Dumas’s characters exchange weaponry and words in duels ([2], [3]). In mathematical puzzles and strategic treatises like those by Henry Ernest Dudeney or Sunzi, the word takes on a formal role, symbolizing not only the adversary in a game or battle ([4], [5], [6]) but also emphasizing the necessity of adapting tactics to overcome challenges ([7], [8]). Beyond the realm of physical contests, “opponent” appears in political, philosophical, and social commentary, representing conflicting viewpoints or ideologies—from Dostoyevsky’s exploration of personal rivalries ([9]) to Nietzsche’s critique of moral oppositions ([10], [11], [12]). Across these varied uses, the term underscores the multifaceted nature of conflict—in both the literal and figurative sense—found throughout literary history.