Rogue Protagonist/Playing With

Basic Trope: An old protagonist becomes the new antagonist in the sequel.
 * Straight: Bob was the main character in Heroes of Troperia. You get to fight him in Heroes of Troperia II: Shadow Spaghetti.
 * Exaggerated: Bob is the Big Bad in Shadow Spaghetti (or worse), and you fight him in the (True) Final Battle.
 * Every single hero in Heroes of Troperia series become the Big Bad in the installment next to his or hers.
 * In the epilogue of Heroes of Troperia: The Ultimate Final main hero Ted travels in time to the past and becomes Big Bad of the first game.
 * Justified: Bob is Brainwashed and Crazy, or maybe The Paragon Always Rebels.
 * The ending in Heroes of Troperia where he took over Empire of Evulz is canon, thus averting No Canon for the Wicked.
 * You play an amoral Villain Protagonist in Shadow Spaghetti.
 * Heroes of Troperia is a Fighting Game, it's entirely Justified that you fight Bob, the winner of previous tournament.
 * Otherwise, Bob has a very good reason (misguided or not) for stopping you in the sequel.
 * Inverted: Emperor Evulz, the Big Bad in Heroes of Troperia I become the player character in Shadow Spaghetti.
 * Subverted: It's an imposter of Bob, and Bob himself is not doing anything that hampers you.
 * Double Subverted: ...save for outfitting the imposter to assassinate you, that is.
 * Parodied: "Hello. My name is Bob. You took my hero seat. Prepare to Die."
 * Zig Zagged: ???
 * Averted: Heroes of Troperia and Shadow Spaghetti are separated in a way that won't allow Bob to appear in the sequel, let alone fighting the current protagonist. Such way includes: long in-universe time skip, different world, or Shadow Spaghetti being a Prequel.
 * Bob appears as a NPC, but he does not hinder the gamer(unless they choose to bad path, if their is one) and might even help the player.
 * Shadow Spaghetti still has Bob as the protagonist.
 * Enforced: Giving the player the thrill of being a Badass who can defeat previous savior of the world.
 * Lampshaded: "This would have been an honor to challenge you, Sir Bob." "It's Emperor Bob now, vermins."
 * Invoked: ???
 * Exploited: ???
 * Defied: Emperor Evulz is Back from the Dead (the second time!) in Shadow Spaghetti, killed Bob when he was unaware, and set himself up to be the Big Bad once again.
 * Discussed: ???
 * Conversed: ???
 * Played For Laughs: "Hey, weren't you a good guy in the previous game?!" "Yes, but this Ultra Gore Infinity +1 Chainsaw-Sword of Death 3000 is too awesome for little kids like you to use!" "Weren't you a little kid too back then?!"

You can go back to Rogue Protagonist, but be aware that he or she is likely to be Lv.99.