Schrödinger's Player Character/Playing With

Basic Trope: The player has a selection of pre-made Player Characters to choose from; anyone they didn't choose doesn't appear in the game at all.
 * Straight: Tales of Troperion offers three heroes to select from: Knight Errant Rex, Defrosting Ice Queen Lady Velvet and Master of Disguise Swift. While each has their own reasons for adventuring, once the player has chosen who they're controlling, the other two are never mentioned or referenced again.
 * Exaggerated: Tales of Troperion boasts twenty-plus pre-made characters constructed to fill various niches and show off more unusual combinations, along with a Character Customization system. Once the player selects their hero/creates their party, none of the other characters get so much as a name-drop.
 * Justified: Tales of Troperion has three stories, each taking place in a different part of the game world. You can play only one story at a time. Each story has a different protaganist. Rex, Lady Velvet, and Swift are those protaganists.
 * They are reincarnations of some powerful ancient hero, so only one is to be born in this world.
 * Inverted: Tales of Troperion boasts a Cast of Snowflakes; the only character who doesn't have a complex backstory and isn't constantly referenced and name-dropped is the hero.
 * Subverted: The other possible choices show up late in the game with appropriately scaled levels and equipment.
 * Double Subverted: ...as agents for the Big Bad. Who, after the battle, are promptly revealed as a robot or clone or under mind control.
 * Parodied: "Go ahead and choose a character to start playing. Although they all have different abilities, they do the same things, just with different names."
 * Deconstructed: Big Bad: "Ah, a knight, let me call up my wizard, he should be a good test of your abilities. Pay no attention to the side room of traps, that's for other guests...not that there has or will be any others."
 * Reconstructed: "...It's too bad the room won't get any use. It's really quite interesting, and I've even baited it with a nice trophy that transcends space and time."
 * Zig Zagged: Rex is actually motivated by his yearning for Lady Velvet, and a major subplot in his scenario revolves around winning her heart. However, Lady Velvet's scenario only gives him a passing mention or two. Swift's story is completely disconnected from either of the others, save for an optional mission where they can swipe some plot-related trinkets from her manor and potientially end up fighting one or both of them.
 * Averted: Rex, Lady Velvet and Swift are all adventuring together; the player's decision at the start of the game simply determines which of their plot arcs becomes the driving force of the story, along with which Side Quests and such are available.
 * Alternately, while the player may choose to play as only Rex, Velvet, or Swift exclusively, the other two become NPCs whose stories still go on in the background, and who occasionally interact with the player's character.
 * While they may never meet each other, hints of the other characters' existence can be found throughout the game, from NPCs mentioning them to signs of their actions and whether or not they're succeeding in their own quests.
 * Enforced: Adding more main characters is a standard way to add replayability to a game.
 * Lampshaded: Every situation where another character would excel at is pointed out. "Now, Rex if you could disguise yourself as a guard we could just walk right into the castle. Its too bad you will never master that technique."
 * An NPC constantly gets the chosen character's name confused with another one.
 * Invoked: Big Bad: Anti-knight trap check. Anti-wizard trap check. Anti-thief trap check.
 * Defied: Those knight talents might be hard for a wizard to get, but it really helps against those magic immune NPCs.
 * Discussed: Big Bad: "I've gone over all the calculations, only a wizard, knight, or thief could have survived that accident." I've prepared for all 3 just in case.
 * Conversed: "You know, what happened to those other characters I didn't choose? Did they just disappear or something?"
 * Played For Laughs: On the character selection screen, each of the trio encourages the player to pick them by boasting about their skills and playfully insulting the others. When you finally pick one, the other two throw down their weapons and complain.
 * Played For Drama: Rex, Lady Velvet and Swift have all been captured by Emperor Evulz's forces. Soon, he will arrive and subject them to a Fate Worse Than Death: transforming them into mindless thralls, struck from the minds of all who knew them. You can save one. Choose wisely.
 * Plotted A Good Waste: The dialog in the game is identical for every character. Even situations where the powers of one character's power might be used to get past the plot are simply ignored.

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