I updated my thing, for shits and giggles. Seemed appropriate
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First, design an unique Rival to the Hero! To underline their duality, have the Rivals fighting style be opposite of the Heros, and invert their uniforms color! Have Rival belong to a faction with diametrically opposed beliefs to Hero, though they share common endgoals! Give Rival a chip on his shoulder due to wrongs made upon his kind by Heros faction!
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Personality-wise, try thinking really out of the box, for instance making the Rival more cold, distant, intelligent, refined, and soft spoken, and mysterious and handsome and well dressed and fashionable and generally appealing.
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Have Hero and Rival initially team up as allies; you need to give them a connection, so the readers feel something if Rival suddenly becomes an enemy!
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Send Hero and Rival on an epic quest to save a common friend! The enemy can be the Heros faction, which will cause Hero to have a lot of introspection about his side not being undisputedly in the right-
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Oh, wait, the guys from the heros faction are really popular? Hold on, gimme a sec…
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Only then this guy who was supposed to be dead is not dead and slicks his hair back and planned everything bad ever
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But lets still have Rival fight a giant Caterpillar Baby monster controlled by a hamfisted evil personification of everything bad done to Rivals people. This causes Rivals relationship to the hero and his faction to
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Rival and Heros’ bond is now very strong!
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While the Hero trains for the upcoming fights against Slicked Back Hair Mastermind, remember to do the same for the Rival. It is crucial to keep the characters at a somewhat even level, for the rivalry to feel genuine. This is important. I should write this down somewhere…Ah, a table, perfect
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Launch epic Mega-Arc where the Hero’s faction faces off against a white-clad, unforeseen army of their age-old, literal opposites, bent on destroying the Heros kind as well as God and reality itself! The Hero, shockingly a dual product of both sides, must tap into both sides of his power to face the nigh- omnipotent enemy, who has been manipulating him all along, while also trying to rescue his companion who shockingly has ended up with the enemy!!!
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What? What about the Rival? Don't be daft, he has nothing to do with this
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Eh, I guess the rival can tag along again and fight some low level enemy soldiers
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"Have serious exploration of the Rivals unique relationship with the enemy forces compared to the Hero"? “Have Rival be competent and contribute with his strength, and show the impact of the training he did that one time”? What are you babbling about? The Rival can get fodderized and spend the majority of the arc offscreen and inconsequential that’s’ what he can do, whats more important is optimizing the villains design. I’m thinking mullet. Mullet and butterfly wings.
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In fact, keep interactions between Hero and Rival to a bare minimum, and completely omit him from the year-long climax to the 6-year mega arc, leaving him literally useless in a ditch. Can we incorporate the villains couch in his design?
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Rival and Heros bond is now very strong! Rival still appears to be a totally legit main character, and definitely not totally underused and mistreated, and utterly outclassed by the Fated ManBearPig protagonist!
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This close relationship is brought to the forefront in the next arc, where Rival gets taken out like an absolute chump, in order to justify the Hero joining extremely untrustworthy people in order to protect his friends.
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Now that Rival has played his role, keep interactions between Hero and Rival to a minimum. Keep rival offscreen and incapacitated most the arc, despite being the causal factor for everything, and ESPECIALLY because he can instantly expose the villain plot twist (Villain plot twists are SACRED! It is known!)
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Then, have rival show up at the end at the Heros lowest point after he’s been swindled by the untrustworthy people!
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Have Rival be totally inconsequential, as Hero ultimately solves everything by himself with his latest powerup. After all, though his assault was the inciting incident of the entire conflict, this was truly the arc of That Other Guy. You now, wossface. With the arm? This may all sound weird to you, but trust me, I’m a professional, I know where this is going, I’m the centurys greatest mangaka
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“Reigen Arataka reference”? Is he some sort of architect or fashion designer?
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Arc ends! New Arc! Due to that time back then, on the roof or whatever, Hero and Rivals are the bestest of friends and its so great you guys because youd think they’d be enemies!
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Have some other character awkwardly remind readers that Hero and Rivals are the bestest of friends and its so great you guys because you’d think they’d be enemies!
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Launch epic Mega-Arc where the Hero’s faction faces off against a white-clad, unforeseen army of their age-old, literal opposites, bent on destroying the Heros kind as well as God and reality itself! The hero, shockingly a dual product of both sides, must tap into both sides of his power to face the nigh- omnipotent enemy, who has been manipulating him all along!!!
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AND THE RIVAL JOINS THE ENEMY!
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This is it, the big one! To really hammer home the conflict between hero and Rival, make sure to adhere to the Golden Rules:
o RIVALS LINES MUST BE KEPT TO THE BARE MINIMUM. Keeps him mysterious.
o RIVALS PANELTIME MUST BE KEPT TO THE BARE MINIMUM. Makes him even more mysterious.
o RIVALS EMOTIONS MUST BE KEPT TO THE BARE MINIMUM. Mysteries are exciting! I like mysteries. Oooh, I wonder what is he thinking?
o RIVALS MUST NEVER EVER EVER CLARIFY GOALS OR MOTIVES UNTIL THE ABSOLUTE LATEST POSSIBLE MOMENT!!!!! MAX MYSTERY
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Now while Rival is generating MYSTERY AND DRAMA with his general wordless apathy and spiffy new uniform, you can get your moneys worth by using him to explore the antagonistic factions culture and ideals! Ultimately, you can build up the antagonists and make a balanced, rounded conflict with two fleshed out and relatable opposing factions!
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But of course, we must ask ourselves the question: “Are the Hero and his faction still popular?”
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If yes, just make the villains superpowered Nazis. (Side note: remember to give Hamfisted Evil Personification of Everything Bad Done to Rivals People Who Also Abuses His Daughter a ton of comedic moments, and a big climactic fight revealing what a softie he really is)
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Having thus set up the final confrontation of Hero and Rival and thoroughly explored their histories and mentality, its’ time to create the meat of the arc! Most of the arc will consist of an endless string of drawn out one-on-one battles (what else would you fill an arc with? Sewing and interior design? Ha Ha ha! Although…), and I therefore recommend a simple ranking system to keep track of the villains
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Ok, so Bazz B with his Burner Fingers and ability to burn everything will obviously get the letter- Wait hang on, I want second-in-command guy to be B, which makes Bazz B the uhhhhh whats a synonym for “burning” or “flame”, er, I guess “heat” will do. Ok, we make an exception here. Now, as for the bomb-making Bambietta Basterbine she oh fuck me, I need to take some notes, is there any space on the table leg?
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Finally, do that thing where the Hero and Rival come face to face on the battlefield, and the Hero shouts the Rivals name real loud, only the Rival doesn’t care and turns and leaves, and the Hero must chase after him
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Oh, oh oh, and then Stromboli and the main villain fight, and theres a giant brush, and a shitload of black ink, and something about eyeballs, I feel like eyeballs are really good for a villain, and his beard should get bigger!!!
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Oh right, the rivalry. Well, then Hero catches up to the Rival, and finally , you do the thing where the Hero and Rival come face to face on the battlefield, and the Hero shouts the Rivals name real loud, only the Rival doesn’t care! That works every time!!
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Then, now is finally the time to pay off all the buildup and the arcs considerable paneltime of the Rival and their conflicting philosophies and motivations and- what do you mean we haven’t done any that?
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“Mostly wordless apathetic stares”? Now that’s just not true, he got a new uniform too!
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…
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Then the Rival kicks Hero down the metaphorical stairs, forcing him to redo the journey to Rival, filling the readers to the brim with excitement and buying you at least 40 chapters to flesh out the this confrontation, last chance, no time for distractions now!
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AND THE SNIPER DUDE SHOULD BECOME A FLYING BURRITO WITH CHEESEWINGS NO WAIT, WAIT, A GIANT OWL-CENTAUR THING WHO TALKS ABOUT SINS AND DRY EYES, AND THEN HE GETS A TRUMPET BLAST REFLECTED IN HIS FACE AND DIES
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And Rival goes and
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ONLY HE DOESN’T REALLY DIE BECAUSE NOW HES A FLAMINGO OH MAN OH MAN OH MAN, AND THERES A WHOLE BUNCH OF HIM NOW, THIS IS GONNA BE SO GREAT
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And then Hero catches up to Rival, and its time to payoff several years worth of storytelling using the buildup you made the last 40 chapters, which has made the context of this re-encounter radically different from the last.
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…
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Can I have Rival kick Hero down the metaphorical stairs again?
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Oh, all right all right. Rival finally reveals his goal to the Hero. After kicking him down some metaphorical stairs again.
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And Rival reveals that…that he…was planning to… sweat betray the villains all along? Right! This will be really surprising, because no one will have suspected Rival to betray the villains, least of all the villains themselves. And Rival …wants um, the Hero and his gang to leave…because, er, his plan- which totally could only be used at this moment!- is, like, really dangerous huff huff…and he took the burden upon himself rather than confide in his friends, because grrrrgh because he still cares for them but thought he was the only one who could defeat the villains and so didn’t talk to his friends about it!!! Pheeeeeew, making art is hard. But this is surely a completely satisfactory payoff to several hundred chapters worth of character relationship.