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Fanfic / Collector Hero Synthesis

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Midoriya Izuku has a rather odd Quirk. One that was so powerful it should have been obvious, but it wasn't. When he finally discovers what his Quirk can do he's ostracized even more by his peers; for fear that they'll lose their 'individuality'. But with some kind words and the belief of others Izuku is going to become a Hero! Not just any Hero either! The Greatest Hero: Synthesis!
Fanfiction Dot Net summary.
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Collector Hero: Synthesis is a My Hero Academia fanfiction by Kairomaru where-in Izuku has a Quirk of his own. Specifically, his Quirk lets him duplicate the Quirks of others if he gets a blood sample from them. While Izuku still faces bullying from peers, he has much greater self-esteem as others seek to help him become a hero.

Can be read here on Fanfiction Dot Net or here on Archive of Our Own.


This fic contains examples of the following tropes, in addition to those already present in the source material:

  • The Ace: During the Entrance Exam, Izuku earns more than double the next entrants' score, earning 100 villain points and 75 rescue points, which also breaks the all time record.
  • Adaptational Early Appearance: Camie is a member of 1A and appears in the second chapter rather than in the Provisional License Exam.
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  • Adaptational Modesty: Izuku redesigns Momo's hero costume to be somewhat more modest while still allowing the exposure she needs for her quirk. The basis of the redesign comes from Onughost.
  • Adaptational Superpower Change: Izuku's Quirk is Collector rather than One For All.
  • Adapted Out: Ojiro is replaced by Camie in Class 1A. As of Chapter 3, no mention has been made of him.
  • Age Lift: Camie is one year younger than canon, being Izuku's age.
  • All Your Powers Combined: Izuku can use as many of his stockpiled Quirks at once as his stamina allows. His Amplification Quirk in particular makes his other Emitter Quirks more powerful, and thus sees a lot of use.
  • Ascended Extra: Izuku's father Hisashi plays a larger role than in canon, where he's only been mentioned.
  • Awesome, but Impractical: Several people who let Izuku copy their Quirks do so because they think their Quirks are too impractical on their own for them to become heroes.
  • Awesomeness by Analysis: A secondary effect of Izuku's Quirk makes him amazing at analyzing the Quirks of others, including knowing how they work and whether they've reached their full potential. By their second day of school, Izuku knew more about Momo's Quirk than she did.
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    • Similarly, in Chapter 3 Izuku revealed to Tsuyu that her mutant powers still had a fair bit of growing room, and that she wasn't anywhere near her limit. He also noted that his parents had maxed out their quirks and they would not get any stronger through training. In later chapters, Izuku takes the time to analyze all of his classmates quirks to give them ideas on how to train them.
  • Blood Magic: Izuku's Quirk requires he absorb some blood from others to use their Quirks. He has several microtubules in his fingers which allow him to do so easily and painlessly.
  • Boring, but Practical: Amplification makes other Quirks stronger. Rather boring for an ordinary person, but for Izuku, it's his most used Quirk by far as he can use it to amplify his other Quirks. Similarly, Lactic Acid Elimination allows him to bleed off lactic acid faster than it can build up, allowing Izuku to physically exert himself for longer.
  • Combat Medic: Izuku is learning to become this under Recovery Girl's tutlage.
  • Combination Attack: Much like All For One, Izuku has a habit of combining his various Quirks for greater effects. One of his most basic combinations is Force Projection, Air Compression, and Amplification to fire bullets of air at targets.
    • Satou, after taking advice from Izuku, learns that different types of sugar can give him different reactions - and, during the USJ Attack, he combines three types of sugar to boost his strength, durability and speed to the point he's almost like All Might.
  • Combo Platter Powers: Izuku naturally. By the time of the Entrance Exam, he's stockpiled dozens of Quirks. Some of his current Quirks include:
  • Curb-Stomp Battle:
    • In the Heroes vs Villains exercise, Izuku's fight against Bakugou barely lasts half a minute, with Izuku quickly nullifying Bakugou's Quirk then binding his hands in capture tape.
    • The second heroics class sees various students fighting in three on one matches. Momo utterly dominates her match against Mineta, Sero and Aoyama.
  • Curb Stomp Cushion: Izuku wins his match against Camie, Sato and Iida but Camie breaks his elbow and Izuku had to fight hard to defeat them.
  • Didn't Think This Through:
    • Camie and Toru try to fake Todoroki and Shoji out during the Heroes vs. Villains exercise by hiding the bomb under an illusion. But since they hid it in the same room as them, the bomb is quickly found by Shoji who simply creates dozens of arms to fill the room.
    • Mineta tries to deflect a net Momo throws at him by using his balls. As a result the net hits him and is then firmly stuck to the ground, removing him from the fight.
  • Distracted by the Sexy: Izuku has a very hard time staying on task when confronted with his female classmates' costumes, particularly Ochako, Camie and Tsuyu.
  • Equivalent Exchange: According to Izuku, Momo's Quirk only uses her lipids to create the framework of her creations. The rainbow light her body gives off is actually her Quirk changing nearby matter into the rest of the object she's forming.
  • Explosive Overclocking: Sato combines granulated, sanding and turbinado sugar to push his strength, durability and speed to impressive limits - but it has a brutal kickback that leaves him puking and trembling from the sudden sugar rush.
  • For Want of a Nail:
    • Izuku having a Quirk does wonders for both his confidence and his Quirk-analyzing skills.
    • During the Entrance Exam, Izuku gets Ochako from under the rock before wiping out the Zero Pointer.
    • Mashirao Ojiro is replaced by Camie Utsushumi in Class 1-A.
    • Because Collector allows Izuku to quickly analyze Quirks, he realizes that Noumu has multiple Quirks and warns Aizawa.
    • During the USJ Attack, Izuku manages to nullify Kurogiri's Quirk for long enough to allow Thirteen to destroy the entrance door, allowing Iida to escape earlier. However, Kurogiri manages to send all the students (save for Camie, who hid herself and Thirteen under one of her illusions) across the facility.
  • Foreshadowing: While analyzing Kurogiri's Quirk, Izuku notices that it's like someone forced three different Quirks together to act as one, clearly hinting at his artificial nature.
  • Good Samaritan: Most of the Quirks Izuku's stockpiled come from people responding to his ad in online forums, each simply wanting to help someone become a hero.
  • Good Thing You Can Heal: Izuku's Healing Aura becomes quite useful, since he gets injured several times, like when Camie broke his arm during their three-on-one match.
  • Heroic RRoD: The Combination Attack necessary for Izuku to cut the Zero Pointer in half leaves him badly injured and causes him to pass out after barely healing himself.
    • Satou's own Combination Attack, made by using three types of sugar at once, leaves him shaking and puking after its effect ends.
  • Logical Weakness: Izuku can use Emitter Quirks at full strength but can't use Mutant Quirks at all and can only use Transformation Quirks at half strength. His doctor theorizes this is to keep Izuku from changing his body so much that his own Quirk no longer functions. This also applies even if the mutation is a secondary aspect of the Quirk: for example, copying Ochako's Zero Gravity would not be useful since he wouldn't get the fingerpads she uses to activate her Quirk.
    • He does also have the same limitations the original user has. For example, copying Creation would force him to train picturing objects so he can make them.
  • Mighty Glacier: After following Izuku's advice on trying different kinds of sugars, Sato finds that sanding sugar increases both his strength and durability at the same time.
  • Mind over Matter: Izuku's first stockpiled Quirk is called Force Projection which lets him push objects away from him with his mind.
  • No-Holds-Barred Beatdown: Sato to the Alter Cloth villain that attacks him.
  • Power Nullifier: One of Izuku's neighbors gives him a Quirk that lets him keep others from activating their Quirks so long as he maintains physical contact with them.
  • Reality Ensues:
    • When Izuku shows off several unrelated Quirks during the Entrance Exam, All Might worries he might be a descendant of All For One.
    • Using several Quirks to boost his speed, strength, and reflexes allows Izuku to punch through villain bots during the Entrance Exam. But his lack of a durability Quirk means doing so injures himself.
    • Toru spending several minutes with her bare feet encased in ice causes her to start developing frostbite. Thankfully, Izuku's healing Quirk can fix it.
    • Aizawa's insistence on his students giving it their all applies to all of them. As such, he calls out Todoroki for only using his Quirk to make large blasts of ice and threatens to expel him if he doesn't use fire.
    • All Might knows intellectually that Izuku has no relation to All For One and is one of the most heroic people he's ever met, but the boy's Quirk still reminds him strongly of the villain. All Might struggles to be objective regarding Izuku due to his trauma regarding All For One. Word of God outright says that trauma like All Might's doesn't go away that easily.
    • When Sato tries his combo sugar mix, he comes out of the other end with a serious case of Explosive Overclocking since his body isn't used to the effect.
  • Required Secondary Powers:
    • Izuku's Quirk automatically tells him whether someone has a Transformation, Emitter, or Mutation Quirk so he knows whether he actually can copy them or not.
    • Averted for Shoji who can only make exact duplicates of his sensory organs unless he knows enough biology to modify them. As a result, Izuku suggests he study up on how different eyes and ears work.
  • Rule of Three: Earning three disciplinary write ups in a single school year results in an automatic expulsion from UA.
  • Screw the Rules, I Have Connections!: Defied. Aizawa calls Shoto out on only using half of his quirk and threatens to kick him out of the hero course if he doesn't use his fire as well.
  • Superhuman Transfusion: Izuku first learns about his Quirk after getting a blood transfusion from a man whose Quirk is Force Projection.
  • The Tease: Camie is noticeably more flirty than any of her other classmates.
  • This Is Gonna Suck: Izuku has a subdued variation when he realizes Bakugou is in his class at UA, muttering that of course they're in the same class. He repeats the sentiment when he sees that Bakugou is his opponent in the Heroes vs Villains excercise.
  • Took a Level in Badass: Due to Izuku's analysis and advice, multiple characters undergo this.
    • Kirishima unlocks his Unbreakable form within the first few days at UA due to Izuku suggesting he try to activate his Quirk when it's already active.
    • Ochako gets her grappling tethers at Izuku's suggestion before the USJ, instead of getting inspired by Izuku's Blackwhip, as well as air jets in her boots to fly while using her power on herself.
    • Kaminari gets a suit that plays to his Shock and Awe power, with the costume covered in cables he can electrify to defend himself and melée weapons he can turn into tasers.
    • Aoyama gets a pack that gets charged by his power and is connected to two gauntlets that can fire lasers, as well as an Energy Blade.
    • Kyouka gets several watches with pre-loaded sounds and messages, which she can then channel into her Speaker Boots.
    • Sato learns that different types of sugar give him different powers, making him more versatile.
  • Trauma Button: Izuku acts as one for All Might due to his Quirk's similarities to All For One. Intellectually, All Might knows the two are nothing alike but he still has to regularly remind himself of this.
  • Underestimating Badassery: Sato thought he had Izuku pinned due to using sanding sugar (which increase both his strength and durability) then catching him in a bear hug. Izuku nullifies his Quirk and blasts him away with Air Compression.
  • We Need a Distraction: During the Heroes vs Villains exercise, Izuku distracts Iida so Tsuyu can grab the bomb with her tongue from outside the window.
  • Weak, but Skilled: Camie's Glamour Quirk has functionally zero offensive power but she uses it creatively and is skilled at grappling to make up for it. When she, Iida, and Sato all fight Izuku at once, she's the only one to truly injure him, breaking his elbow with an arm bar and using Glamor to first go invisible and then distract him via making multiple illusions of herself.
  • Why Didn't I Think of That?: Izuku tends to cause this reaction when analyzing others quirks.
    • Kyoka is rather surprised that she never considered plugging one of her jacks into her speakers and another into a different electronic device, such as her phone, to produce more sounds than just her heartbeat.
    • Similarly, Sato never considered using anything but simple granulated sugar with his quirk and thus didn't know how, say, sanding sugar would interact with it.
    • At Izuku's suggestion, Shoji starts creating body parts of different sizes, though he admits he'll have to study biology more to do things like altered ear canals.
  • Wrestler in All of Us: Camie, who utilizes both a choke hold and an arm bar against Izuku during their match.

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