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Harem-Powered

 Harem-Powered
type
FeatureClass
 Harem-Powered
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Harem-Powered
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When The Power of Love meets Polyamory. This trope is to the Harem Genre what Combining Mecha is to the Mecha Genre.
A character becomes Harem-Powered when some or all members of their harem of Love Interests (wanted or otherwise) grant them powers, equipment, abilities or immunities. This can be in general (granting Life Energy to the central character) or very specific (granting one unique item/ability). In narrative terms, this trope typically acts as an unspoken justification for why the character can't choose only one partner, as rebuking any member of the harem would affect their optimal combat ability. In some cases, the character may only be able to access one power at a time, but still needs to keep members of the harem around in case they need that specific power at a specific time.
Sister trope to Battle Harem and the two can overlap. It can also overlap with the aforementioned Combining Mecha such as in the series Vandread, described below.
In video games, this is related to Level-Up at Intimacy 5.

Examples
 Harem-Powered
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2023-04-16T02:27:48Z
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2023-04-16T02:27:48Z
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Dropped link to Familiar: Not an Item - FEATURE
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Dropped link to HumongousMecha: Not an Item - FEATURE
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Dropped link to NegimaMagisterNegiMagi: Not an Item - UNKNOWN
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Negima! Magister Negi Magi (Manga)
 Harem-Powered
isPartOf
DBTropes
 Harem-Powered / int_11d3b36e
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Harem-Powered
 Harem-Powered / int_11d3b36e
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In The Hidden Dungeon Only I Can Enter, Noir gets Life Energy from erotic acts with the opposite sex; however, this loses effectiveness quickly if he only plays around with the same girl over and over again, so he needs a harem to "spice things up" and keep that LP flowing, or he'd die.
 Harem-Powered / int_11d3b36e
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 The Hidden Dungeon Only I Can Enter
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Harem-Powered / int_11d3b36e
 Harem-Powered / int_2dab0b81
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Harem-Powered
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Hundred: The trope is Played With, in that Hayato gains a Power Limiter through his harem because he's a "Variant"—a Half-Human Hybrid caused by his DNA being infected with the Savage virus. Using too much of his Variant power can cause him to go berserk, unless the Savage virus is put under control. He can do this by "giving" some of the virus to someone else, via a kiss. If the person wasn't already a Variant themselves, they will become one by kissing him. In addition to this, two other women in his harem (Sakura and his little sister Karen) can also calm out-of-control Variants with their music.
 Harem-Powered / int_2dab0b81
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 Hundred
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Harem-Powered
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Asura Cryin': A regular human is able to access two types of power.
By sacrificing the physical body of a partner, they can draw power from their bonds/love and use them to power a Humongous Mecha called an "Asura Machina". The partner in question literally has their emotions drained to supply energy to the mech and its attacks. Eventually, that partner will lose all emotions, run out of Life Energy completely, and disappear.
By forming a "contract" (usually a romantic/sexual relationship) with a demon, humans can create a Familiar called a "Daughter". The demon and the Daughter will gain power from the contract, but it will not only drain Life Energy from the demon (who will crumble into crystal once depleted) but also slowly erode the human's ability to love.
The only way to circumvent the energy issue is by taking BOTH of these options and creating what's called an "Asura Cryin". This allows the Machina and the Daughter to circulate magic with each other, both increasing their power and slowing down (but not stopping) the energy depletion. However, this does NOT solve the emotion/mind drain problem. This is reason is why Asura Cryin are feared and typically killed on sight: they're a nigh-unstoppable Person of Mass Destruction who's had their empathy and mental state eroded to the point of insanity.
In addition to this, Tomoharu ALSO gains powers from Nia, a demon who has luck-granting/draining abilities, which she can bestow upon him with a kiss.
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 Asura Cryin'
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Date A Live: Shido can absorb the powers of any Spirits he romances with a kiss so they can have normal lives. Over time, he gains a measure of control over his powers and can develop rudimentary versions of the Spirits' magical weapons for his personal use. This is because the First Spirit resurrected Shido as a Half-Human Hybrid when he died before the events of the story. The collective powers of the Spirits were always meant to be Shido's and the First Spirit merely turned regular humans into Spirits as a way to perfect and refine those powers until Shido eventually obtained them.
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 Date A Live
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Strike the Blood: Kojou is a Pregenitor vampire with the ability to summon highly destructive familiars. However, the familiars will not respect a "virgin" vampire and will only awaken if he drinks blood. In addition to that, some of his familiars require multiple different "blood donors", some require specific types of blood (or Life Energy) and some just become bored from receiving blood from the same partner over and over. Because of that, Kojou is required to keep a harem of women (and possibly men) to access his powers.
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 Strike the Blood
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Beast Tamer: Rein Shroud is a Beast Tamer of uncommon skill. Not only can he form contracts with multiple animals, when most can only handle one at a time, he can form contracts with the "utlimate species", humanoids with power far beyond a human's. When he forms such bonds with an ultimate species, he receives an aspect of their power via Power Copying. The ultimate species girls that Rein has contracted with include Cat Girl Kanade, who gives him enhanced physical strength, Weredragon Tania providing increased magical power, and the Fairy twins Sora and Luna who, respectively, provide increased magical control and immunity from status effects. The potential of such power ups is such that Sora speculates Rein may have no upper limit on his growth at all, something only the entitled hero Arios can claim.
 Harem-Powered / int_4b38bdfb
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 Beast Tamer
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Harem-Powered
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Campione!: Godou's most powerful ability, which is essentially an Instant-Win Condition, can only be activated once he sufficiently understands a god, as well as their powers and origins. The Girl of the Week is usually the only person who has that knowledge, which would take years of explanation to cover verbally. It's possible to impart knowledge all at once via magic, but a Campione's skin is Anti-Magic. Thus, the only way said girl can give the hero the power he needs to save the day is to insert the magic inside his body, which typically means through kiss or you-know-what.
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One for All and Eight for the Ninth: Izuku Midoriya, due to the combination between Bonding and One for All, gains powers as he gets closer to the girls in his harem, particularly as the bonds reach their third level, which empowers him in a way based on the girl's Quirk.
 Harem-Powered / int_6346a57a
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 One for All and Eight for the Ninth (Fanfic)
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World Break: Aria of Curse for a Holy Swordsman: In a world where people gain power from Past-Life Memories, Moroha is a rare example of someone able to gain power from two past lives. In one past life, he was a swordsman fighting for his little sister and in another, he was an Arch Mage leading a slave rebellion with his wife. All three of them have been reincarnated into this era, and only through deepening his relationships with them can he remember his past abilities. And on top of this, he also has a regular Battle Harem which provides backup.
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 World Break: Aria of Curse for a Holy Swordsman
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Magika Swordsman and Summoner: Kuzuki Hayashizaki is granted by his contracted summon Lemegeton the ability to use the magical powers of the girls in his harem. The more he and a girl love each other (Lemegeton clarifies it has to be love, not just friendship), the more powerful spells he can access.
 Harem-Powered / int_67ecbac5
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Prétear has its heroine combine with one of her Leafe Knights in order to activate one of the Pretear's eight forms.
 Harem-Powered / int_6a2e8d39
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 Prétear (Manga)
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Conception 2: Children Of The Seven Stars: The main character Itsuki is a "Visitor"—a Summon Everyman Hero tasked to fight the "impurities" which threaten it. To do this, he must romance twelve (later thirteen) maidens of virtue who will bear his "Star Children". Actually, mating isn't a requirement of the experience, but it does involve a lot of G-Rated Sex. He must "conceive" as many Star Children from each of the women in order to have an army strong enough to clear the impurities.
 Harem-Powered / int_73c39a70
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 Conception 2: Children Of The Seven Stars (Video Game)
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Vandread: Hibiki gains access to a Mecha that can combine with the mecha of several of the female heroines. The girls fight over who gets to combine with him and each fusion grants a different and specific power to the resulting "offspring". In the final battle, the mecha of the hero and all of the women combine into the "Super Vandread", which has all of the powers of the various fusions.
 Harem-Powered / int_846beec3
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 Harem-Powered / int_846beec3
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 Vandread
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 Harem-Powered / int_8edba163
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In Another World with My Smartphone: Touya can use any spell ever created, meaning he can use spells specific to any mages in his Battle Harem, and even combine them to create Required Secondary Powers for more complex abilities, such as Super Mode or Flight. He also gains access to the island of Babylon, which is a base created by Professor Regina Babylon to aid him in his upcoming battle with the Fraze with access to an alchemy lab, a mass-production workshop, and facilities for producing Humongous Mecha. Due to Regina's nature, each piece also comes with a Sex Bot for Touya...including Regina herself.
 Harem-Powered / int_8edba163
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 In Another World with My Smartphone
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Social Links in Persona games make the hero stronger by forming bonds with other people. In Persona 3, almost every Social Link with a female student can only proceed past a certain point by initiating a romance, so to max out every Social Link, the hero has to date every one of them, sometimes at the same time, without getting caught. Later games (including the remake where you can play as a female student) downplay this by allowing platonic boy-girl Social Links, which makes it possible but not mandatory.
 Harem-Powered / int_8ee238c9
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 Persona (Franchise)
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Harem-Powered / int_8ee238c9
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Archetypal: Harem King works like an odd variation of this. It gives the user the ability to transform into a different form that takes the characteristics of the Archetype of the person the user bonded with. Lincoln discovers this power with Leni while there's a Husk outbreak at the mall.
 Harem-Powered / int_aac52398
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12 Beast: Eita already has implausible ninja training, but gets superpowers when any of the girls he travels with fuses with his metal gauntlet (the harpy gives agility, the minotauress gives strength, etc.). Unfortunately, this involves him putting his hand on their breast.
 Harem-Powered / int_cae42ffa
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 12 Beast (Manga)
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Trinity Seven: Amongst Arata's plethora of powers and abilities, he possesses Power Copying, so long as he follows certain prerequisites to using an ability. His Battle Harem thus often takes it upon themselves to teach him to use their abilities (such as Full-Contact Magic) to stand a chance against the latest Arc Villain. He is also in possession of multiple Grimoires and even created an avatar for Lilith's Grimoire that has a mix of both "parents'" magic, which he can tap into at any time if his is depleted.
 Harem-Powered / int_d2c5e3ee
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 Trinity Seven (Manga)
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Yokai Girls: The various Youkai girls can project their spirit into Yatsuki to grant him weapons or armor themed after their abilities. Initially he's limited to one at a time, but after figuring out how to fuse his soul with theirs he's able to equip all of their powers at once.
 Harem-Powered / int_e09f3226
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Hybrid × Heart Magias Academy Ataraxia: Kizuna Hida can copy the Immoral weapons of the girls he does Heart Hybrid with.
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 Hybrid × Heart Magias Academy Ataraxia (Manga)
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INVADERS of the ROKUJYOUMA!?: This is a very downplayed trope, played in a more practical, long-term method than usual. Koutarou finds himself in situations where one of the girls in his harem teaches him some type of skill or bestows upon him an item or skill that slowly starts to turn him from an Ordinary High-School Student into the spitting image of the legendary Blue Knight. This allows Koutarou to eventually become the Blue Knight (via Time Travel). A full list: Sanae alters his body so he can see and manipulate spiritual energy, Theia gives him Powered Armor and the high-tech sword Saguratin, Ruth trains him in sword-fighting, Yurika gives him a defensive enchantment, Kiriha gives him a gauntlet that produces fire and electric attacks, Clan maintains his armor and incorporates the gauntlet into it, Alaia gives him the magic sword Signaltin, either Alaia or Harumi are needed to fully use the power of Signaltin, and Maki creates a mental link with him. However, Koutarou doesn't feel like he deserves the respect given to him due to his power coming from others.
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 INVADERS of the ROKUJYOUMA!?
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I Saved Too Many Girls and Caused the Apocalypse is a combination of this and Story Breaker Teamup - due to being dragged into multiple stories from different genres, Rekka gets to use abilities and equipment in places where no one sees them coming. Can't pull out the Sword In The Stone? Just borrow the alien girl's teleportation device!
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Unlimited Fafnir: Yuu is a "D", or a human born with the powers of a "Dragon", enormous Kaiju that select humans as "mates" and turn them into a matching "Dragon". Except later it's revealed that he's actually a "Counter-Dragon", and he also has the ability to "mate" with Ds. He thus "mates" with every girl in his school to protect them from being claimed by other Dragons.
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 Unlimited Fafnir
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The following is a list of statements referring to the current page from other pages.

 Harem-Powered
processingCategory2
Magic and Powers
 Highschool Dragon (Fanfic) / int_cd4b5288
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 Date A Live / int_cd4b5288
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Harem-Powered
 The Hidden Dungeon Only I Can Enter / int_cd4b5288
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Harem-Powered
 Asura Cryin' / int_cd4b5288
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Harem-Powered
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Harem-Powered
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Harem-Powered
 Hundred / int_cd4b5288
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Harem-Powered
 Otaku Girl / int_cd4b5288
type
Harem-Powered
 The Hidden Dungeon Only I Can Enter / int_cd4b5288
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Harem-Powered