Imitations of original products are a problem in the business culture. It results in lawsuits both by the companies of the original product and those who bought the fakes in the first place. Perhaps they were used with cheaper or low-quality materials or have functions and apps excluded from the original.
But just because something is an imitation doesn't mean it can't be just as good. In fact, it may be just as effective if not better in some areas. The main advantage mainly focuses on mass-production since they can be produced more cheaply or with materials on-hand. Even if they're not 100% as effective, the fact they're 75% or even half as effective is still better than current technology, which can be why customers wouldn't mind in the first place.
Contrast the Shoddy Knockoff Product, which is expected to be defective imitations nowhere near as good.
See also Variant Power Copying, which is an imperfect copy of someone else's ability, but may turn out to be as good (or even better) than the original. For Real Life examples of this trope, see Not-So-Cheap Imitation.
- Bakemonogatari: In the Nisemonogatari subplot, the Central Theme that surrounds the story is whether or not a "fake" can be more real than the real thing. Examples of this include Tsukihi, who turns out to be not blood-related to Koyomi, but who is still his precious sister in his eyes and Kaiki Deishuu, a conman pretending to be a Blue-Collar Warlock, who actually manages to solve a supernatural case using his guile.
- In Fullmetal Alchemist, the Starter Villain Father Cornello is given a fake Philosopher's Stone to attract mindless followers into his religious order. However, it follows the same effects such as the apparent violation of Equivalent Exchange that it fools the Elric brothers into mistaking it for the real thing.
- The GN Tau Drives in Mobile Suit Gundam 00, respectively named "pseudo-reactors" by the original creators, are only slightly less effective than the actual solar reactors. Yet, they can be mass-produced and allow Earth's nations to compete against the Gundams. The manuals explain that the Tau Drives have everything except the TD Blankets, which can be only made with materials from Jupiter and is part of a production process that takes up to a full year to make. In practical terms this has two effects: The first is the GN particles have unfortunate side-effects in high concentrations, complicating medical treatments of survivors of near misses. This is fixed by the second season (shown by the change in color of the GN particles from red to orange). The second is that the Tau drives only have a finite amount of power and need periodic recharges while the originals act as a form of Perpetual Motion Machine. This generally isn't an issue until A-Laws and the Earth Alliance start attempting to replicate Trans-Am Mode which drains the power completely.
- In A Certain Magical Index magic pretty much runs on this trope. By using something called Idol Theory, magicians copy the tools, weapons, abilities, and feats of gods and legendary figures. The result is always inferior to the o only original, but can still be literally world-shaking, with the most powerful magicians crossing into Variant Power Copying.
- Kaine, initially a mysterious character first appearing in the infamous Spider-Man Clone Saga, turns out to be a clone of Spider-Man whose powers are all enhanced versions of the original. The disfiguring mark he leaves on victims' faces is due to using his wall-sticking powers on them, precognition is Spider-Sense taken Up to Eleven, etc. As for his strength, he could hold his own against the original Spidey and two other Spider-clones AT ONCE, and once shrugged off a massive explosion with little ill effect.
- In Incarnation of Legends, Bell's self-made Dragon Fang spell is a magical but inferior imitation of Kojiro's Tsubame Gaeshi, creating a phantom blade that mirrors Bell's own sword swing to strike from two directions at once compared to Kojiro's inescapable three direction attack. While it's not as sublime or skill-intensive as Kojiro's signature move, it's still an extremely rare super short chant magic and a step toward Bell catching up to and potentially surpassing Kojiro, which the latter encourages him to do.
- The Dresden Files: Death Masks features the Shroud of Turin as a central MacGuffin with potent healing powers. Much later in Skin Game it's revealed that Jesus's actual burial shroud is somewhere else, and that the Shroudof Turin is a forgery that ended up developing the same powers as the original because so many people believed in it.
- Part of The Reveal in The Fifth Elephant is that the Dwarf relic, the Scone of Stone was not stolen, but destroyed and that the supposed thieves are holding a replica instead. This trope comes into play when it's revealed that the Scone has been destroyed and replaced with multiple replicas already, as Dwarf bread doesn't last forever. The one recovered from the supposed thieves proves a suitably accurate replacement.
- The Moon Is a Harsh Mistress: The guards of the Lunar Authority have laser guns. Chinese engineers are tasked with creating knockoffs of their laser weapons to arm members of the revolutionary forces. When the Rebellion begins, the copied laser weapons are used against the Lunar Authority's forces.
- In The Tamuli the protagonists are given quarters in a replica of a castle - the empire in the book houses visiting diplomats in replicas of buildings from their own cultures architecture as a way of making them feel at home. As one character notes, the slavish way in which the replica was constructed meant they'd included many of the castles defensive features without even realizing they were there. This comes in handy later on when an armed rebellion against the empire kicks off.
- The Psycho Rangers can vary in effectiveness depending on how the current villain is imitating the real Power Rangers. Sometimes the Mooks in Ranger suits go down as easily as they do when not wearing Ranger suits, sometimes they tap into some real power. Examples of them working as advertised are:
- The Mutant Rangers were objectively stronger than the original gang, requiring the use of upgraded (but identical) weapons to take down.
- The Trope Namers downloaded the memories of their opponents in their debut, being as strong as Rangers and knowing exactly what they're going to do, making any one-on-one battle between a Space Ranger and their corresponding Psycho Ranger a Curb-Stomp Battle in the Psycho Ranger's favor every time. They were defeated one by one over several episodes, always when the Rangers could gang up on them, and the final survivors going down in a battle involving multiple Megazords.
- The knockoff Time Force Rangers were seen in a pocket dimension - as the monster who created them boasted, they knew all the originals' moves but the originals didn't know any of theirs. They were never actually beaten in battle, instead disappearing when Wes and Jen succeeded in shutting down the pocket dimension (meaning while they executed their plan, the others were now trying to stay alive while now outnumbered by enemies they never once gained the upper hand against when they'd been fighting one-on-one) and bringing everyone home.
- The fake Beast Morphers Rangers were every bit as tough as the originals. However, they were created by a monster who was created from a video game, and they turned out to suffer from a flaw in the original game's programming (freezing up if you used a certain sequence of moves.)
- The Mighty Boosh: In "The Power of Crimping", when Lance Dior and Harold Noom steal Vince Noir and Howard Moon's style and music, they become more popular and successful than Vince and Howard ever were, threatening to completely displace them.
- Warhammer 40,000. Ork technology is either looted from enemies or built in vague imitation of their weapons (especially bolters). It annoys and horrifies the Adeptus Mechanicus to no end that such arms built with no respect for the techno-theological rules can often surpass their own wargear.
- Assassin's Creed Origins has the "Imitation Siwan sword", a Cursed With Awesome sword that does triple damage as well as multiplying your critical hit chances but also caps your maximum health to one-third of your normal maximum. Your protagonist immediately spots it for the unconvincing fake it is and puts on a show of being duped by it... because the little girl whose mother sells it to you is... adorable?
- The Excalipoor in Final Fantasy V is a crappy knockoff of the Excalibur, and a Joke Item that only does 1 damage for regular attacks. But if you throw the knockoff onto an enemy or use it for the Goblin Punch special ability, it can carry a whooping amount of damage. Additionally, its basic attack is an Always Accurate Attack, which can be exploited by using the Spell Blade ability to imbue it with status effects, even instant death.
- In Sonic Adventure 2, Tails creates a fake Chaos Emerald. He plans to have Sonic give it to Dr. Eggman, after which it would destroy the Eclipse Cannon after he used it in place of the real one. Eggman catches on because he notices two energy readings of Chaos Emeralds, but it turns out that because it's such a good copy, Sonic can use the Chaos Control ability with it just as if it were the real thing.
- Xenosaga: A Cosmic Keystone, known as the (original) Zohar, is a source of practically unlimited power. There are also several artificial constructs known as imitation Zohars, and while none of them even come close to the frightening omnipotence of the original, each one of them is a MacGuffin that grants great amounts of power to its wielder.
- Mega Man Zero: Zero himself is revealed to be a "knockoff" of Omega, the Final Boss. Despite that, Zero cares little about it and just proceeds to defeat Omega (when no other people have done before). The more impressive thing is that Omega's body was once Zero's; Zero is simply badass enough to defeat his own (more powerful, not to mention boosted) body.
- Warcraft III: Abilities come in three varieties: hero (get stronger with level but only used by heroes), normal (single-level abilities used by regular units) and items (which are mostly the same as the normal spells, but cast by using the item).
- Item versions of spells are weaker than the heroic versions, but are by no means ineffective, since the spell's effect rather than its area of effect, damage or duration is the important aspect. Additionally, they usually cost no mana to cast.
- Normal spells cost mana to use, but in some cases are more effective than the faction-unique version. For example, every faction's caster has three spells, requiring two levels of training, themselves only available after upgrading the main base twice, but some mercenaries have the ability available as soon as they're hired, leaving only the question of whether the caster or the merc is the more cost-effective unit.
- BlazBlue: Iron Tager's cyborg enhancement is described as "Artificial Causality Phenomenon Weapon", and Lambda-11's (and later Ragna's) Idea Engine is its improved version. Despite being powered by advanced (but still traditional) mechanics instead of souls, its capabilities rival that of proper Causality Phenomenon Weapons, i.e Nox Nyctores. There's also Celica's Ex Machina: Minerva, an automaton guardian made by Prof. Kokonoe (who's behind Tager's and Lambda's enhancements) as an imitation to Nox Nyctores Deus Machina: Nirvana (owned by Carl) and manages to be crazier (gameplay wise) than Nirvana does.
- Path of Exile has Replica unique items. These are essentially versions of already existing unique items with several key differences in their stats. For example, the Abyssus helmet substantially increases the amount of physical damage dealt and taken by the wearer. The replica Abyssus replaces physical damage with fire, cold, and lightning elemental damage instead, making it beneficial for builds utilizing all three elements. The lore suggests that these items were products of research by an unknown cabal of scientists. Despite going through hundreds of prototypes and perhaps thousands of test subjects, their attempts have only came very close to the original objects, but never exactly the same.
- The Unlimited Blade Works in Fate/stay night is all about creating an unlimited arsenal of Noble Phantasms that are knockoffs. Shirou states that they can not defeat the original Noble Phantasms, but are still able to imitate their abilities to a close second. Gilgamesh is defeated by this Noble Phantasm because even though he has all the originals, he merely uses them as throwing objects, never utilizing them to their full potential. That, and being copies, they can be Broken, turning them into a single use version with a rank boost that bumps the power up to the same as the original. Since it's a copy you can always just make another one after breaking the first. And many abilities can't be effectively reduced at all, so a copy of say, Rule Breaker, is just as effective as the original because it's ability is absolute and not dependent on rank at all.
- False Caster from Fate/strange fake creates false Noble Phantasms that work even better than the originals. Personally, he advocates for this trope, demanding his boss hire some mage he's heard about who can create dozens of imitation Noble Phantasms at once.
- In the same work, Saber's Noble Phantasm is Excalibur, the Sword of Eternally Distant Victory, an imitation of the real Excalibur. It's definitely weaker than the original... but Saber can forcefully treat anything from a butterknife to a tree branch to an actual blade as Excalibur and fire off the Phantasm, making it next to impossible to effectively disarm him.
- In Schlock Mercenary, Schlock starts requisitioning knockoff BH-209 Plasguns from the ship's fabber after Strohl Munitions discontinues the model. They're about as prone to exploding as the original. Supplemental notes make mention that this is a serious problem for manufacturers since anyone with a sufficiently high-grade fabber can replicate anything they make once they have the plans. Schlock is also a fan of "imitation Ovalquik", which he might prefer to the original.
- The main cast of Archer once sold a large mass of drugs for what turned out to be Counterfeit Cash. However, Cyril points out they're pretty good counterfeit bills, which even a knowing buyer would pay around twenty cents on the dollar for, partially recouping their losses.
- Volpina from Miraculous Ladybug is an Evil Knockoff of users of the Fox Miraculous created by Hawk Moth using the power of the Butterfly Miraculous. She has all of the same powers that the Fox Miraculous bestows, but she is able to create as many illusions as she wants. This is in contrast to Rena Rouge, the real owner of the Fox Miraculous, whose special power "Mirage" allows her to create one illusion before needing to recharge. At the end of season 2, it is revealed that the assumed limitations on the heroes' powers are due to inexperience rather than a hard limit, suggesting that Volpina's apparent superior ability is owed to Hawk Moth's greater experience with his Miraculous, and that Rena Rouge could match or even surpass her with enough practice.
- Also, though they did have the heroes' weaknesses, Antibug and Copycat's powers were at least equal to those of Ladybug and Chat Noir. In a Bad Future, Hawk Moth turned Chat Noir into Chat Blanc, with the "unlimited power of destruction," making him able to literally destroy the universe, or at least an area that makes the Milky Way Galaxy seem quite tiny, in one shot he so chose, though it's not clear if that's an entirely new power set or boosting the Chat Noir powers.