"A suit isn't a space suit - although it can serve as one. It is not primarily armor - although the Knights of the Round Table were not armored as well as we are... A suit is not a ship but it can fly, a little - on the other hand neither spaceships nor atmosphere craft can fight against a man in a suit except by saturation bombing of the area he is in."
In order to combat fully-cyborg individuals (like the protagonists), paramilitary organizations in Ghost in the Shell occasionally requisition Power Armour. They're exceedingly rare, however.
Mazinger Z: In New Mazinger (one of the alternate manga continuities) several characters (including Kouji Kabuto) wore combat, powered armor.
The Tekkamen from Tekkaman Blade appear to wear powered armor, but in fact become metallic life forms when they transform. However, the Sol Tekkaman units ("Teknosuits" in Teknoman) are actual powered armors.
Macross Frontier, gives us the Debut of the EX-Gear, a powered armour/exoskeleton (with built in Jet Pack and provision for a BFG) suit for use by VF pilots, granted it's not as well armored as some of the contemporaries (the waist, upper arms, and thighs are somewhat exposed, as poor Michel found out...) but you must take into account thats its main function is to serve as a linkup/ejection system for the new line of Variable fighters.
Frontier also gave us the one-off "Armored Klan": Klan Klan was unable to get to her powered armor suit to repel a Vajra attack, so she improvised by strapping on equipment designed for Valkyries in order to fight.
B-Ko from Project A-Ko breaks out a Stripperific mockery of one for her showdown with A-Ko... at least it would be a mockery if it did not enable her to fight a running battle with the Humongous Mecha-wrecking titular lead.
Bonta-Kun in Full Metal Panic? Fumoffu is a Theme Park mascot converted into the cutest miniature death machine since Metal Slug by Sousuke Sagara. Oddly enough, he marketed it to various police forces around the world, with limited success. Even more oddly, it appears to be based on Sharp X68000 hardware.
The Ranma ˝ manga presents Do-chan (for dogi, a martial arts uniform, plus an affectionate suffix.) It is an ancient, sentient (and utterly perverted) suit of armor that looks like a puffy Chinese blouse, black leggings, and a yin-yang belt. It can move around independently, has limited senses (sight, hearing, and touch, at least) and can fight to defend itself. It will only accept a female owner, but those who wear it will find that their speed, power, and agility have been increased to match their own ultimate potential. Thus, when Akane wears it, she can punch enormous craters into asphalt, leap over buildings, and generally outclass Ranma to the point of utter humiliation.
A more straight-up example is the Battle Armor which Gosunkugi purchased off a mail-order ad. It promises amazing strength and incredible combat skills for defeating one's foes... and it certainly delivers, except that it locks into place as soon as you put it on and only activates when said foe comes along. And then, you have a very limited time to defeat him before the suit self-destructs.
One of the more bizarre powered armors comes from Kemeko Deluxe!. The titular Kemeko is a Super-Deformed, borderline Gonk-ish power suit that nonetheless provides its wearer, MM, with enhanced battle capabilities. MM herself wears a Latex Space Suit and has to have some form of hammerspace inside that thing - she's bigger than it is.
Gantz gives the hunters particularly hypertech powered armour that provides superstrength, Roof Hopping jumping powers and apparently some kind of forcefield. In typical Gantz style the big black ball doesn't bother telling anybody these facts, or that the suits' protection does not extend to swords or lasers.
As seen in the Osaka and Italy arcs, there is a bigger, tougher Gantz armor that's supposed to be superior to the regular suits. It's not sure if it can really hold up considering all of the users seen thus far are dead.
The Gold Cloths in Saint Seiya certainly qualify. Although Bronze and Silver Cloths, as well as rival gods' distinctive suits of armor, can protect the wearer to a supernatural degree, the Zodiac-based Cloths of Athena's Gold Saints provide notable increases in strength, speed, and defensive power, far beyond any other Cloth, Scale, or Surplice. They can even survive absolute zero and being hit with earth-shattering attacks.
Also, the anime presented a three-man squad called the Steel Saints, created by the Kido Foundation as assistants to the heroic Bronze Saints. Their "Cloths" are mechanical and crammed with gadgets that can emulate a Saint's supernatural abilities. They were Put on a Bus as soon as they could...
In GaoGaiGar, Cyborg Guy has a suit of "Ultimate Armor". He graduates to "ID Armor" when he becomes an Evoluder. It's not clear whether the armor is enhancing his natural strength and speed, enabling it, or is just there to look cool. That said, the ID armor has one important part in it (the GaoBrace and Will Knife), and Evoluder Guy probably at least needs the ID Armor to pilot GaoFar and GaoFighGar.
The Figures in Figure17 are a kind of sentient powered armor, and Hikaru is an accientally-created Artificial Human derived from a broken Figure, who can still revert to Figure form when necessary. The aliens D.D. and Oldina also use Figures to fight.
Guyver: Bio-Boosted Armour, a manga from the late 80's, along with a one shot OVA from '86, a twelve part mini-series released by studio L.A. Heroes released from 89 to about 92-93 and also a twenty six episode series that expanded more on the manga than the twelve episode one, that was released in 2005 by FUNimation Studios. This series uses this concept to its fullest extent. It starts out with a high schooler named Sho Fukamachi walking in the woods near the school with his friend Tetsuro Segawa. There they hear and see the aftermath of a huge explosion and see something hurdling through the sky towards them. Sho picks it up to and points out that it's alien looking, when he all of sudden trips and smacks his face against it and it starts to encompass him. Later when Tetsuro is in immediate danger from a secret world government style organization known as Chronos, Sho clad in this "bio" metal armor then destroys the ones troubling Tetsuro. Afterward he seemingly regains consciousness while still in the armor and notes that it is DEFINITELY alien.
A downside of the armor is that they can't be permanently separated from their recognized user without the Remover. The user can "dequip" the armor at will when not needed and it's been demonstrated that a sufficient electrical jolt to the control metal can cause the armor to spontaneously dequip.The Removers have to be bonded to someone and though they don't kill the host, they do leave them naked and powerless in front of someone who wanted to strip their armor from them, probably a bad guy.
Appleseed has two classes of Powered Armor: "Protectors", which are fairly standard suits; and "Landmates", which border on being Mini-Mecha and suspend the wearer in the torso of the armor. The Landmates' main outer "Slave Arms" follow the movements of the arms of the pilot, placed in smaller, form-fitting armored gauntlets which dangle outside the main body.
Steamboy has one of the least impressive examples of Powered Armor on this list. They're basically full-plate armor with steam backpacks (how they're not cooking with that setting, I'm not sure), showing immunity against small arms fire and not much else.
One interesting variation in Pokémon Special is what Koga wears during the Silph Co. siege. His armor is made out of his Pokemon. His Muk forms a shoulder and chest plate while his Golbat rests on his arm for a tonfa-like weapon. His other arm has an Ekans wrapped around it.
Mewtwo's armor in Pokémon: The First Movie is a partial aversion in that its only power is to weaken Mewtwo's power to a level where he can safely battle without slaughtering his opponent as well as keep him under control.
From Naruto, Akatsuki member Sasori is the prime example, hiding himself in a mobile and heavily armed puppet, we also have a version of this of the spiritual version in the form of Susano'o, which Sasuke Uchiha and Itachi Uchiha use.
In its higher forms, Sasuke and Itachi's Susano'o falls more into Mini-Mecha in their size and power. Same with Madara's in its 'complete' (full skin form) but it turns into a Humongous Mecha in his 'Perfect' Form.
Similar to the Toph example below, Risho of YuYu Hakusho used earth to cover himself for battle, although it's not clear if it actually powered him or just lent more ferocity to his blows.
Tony Stark first built his powered armour in the Vietnamese jungle and has since made countless upgrades, redesigns and variants to stay ahead in the Powered Armour arms race with villains like Titanium Man and the Crimson Dynamo. To make matters worse, villains are constantly trying to steal his designs, and the first Spymaster succeeded. His sale of Tony's blueprints on the black market sparked the Armor Wars, a storyline in which Iron Man goes about attacking armored villains and heroes in a fit of paranoia over misuse of his inventions.
His friend James Rhodes has used Stark armor many times, either taking up the Iron Man mantle while Tony was incapacitated or presumed dead, or working independently as War Machine.
Pepper Potts also has her own armor that was designed by Tony, called "Rescue".
Doctor Doom. Contrary to its almost medieval-industrial revolution aesthetic, being covered in visible rivets and displaying no apparent electronics, it is actually a nuclear-powered, ultra-sophisticated walking tank that stands up next to Tony Stark's best designs. It makes him strong and tough enough to go toe-to-toe with the Thing, discharge an array of devastating energy attacks, enables him to fly and control his vast arsenal of external technological devices. (Some versions even have a device that renders him immune to direct assault by mutant powers, so Magneto's victory over him in a fight isn't as assured as it would be against Tony.) He can basically beat the tar out of any non-"cosmic" character short of the Hulk and Squirrel Girl.
Doom also has on occasion created stronger variants of the armor, powered by draining some of the above-mentioned "cosmic" characters and thus rendering Doom's power almost as God-like as his ego. Since Doom is also a mage, he can use a combination of magic and science.
In one notable issue of Mighty Avengers (just before Civil War) Doom and Iron Man go one-on-one after the rest of the Avengers were subdued by an army of Doombots and array of traps. Their suits are so well matched that it comes down to whose suit's battery can last longer. It's Doom's.
In Kingdom Come Batman needs an exoskeleton to move at all (thanks to the wounds from a life-time of crimefighting). His actual Batman costume is a Powered Armor. As is the Blue Beetle's and several other heroes.
Batman foe Mr. Freeze has to wear a sealed, temperature controlled suit to even survive in lukewarm environments, due to his cryophilic physiology/disease/disorder/whatever. Many writers offset this by outfitting Freeze' suit with a powered exoskeleton capable of breaking a man in half.
In Batman vs. Predator, Batman resorts to this in order to continue the fight while recovering from the asskicking the Predator gave him earlier on. Also uses sonar to beat the Predator's cloak.
His Insider Suit was a suit with the powers of every League Member. The problem is, using those powers required a ridiculous amount of energy.
He's had power armor built for both Batwing vigilantes, one looking like a more armored version of the Batman Beyond suit.
He has broken out two power suits during the New 52. One to fight against Terminus, a dying villain whose armor doubled as life support, but also during the Night of the Owls, when he uses a suit so large it was basically a mecha. Although he used this suit specifically so that he wouldn't be frozen when Alfred lowered the temperature in the room to freeze the (undead) assassins.
Lex Luthor has twice donned a suit of Powered Armor to fight Superman mano a mano: Once in the early '80s, quickly abandoned after Crisis on Infinite Earths; and once in the mid-'00s, during the run-up to Infinite Crisis, when temporal shenanigans were causing Lex to play out his pre-Crisis persona. On neither occasion did it last; he's just a more compelling villain without powers.
Luthor also gains a sort of Powered Armor in Justice League. It increases his abilities, but its main purpose is to keep his Kryptonite-induced disease in check (shooting Kryptonite rays is just a bonus). The Luthor that shows up in various video games (particularly fighting games) also wears the armor.
Brianna Diggers of Gold Digger uses a variety of Powered Armor, and even Gina has broken one out one or two times.
The Ninja Turtles from the year 2094 wore these during an arc in the Archie comic, based on action figure designs.
The 616 version of the Rhino is a muscular thug in a suit resembling the hide of a rhinoceros. However, the Ultimate Marvel version of the Rhino is a wimpy geek in a high-tech suit of robotic armor. They drew on this portrayal for the character's appearance in The Amazing Spider-Man 2.
Dan Dreiberg of Watchmen tried making a powered exoskeleton version of his costume. It didn't get past the prototype stage; the first (and only) time he wore it, it broke his arm.
The DCU's Rocket Red Brigade, who are basically the Powered Armor division of the Russian army. Originally, their armor was blocky and square; in recent years, they've shifted to a more streamlined, figure-fitting design.
Supernaut of the Stark-backed Order uses a suit so big it practically qualifies as a miniature Humongous Mecha, with enough armament for a small army to boot. Supernaut's somewhat notable in that outside of his suit, he's a paraplegic.
The Asgardian Destroyer is an unusual example, since it is, depending on your point of view, not an armor at all, or the very purest form of armor. It is not wearable, but rather sucks up the spirit of a sapient being that comes too close to it - it cannot operate on its own, although it quickly overrides the will of anyone who powers it. Unless that individual's will is strong enough. Anyway, it's more or less an armor that is powered by its 'wearer' instead of the other way around. It might be the most powerful armor in comics (well... apart from the Celestials' armor, but that might not be armor).
In "Superman:3D", a substory of Final Crisis, Superman and Ultraman (his evil counterpart) are merged, together, with a 'thought robot' made out of 'divine metals' by Monitor Dax Novu to defeat the Dark Monitor, Mandrakk. This 'thought robot', basically a giant (really giant. It's giant in the World of Nil, where the Monitors live - which means that it is much, much, much bigger than a universe) mecha empowered by the dual spirits of the two supermen, meant for one single battle. It is super(of course)-adaptive, getting stronger in response to its opponents' strength.
Darkhawk has his entire body replaced by a powered armor body.
An interesting version appears in Okko—the Combat Bunraku are huge, wooden, and entirely analog, being controlled via series of ropes and pulleys by the "puppeteer" who sits in the chest cavity.
Even Captain America got in on the armored action in the mid-90s, as he was forced to wear an armored version of his familiar red-white-and-blues due to the Super-Soldier Serum breaking down in his body and rendering him paralyzed. Naturally, it didn't take.
Sonic the Hedgehog's Rotor Walrus has taken up wearing Powered Armor when he decided to return to active duty.
Back during the original "Death Egg Saga", Sonic, Tails and Robotnik all donned powered armor, though Sonic and Tails' were quite unconventional — Sonic rode around in the shell of Silver Sonic while Tails rode around in the shell of a SWATBot.
In Transformers: More than Meets the Eye, it is eventually revealed that "Ultra Magnus" is actually a form of Powered Armor that has been worn by several different Autobots over the ages since the death of the original Ultra Magnus. The idea was cooked up by a lawmaker, Chief Justice Tyrest, who was so fascinated with Magnus' reputation that he created the armor and spread a story about Magnus merely faking his death to create "an eternal lawman" controlled by him. The current wearer of the "Magnus Armor" is a small, unassuming 'bot with the somewhat unfortunate name of Minimus Ambus. It's also mentioned that the wearers of the Magnus Armor have to be "Point One Percenters", meaning that they have stronger than usual sparks that allow their bodies to integrate with the armor without their frames collapsing from the strain.
In the Firefly fanfic Forward, the Hands of Blue wear blue bodysuits underneath their normal suits that turn out to be a "low profile" suit of powered armor. It allows them to resist bullets and crossbow bolts, as well as allowing them to move with surprising speed and to hit extremely hard. With these suits, they are fast enough and strong enough that even River proves unable to match them in hand-to-hand combat. Fortunately, they aren't invincible, but it takes a lot of abuse to bring one down, unless you're Kaylee. Kaylee just squishes them with a power loader.
In Spirit Of Redemption the quarians and geth have made War Machine battle suits for the quarians to wear.
In Avalon, there are the Iron Suits, dummied down versions of the Iron Man suit used by Nerv.
Max DaCosta's Exosuit gives him the strength to rip machines apart with his bare hands in his quest to reach Elysium.
Later Kruger is outfitted with a sleeker model, which appears to be a fifth-generation exosuit. That said, the armor part of the suit is shown to be distinct from the exoskeleton that allows the protagonist to walk and move. Unlike Max's older model Exosuit, a third-generation exosuit; Kruger's has more extensive armour components, including better protection for his torso. Also, unlike Max who had to undergo extensive surgery for interfacing, Kruger only needed assistance from Drakey and Crowe, as opposed to an entire surgery team, in part because Kruger already has point-mounting implants on his body that the exosuit is attached to.
G.I. Joe: The Rise of Cobra features the "Delta-6 Accelerator suit", a powered armour that allows the wearer to outrun cars, leap over speeding commuter trains in a single bound, dodge missiles and climb buildings like a hyperactive monkey. Oh yes, and it's armed (quite literally) with an on-board Gatling gun and mini-missile launcher. They're used in a single scene by the two newest recruits; the story goes that the script was originally for a HALO movie or rip-off and that scene is an artifact.
The aliens in Independence Day use biological suits, but are still weak enough that Will Smith can knock one out with his bare fist.
Iron Man is unique in that it shows the trials and tribulations that would logically have to go with actually creating and testing such a device. The sound of Tony Stark screaming in terror as his suit(s) malfunction at inopportune moments almost becomes a Running Gag. To say nothing of the disastrous North Korean, Iranian, and the cringe-inducing Hammer Tech tests in the second film.
The Deconstruction goes further in Iron Man 3, showing what happens when a PTSD-burdened, sleep-deprived Tony Stark attempts to rapidly prototype dozens of different designs.
Harry Osborn wears one as the Green Goblin in The Amazing Spider-Man 2. The suit works in tandem with the spider venom in his veins and heals his injuries and ailments.
And if the supplementary materials are to be believed, the Vulture will be wearing one in The Amazing Spider-Man 3.
The Kryptonians all wear it in Man of Steel. It's bulletproof and has a self-contained atmosphere. Given the effect of Earth on Kryptonians, it seems doubtful that it enhances their strength to any meaningful degree.
The (sized more like Mini-Mecha) combat suits of the humans from The Matrix: Revolutions that carried big guns but provided very little protection. Word of God has said this is because the Sentinels could easily tear through any armor they put up, making it more efficient to simply leave them unarmored. It has been shown in Animatrix that the armored suits go down just as easily as their descendants, but prolong the suffering of the pilot.
The third Starship Troopers film, unlike the two prior installments of the film series, does include prototype/early run suits of Marauder Powered Armor, although almost as a b-plot, and they only get 5, maybe 10 minutes of action on screen. It was, however, awesome, and long overdue.
The Tuxedo could be considered a form of Powered Armor, as it enhances the wearer's reflexes, strength, and speed. In fact, the tuxedo mostly functions on its own with the wearer only required to select a particular action from the list. In the film, Jackie Chan's character can't fight. It's the tuxedo that does all the fighting, although in the typical Jackie Chan fashion. The final fight involves a battle between Jackie Chan's character (in a super-powered tux) and the Big Bad (who managed to get one too). Somehow, though, the Big Bad is much more proficient with the tux than "Jimmy", even though "Jimmy" has been walking around in it for most of the film, while the Big Bad put it on literally two minutes before the fight. It could be justified because the Big Bad is wearing the original "superspy" suit, while Jimmy's could have been an inferior version.
In The Wolverine, the Silver Samurai is a humongous robotic suit of adamantium armor to help him face off against Wolverine.
Harry Harrison's Bill the Galactic Hero spared barely a paragraph to mock Heinlein's armored soldiers, showing what happens when one tries to land in a swamp... thus proving he has no concept of what Heinlein's creations can do; as a self-contained environment, the soldier inside won't care if he's fully submerged. Hell, in the first chapter of the book the character realizes he's about to land in a river, which he avoids doing only because it'll cost him precious seconds to get out.
Dominant Species by Michael E. Marks centered on a Marine Rapid Assault Team in powered armor; the depiction took a serious (rather than fantasy) approach to the depiction of powered armor capabilities and vulnerabilities.
The "living-brain" Martians in H. G. Wells' The War of the Worlds came very close; their war-machines straddle the line between this trope and Humongous Mecha. They also had smaller non-combat work-machines into which they strapped themselves.
The powered suits in Diane Duane and Peter Morwood's Space Cops books.
The Wyverns from Into the Looking Glass start off as more Mini-Mecha, using only Earth technology, but later versions that also use Adar technology fit this trope.
The marines in David Weber's In Fury Born uses powered armor, as do the marines of Honor Harrington. Interestingly enough, we never see fights between forces equipped with Powered Armor in the Honorverse, only between the armored troopers and non-armored enemy forces. And at least one book included an example of what happens when you try to steathily land on top of a building in a heavy Power Armor suit. While they are portrayed as Nigh Invulnerable in this setting (at least against infantry), there has been at least one example of them being defeated by regular squishy unarmored personnel who catch them by surprise (and use a BFG).
Although present in Weber's and Ringo's Prince Roger series, they don't see a lot of use in the earlier books due to limited power and the environment of the Death World the titular prince's bodyguard unit is stranded on is exceedingly hostile to advanced electronics.
Joe Haldeman's classic, The Forever War, although in this case the suits had little armour.
From The Tin Man onwards, some of Dale Brown's books have featured the eponymous armours. They are noted as being resistant to bullets and eventually having limited jumpjet capability and railguns, but vulnerable to knives and missiles.
In C. J. Cherryh's Alliance/Union science fiction series, the Earth Company Marines (and, presumably, their Union equivalents) wear Powered Armor. The only really detailed description is in Rimrunners where ex-Marine Bet Yeager, late of the carrier Africa, has to repair and recondition a pair of suits and then teach a neophyte to use it.
Odd subversion in Peter F. Hamilton's Fallen Dragon: Skin suits are largely biological suits powered by the wearer's blood.
The skin suits also have Adaptive Armor features like using reserve supplies to provide the wearer with a Healing Factor, reconfiguring itself on-the-fly to provide enhanced protection against different types of damage or even accomplishing simple tasks without the host.
Hamilton's Commonwealth Saga novels, set in a different timeline to Fallen Dragon, feature much more capable non-biological powered armour. These suits, worn by conscript soldiers in a war against a genocidal alien Hive Mind, are super-strong and protected by force fields, while also sporting plasma rifles, kinetic missiles, tactical nukes and other heavy-duty firepower. Even so, they tend to get slaughtered in a pitched battle with the aliens, who outnumber them several million to one.
Space and combat suits in the Perry Rhodan universe tend to come with basic comm gear, flight capability and some kind of force field for protection at a minimum; additional sensors, life support, fairly sophisticated built-in computers, and stealth features like invisibility are also found more often than not. Perhaps ironically, one thing that these suits are not primarily intended to function as is actual body armor; that's what the force field is for. Likewise, weapons tend to be external (and frequently hand-held) rather than integrated into the suit.
In the Vorkosigan Saga, Miles ("Mr. Naismith") Vorkosigan was too short to use the average powered armor suits of his universe, but acquired a "petite" size in his first mercenary venture. He had to have the techs adapt the plumbing to fit, though, as it was originally for a female. Later in his career he's worn powered armor so often that the equipment's left a mark on his forehead.
In Iain M. Banks's Culture novels, powered, intelligent armor features in Matter and The Hydrogen Sonata. These armor suits are pretty nifty even by the Culture's high-tech standards, providing impressive protection, massive physical strength and a significant degree of AI autonomy.
And as a protagonist in the short story "Descent" in The State of the Art, and as a device to protect the wearer in a high-gee hazardous environment populated with super-strong Starfish Aliens in 'Excession''. The latter is technically a glorified spacesuit, but anything that provides super-strength and plenty of damage resistance can easily be used for military purposes.
In UseOfWeapons the protagonist also wears powered armour/spacesuit at one stage, which he requisitioned from the Culture (though he very pointedly does not want a sentient suit). At one point he turns up his suit's strength in order to lift a large stone object but has to be very careful that he's in the correct stable and braced position.
In Ian Douglas's Heritage/Legacy/Inheritance trilogies, the USMC has these. They start out as glorified spacesuits and end up being a combination starfighter/power armor/drop pod with enough features to make the Mjolnir VI look like a Model T.
The protagonist of Gary Gibson's Stealing Light has some sort of Latex Space SuitInstant ArmourPowered Armour she stole from some aliens. If they knew about it, they'd want it back. Alas, it's implanted in place of one of her lungs (at least).
The novel Revelation Space by Alastair Reynolds features powered armor suits that can fly to a planet's surface and back to orbit, extrude powerful weapons, withstand heavy damage and change their shape; oddly, they aren't mentioned in later books, even if they would be useful.
They're mentioned as being exceedingly rare and powerful by one character in that novel. Chasm City is largely empty of serious high-tech of that kind. Redemption Ark and Absolution Gap don't contain any infantry combat of note. Similar armor is, however, used in Reynolds' novella Diamond Dogs, when a group of characters uses it to gain entry to a hostile alien structure.
The Diamond Age has "Hoplites", military combat exoskeletons that seem to take the place of infantry and tanks in serious warfare. Some models are notable in that they allow the wearers to go Roof Hopping.
The Stormlight Archive has Shardplate, Lost-Magitek powered armor. It magically fits itself to any wearer, and in addition to being extremely tough (it's the only armour that a Shardblade doesn't cut straight through like water) and increasing the wearer's strength and speed. If it gets damaged, it can regrow itself if it is supplied with stormlight.
The Eternads of Robert Buettner's Jason Wander and Orphan's Legacy series.
Max Barry's Machine Man makes use of this when Carl the security guard needs an exo-suit to hold up his titanium sledgehammer arms.
E. E. “Doc” Smith's Lensman series is probably the Ur Example. Galactic Patrol, the first Lensman book to be published, ends with the hero wearing a super-tough high tech suit of armor which, despite having a built-in inertialess drive, was not actually powered. True powered armor first appeared in Children of the Lens, serialized in Astounding magazine in 1947 and published in book form in 1954; the powered armor was a Lensman Arms Race outgrowth of the series's earlier armor suits.
Confederate Marines in the Confederation of Valor series use a low-key version of this. Like all their tech, the armor has to balance the benefits of powered armor with being light and flexible enough not to impede movement if the enemy uses EMP to knock out the electronics.
In the Magic: The Gathering book The Thran, the Halcyte Guard get a form of powered armor: they're lighter and tougher than conventional armor, mold themselves to fit the wearer, and the helmets even have a magical form of radio communication. The only real downside is that they're just as vulnerable to their own weapons as conventional armor is, and their swords can already slice through metal as if it were butter.
Used in Tom Kratman's Caliphate, although not in the traditional sense. The suit itself is more of an armored exoskeleton, but the ones worn by the Suited Heavy Infantry can have armor added to them to increase their protection, or reduced to enhance speed and endurance. It's explicitly pointed out when they're introduced that they do not make the wearer invulnerable, just that the user requires more effort to kill.
All You Need Is Kill refers to its powered armor as "Jackets." They're the only way that humans can really fight the alien Mimics at close range, due to their toxic biology and hardiness.
In The Hoplite by Robert Reed, the marines sent out to pillage the surrounding territory use a suit of high-tech powered armor, with a railgun in one arm and control systems to call in drone and artillery strikes.
Sergey Lukyanenko's Line of Delirium duology features the protagonists wearing power armor during their raid on the Imperial orbital base. Most Imperial soldiers also wear power armor, though. Various functions are controlled by the chin. In particular, the protagonist puts on a type of armor that can generate a plasma shield around it, not for protection but in order to walk through walls, even space station bulkheads. Melting walls with your entire armor drains the power supply, though. Apparently, any powered armor can be quickly put on and taken off without any special tools.
In Please Don't Tell My Parents I'm A Supervillain, this is Mech's primary schtick. He's a Mad Scientist, and the armor is his first and greatest invention. It's highly modular, capable of adapting to any device plugged into it, not to mentions millions of layers of microscopic ablative plates that let it adapt to any threat. It's also the most obvious reason that he's a clear Iron Man expy.
Live Action TV
The Daleks from Doctor Who are basically evil lumps of flesh encased in salt-shaker-shaped personal tanks that function the same way Powered Armor does for humanoids.
The Cybermen, both the original and the Alternate Universe version in the new series, were originally designed as a suit to increase the vitality and lifespan of the wearer.
The Ice Warriors wear powerful armor in Earth's atmosphere, and in "Cold War" it could act autonomously from its user.
On Stargate Atlantis, the Lost Tribe faction of the Asgard wear humanoid-shaped power armor suits that provide them with mobility, protect them from hazardous environments, and come equipped with blasters and built-in energy shields. They're also conveniently designed to automatically adjust to the wearer, so other races that aren't bigger than the armor's maximum size can wear them.
This is extremely convenient, given that that all the Asgard we have seen are half the size of the average human, and as they are a race of clones, we can reasonably presume that their stature is pretty uniform.
Intimidation probably has something to do with it. Admit it, you'd be half as afraid of someone wearing armor half your size than someone who is larger. Also, if it came to hand-to-hand combat, a smaller power armor would probably be at a disadvantage.
The same goes for most man-made Kamen Riders, with the prime example being IXA, and the earliest being G3.
Kamen Rider G3, Kamen Rider G4, G3-Mild and V1 in Kamen Rider Agito are the earliest examples. Some tie-ins include Kamen Riders G2 and G1 with more similarity to Kamen Rider Kuuga.
All of the Rider Gears from Kamen Rider 555, especially Delta which can be used by normal humans but it's powers are addictive.
Kamen Rider IXA is an interesting example as it actually goes through research and development. The version used by Otoya, Yuri and Jiro in 1986 is a prototype prone to overheating while this problem is fixed in the 2008 version used by Nago.
Kamen Rider Birth is similar as you get the actual Birth armour and Proto-Birth it's slightly weaker prototype.
A Villain Of The Week develops an exoskeletal suit that allows him to move as fast as The Flash. Then his control chip gets damaged. Cue the "bug on its back" sight.
Ever since it first appeared in Power Rangers in Space, the Battlizer power-up has usually been a staple upgrade for the Red Ranger and occasionally other Rangers in Power Rangers. Of course, the source of their Powered Armor varies by series.
Also naturally, being Warhammer 40000, Powered Armour is merely where it begins, with more extreme versions for everyone. Space Marines have Terminator armour equipped with personal teleporters and weapons including-but-not-limited-to arm-mounted gatling guns and giants hammers that spark lightning with every hit, as well as Centurion armor that is officially a Meta Mecha for "normal" Powered Armor, Tau have suits armed with missile launchers and a pair of enormous railguns, Chaos Marines have suits fused to their wearer that spontaneously spawns any desired weapon and even its ammunition, while Orkz prefer to simply stick on lotsa pointy bits and give it More Dakka. The Grey Knights even get Powered Armor for their Terminator Powered Armor in the form of the Dreadknight suit.
Worth mentioning about the Tau Empire is that their standard power armour makes their soldiers about as big, strong and resilient as your average human dude. Albeit a bit more bulletproof. And their big suits are actually Mini-Mecha.
That can fly.
Spyrers are ordinary humans (from the Spyre, natch, of Necromunda's Hive Primus) who use Powered Armor to achieve Clothes Make The Super Man, and it's hinted that their ancient, possibly alien suits are actually The Symbiote, as they literally grow stronger and more powerful as the wearer gets more used to them. These are unusual artefacts belonging to noble families rather than standard military gear, however.
The Eldar have an interesting variation, Exarch armor doesn't make the wearer stronger or faster, but instead gives him or her access to the skills and memories of previous wearers of the suit. The Phoenix Lords operate on the same principle.
While you wouldn't expect it, Warhammer Fantasy has Chaos Armor, which acts like magically-powered armor, rivaled only by the Dwarven Gromil armor (which is also enchanted) and the Empire's full plate armor.
The Albion campaign expansion featured the High Elf "Armour of the Gods" that was suspiciously identical in effect to Warhammer 40,000 wargear Power Armour.
WARMACHINE features military commanders wearing technomagical suits called Warcaster Armor. Additionally, the empire of Khador reserves valuable robot cyberbrains for only their largest war robots, with the role of light armor being filled by soldiers sturdy enough to wear Man O' War suits. There's even a soldier wearing this bulky powered armor on horseback.
And the horse gets its own powered armor to compensate.
Rackham's AT-43 features suits of powered armor for nearly every army (including Space Gorillas).
Rifts sings "The Girl is Mine" with Warhammer every Saturday on the subject. It also enjoys playing with the trope to a degree usually not seen. Many units that one might classify as powered armor from their size, like the Triax Ulti-Max and Coalition States Terror Trooper, are in fact very small piloted combat robots instead of worn suits, while some worn suits such as the Glitterboy are simply so powerful as to intrude on combat robot territory. The Lunar Colony's VRDS system takes it Up to Eleven by allowing one to wear a combat robot like it was power armor.
The books even state (at least for the Terror Trooper) that such suits blur the line between Power Armor (Rifts doesn't use the -ed) and Giant Robots. The defining characteristic seems to be that Power Armor is one man, while Giant Robots need a crew of 2-5.
Traveller had "Battle Dress" armor, which was pretty much an Iron Man suit for every G.I. in the Imperial forces. Besides its protective function, the powered armor was the only way to handle the recoil and backblast from the awesome FGMP-15.
FGMP-14. FGMP-15 was the model with the anti-grav recoil module, which meant you *didn't* have to wear Battle Dress to wield it. However, the FGMP-15 costs almost as much as an FGMP-14 and Battle Dress put together.(though the cost of the avionics suite that went into the Battle dress dwarfed the cost of the FGMP - it made economic sense to run a xray lazer or two as point defense )
While Battletech is best known for its 'Mechs, there's also Powered Armor down there, ranging from simple suits worn by special-forces troopers, to one-ton monsters capable of taking down a 'Mech in teams and withstanding their weaponry, to two-ton four-legged machines more piloted than worn, with enough firepower to shame an infantry company.
The Clan genetics program has culminated in the birth of huge humans to pilot their massive Powered Armor; the Elementals. Even one outside of the likewise-named armor can dismember an armored opponent with their bare hands, and the massive brutes top seven or even eight feet tall. Elemental armor fits above into the 'one-ton monster' variety, a sizable fraction being the pilot itself. Examine for yourself a cutaway diagram of the standard Clan Elemental battle armor◊.
Much like the larger Battlemechs, the powered armour technology is even present in the civilian market throughout the Inner Sphere, with uses ranging from police and rescue work to forklift truck analogues (which was presented as a clear homage to Aliens).
Given Exalted's attitude towards the Rule of Cool (namely, if the concept exists and is sufficiently awesome, put it in the game), it should come as no surprise that there are many, many examples of this to be found in Creation.
Warstriders are arguably closer to a Mini-Mecha. There is also powered armor, from Gunzosha (which can even be worn by mortals, at the cost of a mere half their lifespan) to Celestial Battle Armor (which is as tough as Superheavy Plate armor, far less restrictive, and can usually fly).
Cyberpunk 2020 introduced an entire subclass of Solo called 'PA Trooper' who's only reason for existence was using various heavily-armed suits of Powered Armor. The supplement 'Maximum Metal' was mostly devoted to their design.
Although Mekton primarily focuses on Humongous Mecha, the scaling rules provide two different power levels for powered armor - the smaller Human Scale (which are light powered suits on the Iron Man - Bubblegum Crisis axis) and larger Roadstriker Scale (which are slightly larger and bulkier, on a rough size and mass scale with a large motorcycle to a light truck).
Pretty much every side in Cthulhu Tech is a big fan of powered armour. Of course, how dangerous they are is entirely dependent on what they're up against. They're basically invincible to infantry level firepower, requiring specialist anti-armour weapons to scratch, while carrying guns which can kill a normal human/Migou/Deep One with a single shot. On the other hand, up against anything larger, they're the Glass Cannon, who tend to get crippled if they get hit at all.
Genius The Transgression lists this as one possible product of the defensive Prostasia axiom (although you have to use the travel axiom Skafoi to make it fly and the weapons axiom Katastrofi to give it weaponry).
And the Exelixi axiom for super-strength... a good suit tends to be an expensive investment for a veteran Genius. But oh so worth it.
Powered Armor characters are common in Champions. One of the most powerful human villains in the official game universe is Doctor Destroyer, who wears a suit of powered armor that lets him take out (spelled "kill") whole teams of superheroes.
A fair number of powered armor suits survived the Last War in 'Deadlands: Hell on Earth.' The trick isn't so much finding one as getting it to work for more than fifteen minutes in the Scavenger World left After the End.
GURPS: Ultra-Tech has a slew of them. The most powerful is the TL12 "Warsuit" which, just for starters, is armored with layers hyper dense regenerating metal alloy and multiplies an ordinary person's strength 25 times over. There's also the clever "Exo-Field Belt" which is Powered Armor made out of nothing but forcefields.
Mutants & Masterminds: while the Device power can be used to represent anything from the hammer Mjolnir to a Green Lantern Ring, the battlesuit is one of the coolest uses. (Especially since there are no restrictions on what you can give a battlesuit save the points available, meaning that it's not impossible to build a suit that lets you warp time.)
To expand, there are two types of device. Those you can remove with a disarm check (weapons) and those you can only remove from someone only when he's unconscious. This include powered armors.
It is technically possible to do this in Shadowrun by combining multiple levels of Mobility Upgrade, Strength Upgrade, and Hydraulic Jacks on a suit of milspec or modern Samurai armor, but your GM will not be pleased.
The d20 Modern supplement D20 Future features Powered Armor in a few different forms. The standard version is a fairly basic version, providing a sealed, protected environment and enabling flight, but not giving the wearer any offensive abilities. Blurring the line with Mini-Mecha, the Mecha chapter includes rules for Large size Mechs (roughly 9-11 feet tall) that act more like the Marauder suits from Starship Troopers; they grant the wearer a sizable Strength bonus (+8 for the smallest, when a normal human's absolute maximum is 18) and serve as mounting brackets for heavy armor, shielding, and weapons too heavy for a normal human to wield (such as .50 caliber chainguns and rocket launchers), with options for sealed environments, flight capability, and other neat doodads.
Fading Suns has some powered armors, but these are rare and it's hard to get your hands one one. The most accessible ones are powered just enough to compensate for their weight (allowing you to wear it with no penalties as long as it has power), better ones outright enhance the wearer's strength.
In Sentinels Of The Multiverse, Bunker wears a suit of advanced, US military-engineered power armor capable of "wielding the firepower of an entire battalion." And going by the amount of dakka he can lay down once he arms up, that's not hyperbole.
The Singularity System features powered armors which allow personal-scale combatants to effectively be treated as vehicles for vehicle-scale combat.
In Chapter 4 "Time Out" the Mandrill's soldiers wear armor based on SHIELD's Mandroid armor.
Chapter 5 "Nightmare in New Guinea"
The PCs are at an audience with the Mandrill when he decides to capture them. He and his soldiers open fire on them with neurostunner pistols that cause unconsciousness. If that fails to take them down, several soldiers wearing the special armor from Chapter 4 will appear and attack.
While the PCs are escaping from Mandrill's base, one his soldiers wearing a battlesuit attacks them. She uses a neurostunner built into her armor to knock them out.
The Golden Armour from BIONICLE, although it's more of a fantasty variant than most of the science fiction examples on this page. It has the power to incinerate Antidermis, including all the Kraata inside Rahkshi, and permanently transfers the Kraata's powers to the user. The Toa Nuva's Adaptive Armor also develops different characteristics to enhance the wearer's performance depending on the environment.
There's also the Exo-Toa which, as the name suggests, are an exo-skeleton armour for a Toa. If needs be they can function independently making them robots as well as Power Armour.
Master Chief's MJOLNIR armor is one of the most well-known video game examples. A fusion-powered, energy-shielded suit of death that makes the operator so powerful that he can flip tanks over with little effort. It is literally too much for a normal human to take, which is why only SPARTAN II soldiers, who are biologically and cybernetically enhanced to post-human levels, can don the suits.
Halo also has the Arbiter, who wears power armor that's functionally the same as Master Chief's, but with a cloaking device and the added bonus of being a legendary religious artifact. Minus the artifact status, every other Elite in the series wears armor pretty much identical to it; ironically, the Arbiter suit is an antiquated relic in comparison to the more modern Covenant standard-issue suits.
In addition to the SPARTAN-II's Mjolnir Mrk. IV-VI armor suits, Halo features SPI (Semi-Powered Infiltration) armor worn by SPARTAN-III's and arguably the Cyclops Exoskeleton (though that's designed more for repair and heavy utility work than combat).
The manual for Halo: Reach implies that combat Scarabs are not so much vehicles piloted by a Lekgolo worm colony (as fans previously assumed) as a huge Lekgolo worm colony in a similarly massive suit of Powered Armor. For some idea of the scale here, the combat Scarab is adapted from a form of fully-mechanical mobile mining platform. They also normally carry a complement of more normally-sized infantry to protect against boarding attempts and man mounted guns.
The Halo Legends short Prototype shows us another one: the HRUNTING/YGGDRASILMark I Prototype Armor Defense System, a weapon so powerful that it made a normal soldier amount to an entire battalion. Before it could be mass-produced, however, the UNSC ordered its destruction to prevent it from falling into enemy hands, as the research station was being overrun; the guy assigned to do it took out a couple hundred Covenant soldiers, as well as a few fliers and tanks before he activated the self-destruct, which in itself resulted in a nuclear explosion visible from orbit.
Forerunners wore suits of armor for their entire lives, which, among other things, gave them virtual immortality, their own personal AI (or Ancilla), and took away the need to sleep. Warriors wore a varient known as "Combat Skin": in Combat Evolved, 343 Guilty Spark claims that Chief's MJOLNIR would rate Class 2 on the Combat Skin power-scale, and recommended he switch to Class 12 or higher. Just how outclassed the MJOLNIR armor is in comparison to a Forerunner Combat Skin is clearly demonstrated in Halo 4, where the Didact handily throttles the Master Chief - repeatedly.
Metroid's Samus Aran is the other quintessential example.
Samus's suit itself is essentially a modified (for humansnote Technically Samus was modified a bit herself by the Chozo so she could survive on their planet but she's still a very different shape to a "normal" Chozo warrior.) version of a Chozo warrior's armour. Of course, being a race of Actual Pacifist aliens, Samus is the only Chozo (by adoption, of course) to take up the mantle for hundreds of years.
Tribes has everyone wearing a suit of Powered Armor, complete with Jet Pack. They come in three sizes: light/scout, medium/assault, and heavy/juggernaut. They can be further customized with a variety of packs that draw from the armor's energy supply (or in the case of the energy pack, give increased recharge rate), such as a shield pack, repair pack, cloaking pack, or sensor jammer pack.
Planetside has the MAX (Mechanized Assault eXoskeleton) suits. They're extremely powerful and well armored, but slow (until you activate the sprint mechanism, disabling your weaponry), turn slowly, and they can only carry one weapon.
Turrican's protagonist wears the eponymous suit, which has plenty of weapons and a spiky ball mode not too much unlike Samus Aran's.
Opposing Force reveals that while the US Military didn't adopt the suit itself, they adapted the reactive armor aspect, in the form of the Powered Combat Vest.
StarCraft has several types, most of them Terran. The only reason the Terran infantry stands a chance against the Zerg is that they're in that armor that makes a regular human about as strong as a Hydralisk (and just as large); the guns also help, letting them draw first blood against Zerglings. Protoss Zealots get powered armor as well, but theirs is more geared around a plasma shield and cybernetics than actual armor. It makes the Zealots capable of killing 3 or 4 enemies each when properly used.
In the sequel, you get to see it up close. Marine CMC suits aside, Firebat and Marauder armor systems are frikkin' huge, more like Mini-Mecha than anything else; almost the size of a tank.
In fact, the Marine suit straddles the line with Mini-Mecha as the Marine's hand is actually inside the suit's forearm while the suit's hand is fully mechanical.
Section 8 has players using Powered Armor - which allows them to 'burn in', that is, rain themselves from 15000 feet in the air to the ground. In ten seconds. Among other things.
Metal Gear Solid. Although in the original the Cyborg Ninja was a cyborg instead of a guy in a Powered Armor, in the sequel it is this way.
And how does ex-president George Sears AKA Solidus Snake stay limber despite premature aging? Power Armor.
His Arsenal Tengu goons wore something similar, just without the tentacles and with a gas mask.
The Beauty and the Beast unit in number 4 counts, too as well as the form fitting suits worn by the Frogs that allow them to leap over 2 meter walls in a single bound.
One brief rail shooter scene in MGS4's South America features actual powered armor mooks. They don't show up anywhere else.
Snake himself uses powered armor in Metal Gear Solid 4: his OctoCamo suit augments his prematurely aged muscles, allowing him to operated as if he were a man of a much younger age. Without it, he finds it difficult to even stand.
In Revengeance, Raiden's original combat augmentations were externalized in a bodysuit (a la Gray Fox) while he used a more humanlike body to facilitate bodyguard duty.
Fallout has power armor, and its sequel Fallout 2 has an advanced model powered by a portable fusion generator.
The third installment, despite Bethesda's tendency to feature unrealistic armor , has a tuned down Powered Armor, even though they're still following the original design.
Fallout: New Vegas sees the return of truly effective power armor, with the dispensing of damage resistance (multiplicative) and implementation of damage thresholds (additive). As well as the return of the above advanced model suit (now known as Remnant Armor).
S.T.A.L.K.E.R.: Shadow of Chernobyl has a full Exoskeleton armor near the end of the game.
Or a couple hours in, with the most recent release in the franchise.
One must question what the powered armor-user thought would happen when he decided to become a technologist (as using steampunk powered armor heavily implies he's become) considering that the universe operates on Magic Versus Science logic and the Hidden Elf Village is a community of master mages.
Killzone and Killzone 2 give us the Heavy Assault troops (Abbreviated to just "Heavies" in the second game) who wear big bulky Faceless suits of powered armour, often carry some of the heavy hitting weaponry, and soak up tonnes of punishment before finally dying (especially in the second game).
But before that, a couple of little-known games called Hero Senki and Super Hero Sakusen combined Tokusatsu heroes like Kamen Rider and Ultraman with Gundam pilots wearing Powered Armor versions of their Mobile Suits, though in Super Hero Sakusen it was implied that the Gundams and original mechs were full-size. Don't think about it too hard.
Hero Senki also featured the first appearance of one of Banpresto's most wide-ranging original mecha, the Gespenst, in Powered Armor form. It later got upgraded to a Humongous Mecha in Super Robot Wars 4.
Mass Effect has this, to an extent. Regular armor is still powered, but it can be upgraded with a more powerful exoskeleton that increases melee damage. (Especially noticable if they already had something that boosts melee attacks, like the assault training talent.)
Mass Effect 3 has the multiplayer N7 Destroyer, who wears a "T5-V Battlesuit". This includes a shoulder-mounted rocket launcher, a Shockwave Stomp and a "Devastator Mode" that increases fire rate and weapon damage at the cost of turning you into a Mighty Glacier. The turian DLC characters wear armor similar to Garrus - except with a Jet Pack function.
The Inferno and Collector armor suits, the former re-used in multiplayer as the N7 Paladin, are built to give the wearer some of the traditional benefits of power armor. In the Inferno armor's case, you can actually see motors on the elbows and knees.
Crysis pretty much centers on the deployment, uses and functionality of a semi-realistic, 2020's Power Armor suit. This "Nano-muscle suit" or Nanosuit is designed like a materials scientist's wet dream, with a reactive fabric that can, in turn, make the user bulletproof, super-fast with enhanced reflexes and dexterity, super-strong (and by that we mean "bring-a-whole-house-down-with-nothing-but-your-fists" strong), or invisible. It also includes a large suite of sensors, scanners, emitters and recording equipment, and a medical system that can bring the user back from the brink of death in a few seconds. It's as close to being Superman as one is likely to get in this century. The only problem is, just like today, the power source. Exertion of any of the four suit functions drains power very quickly (especially the cloak, which increases power drain with movement speed). The capacitor banks recharge quickly, but there are significant intervals of vulnerability, especially outside of Armor mode.
US Army Intelligence also seems to thinks that the larger alien machines, the flying Scouts and giganticHunters, are actually a sort of powered "exosuit" for the rather feeble, jellyfish-like Aliens. In Crysis 2 this is made clearer, as the main enemies are mollusk-like alien organisms granted rigidity and legs via an advanced robot exoskeleton.
The Nanosuit 2 in the sequel takes this trope and kicks it into orbit. The suit is more of a symbiote that can fully integrate with the user on a molecular level, growing its nanofabric into wounds and replacing vital functions, essentially keeping a corpse not only alive, but in combat capacity far beyond that of a normal soldier. It also features an advanced AI that can link up with your brain and save a copy of your personality if you actually kick the bucket. All of the previous functionality is ported over and improved as well.
The best (and most expensive) form of armor tech in any turn-based X-COM game is generally this. Flying Armor, Magnetic Ion Armor, X-COM Armor (sic) all apply. The first two even give you unlimited flying, allowing for much more freedom in moving around the battlefield. Sadly, these suits do nothing against any of the game's Demonic Spiders.
Except for Chryssalids, which can't attack you if you're on air. Advisable not to hover too near them in any case.
X-COM Armor in Apocalypse is not in fact powered, but simply extremely light. Marsec Armor on the other hand...
Note that this the opposite of how powered armor worked in the first game: The Power Suit (the penultimate armor in the first game) consists of thick armor plating and a power source that just restores normal mobility and strength to the user. With nothing but heavy armor plates and a sealed environment, this is just about as basic as powered armor gets. The Flying Suit is the same design with flight capacity.
Spiritual SuccessorUFO After Blank has two varieties of powered armor in the first game. Human powered armor is the standard version of this trope, but since it was in prototyping before the alien invasion, it has several drawbacks, most notably the fact that the user cannot run. However, carrying capacity is vastly increased, and the powered armor is the only way to use deployableweapon turrets. On the other side of the equation is the Reticulan bio-armor, which doesn't enhance statistics, but actually acts as a symbiotic armor layer (some of which can project a personal shield) powered by, well, whatever a symbiotic armor layer eats.
2012's XCOM: Enemy Unknown features powered Titan and Archangel armor, the former being the heaviest armor in the game and the latter being jet-pack-equipped flying armor.
The 2013 Enemy Within expansion adds giant MEC armor, which turns its users into walking tanks with built in flamethrowers, power fists and grenade launchers; on the downside, it can only be used by special cyborg troopers who must have all four limbs amputated before they can use the armor.
In XCOM: Enemy Within there is an enemy unit called a Mechtoid, which is a Sectoid (one of The Greys) in a large mechanized suit.
Most of the units from Tiberian Sun and Tiberium Wars, particularly the GDI Commando and Zone Trooper units from Tiberium Wars.
The Wolverine looks more like a Mini-Mecha (and does have an entry in that trope page) and is built from the vehicle factory, but is described as powered assault armor in both of the two games it shows up in. It also uses infantry voice clips in Tiberian Sun.
With the most recent expansion pack in the series, Cryo Legionnaires as well. Their suits are noted as making tesla troopers' look downright primitive, and give them vastly increased speed and the ability to walk on water in addition to the usual protection.
There is also Desolators, whose suit doubles as life support for their unlucky pilots.
According to what is All There in the Manual, the Alto Angelo enemies from Devil May Cry 4 are what happens when demon-ascended members of the Order of the Sword use the Bianco Angelo Animated Armor suits as Powered Armor, although this does not fully explain the different capabilities of the former. Then again, demons and magic.
Arcana Heart: One of Mei-Fang's supers has her pulling out a Powered Armor from... somewhere and shoulder-tackling her opponent while wearing it. If Mei-Fang has enough for a second super attack, she could then follow it up with a blast from its shoulder canon.
Mega Man ZX: The Biometals? The Biometal envelops the Chosen Ones with a Powered-Armor based on the previous character the Model was based on. Of course, this is a topic of contention among several fans.
Depending if you consider it powered or not, Bioshock's Big Daddies wear armored diving suits. The game does state that they require certain circuit boards (R-34s) to run properly, that and the drill needs fuel, as well as the helmet lights. Obviously the power has to come from somewhere, and it certainly doesn't come from the guy inside. Considering the Lightning Plasmid aslong as the big daddy is supplied with eve this troper see no issues with him being able to power his own suit.
In Star Wars: Jedi Outcast Galak Fyyar wears a huge battle suit with lightsaber-resisting cortosis, shield generator and other toys. There's also the Shadowtroopers, dark Jedi also clad in lightsaber-resistant armor. Not that this poses a problem for Kyle Katarn.
Jedi Academy adds Hazard Troopers, who are typically armed with one of the game's two BFGs, armored enough to take multiple lightsaber strikes, and can smack the player away if they get too close.
Well, they didn't so much add them as bring them from the first game, Dark Forces, where the main mission of the game is to destroy the factory making the armor for droid Dark Troopers, but the final stage is power armor for the General in charge.
In City of Heroes this is pretty much the entire idea behind the Technology origin, and the Arachnos Wolfspider Archetype has powers based around giant suits of armor.
Some enemies start building up robotic armor as well, especially the Longbow and Arachnos soldiers (though the former eventually drop the armor and get superpowers instead.)
In Star Trek Voyager: Elite Force, all members of the hazard team wear highly advanced armor with shielding and regenerative capabilities, as well as lots of fancy electronics. When you pause the game, you can see a diagram of the armor that they use.
Human marines (which are not shown in-game, but appear in a splash/loading screen) are supposed to use this. Though in the actual game they're just used for boarding actions, instead of ground combat they use Orbital Bombardment.
However, one of the spin-offs in beta, Sword of the Stars: Ground Pounders is all about ground combat and the human and Tarka infantry appear to be wearing armor at the very least.
The Suul'ka are Liir Elders who wear Powered Armor that allows them to live in space. The armor is a very crucial part of the backstory since the main reason the Liir are so advanced is because the Suul'ka psychically enslaved the younger Liir to jumpstart an industrial revolution solely to build those spacesuits.
One of the ground troop technologies available in the Master of Orion series.
Syphon Filter 2 had the Emergency Defense Squad from the Bio Lab Escape level who can only be killed by explosions. Chance and Rhoemer (in a flashback in part 3) both wore Nigh Invulnerable high-impact kevlar armor. Ditto for Anton Girdeux in the first game.
System Shock 2 has a notable example in that although the powered armor is the best armor, it - surprise! Requires power and will prove no protection when the power runs out, until it's recharged again. And in the later levels of the game, you can go a very long time without finding a recharge station...
The Sacred Armour of Antiriad (from the old ZX Spectrum game of the same name). Naturally, it is an Anti-Rad suit with a "gravity displacer" and a "pulsar beam" launcher.
HACS (Heavy Armour Combat Suits) that the terrorists use in Razing Storm generally serve to be the game's Giant Mooks.
The Silencers from Crusader have a kind of powered armor as their uniform. The armor itself doesn't (apparently) increase strength or speed, but it can mount a dizzying array of technological devices, including wide-spectrum vision, targeting sensors, personal shielding (against weaponry and hard radiation), and also apparently comes with a backpackof holding standard. Oh, and it's apparently made of polonium, which (among other things) is ridiculously radioactive.
In the Dead Space games, everyone wears a form of powered exoskeleton called RiG (Resource Integration Gear) that serves to monitor health and personal resources, and manages communications and interfacing with other machines and computer systems. On top of the standard RiGs, the games' protagonists usually wear an enclosed suit of armor, complete with Collapsible Helmet. These suits have specific profession-based designs (Soldier, Engineer, Archaeologist, Miner, etc), but regardless of the individual model, they are all vacuum-enabled with an oxygen supply, zero-gravity boots and thrusters and have incorporated armor & weapons management systems. So even a lowly systems engineer has a chance in the unlikely event of a SpaceZombie Apocalypse.
Relatively late in Silent Storm, you gain access to Panzerkleins, developed by THO scientist. They're as ridiculous as they sound, and if you want to finish the game, you'll need all of them you can get. Panzerkleins make your soldiers immune to anything but armor-piercing rounds, heavy explosives, and energy weapons. The armor itself is very difficult to destroy. It's much easier to kill the pilot and take it for yourself. The Big Bad even has a flying variant.
Prominently featured in Conduit 2. Players can also customize their armor loadouts for different attribute buffs.
Time Shift had a pretty nice suit, a bit like The Master Chief's, except you didn't need to be superhuman to use it, but still made you stronger, faster, provided shields, in addition to providing the power to slowdown time, stop time and reverse it (like 10 seconds).
Featured prominently in Vanquish, which basically allows the user to go Crazy Awesome. Comes with a shapeshifting gun!
The Demonica in Shin Megami Tensei: Strange Journey is designed to withstand the environment of the Schwartzwelt. Its Adaptive Armor abilities allow it to increase the wearer's performance to superhuman levels, its HUD can be enhanced with exploration and combat feeds, and early on acquires the Demon Summoning Program, allowing the user to control creatures of eldritch power. The only catch is that there are no on-board weapons - you have to carry an issued gun and knife. There's nothing stopping you from later upgrading those too, though.
The idea of powered-armor-wearing shooter heroes is directly ridiculed in Duke Nukem Forever. Duke is offered some oddly familiar power armor but turns it down on the grounds that "power armor is for pussies". In fairness, since Duke can kick an alien's head off, rip open metal doors with his bare hands and survive weapon damage using the power of his ego, he hardly needs it.
Arguably, almost all armour in every RPG where characters receive bonuses other than protection (such as increase to attributes such as strength and agility)from their equipment is this. Naturally, this depends on whether items are actually enhanced or enchanted to provide benefits or it's a case of Gameplay and Story Segregation and the bonus provided is purely mechanical.
Aleste Gaiden puts protagonist Ray Waizen in a suit of high-speed combat armor which can jump 30 meters In a Single Bound and comes equipped with twin gravitational-energy swords.
In Star Wars: The Old Republic Bounty Hunters and Troopers utilize power armor to protect themselves, and also allows them to become a mobile artillery. Sith Juggernauts and Jedi Guardians also make use of such an armor, but since they are close combat specialists, it's more for their protection than anything else.
ESWAT has the I.C.E. suit, worn by police officers who graduate to the E.S.W.A.T. level.
Girl Genius: This suit, while not armored, certainly does all the other things that power armor is supposed to do.
In Schlock Mercenary, Tagon's Toughs (and some other military/mercenary groups) all wear poweredclothing, which can deflect small arms fire, increase strength, offer emergency life support, and fly. And that's just their knocking-around uniform; their big hard-shelled field combat armors improve on all those abilities multiple times over and add huge shoulder-mounted cannons to boot. (Though that's the latest stage in a zigzag process; the low-profile suits were a strict upgrade from the original bulky hardshelled suits.)
Tessa and the rest of her squad of super soldiers in S.S.D.D are field-testing experimental powered armor that is controlled using Nano Machine implants as of the current arc (which is backstory), she has been seen using the armor in other story arcs that take place later (from her perspective).
Dragon Ball Multiverse: The Heliorians from U19 use them to compensate their lack of ki abilities, and they are INCREDIBLY effective.
Many characters from the Global Guardians PBEM Universe wear Powered Armor. Arrowstar, Scarab, Detroit Steel, Doctor Tomorrowland, Talos, Cyclone, Lawgiver, Liberty Belle, Piping Shrike, Ironclad, T-72, Rainbow Knight, Industry, Iron Mask, Steel Tortoise, Dragonfly, Horus, Solar Centurion, Chevalier, Haephestus, The Templar, To, Tetsuronin, Resolute, Ogun, Myrmidon, the Iron Amir, and Lancelot, just to name a few.
The Iron Legion is an entire team of villainous Powered Armor wearers.
The GIACA from Welcometo Omega is a good example, but it's not strictly speaking power armor. It's a lot like the Venom symbiote, built into the wearer's genome and its protection based off their reaction time.
The armor worn by the Dimensional Guardians in the web fiction serial Dimension Heroes.
Building your own suit of power armor is apparently a pretty common ambition of gadgeteer and devisor students at Whateley Academy. (In a bit of a subversion, the blind devisor Jericho is working on a life-saving powered armor super-suit for EMTs and medics to wear on battlefields and in similarly dangerous spots like your basic superpowered hero-vs.-villain slugfest.)
Loophole has designed and built a suit of 'Iron Man' style power armor with flight, weaponry, and spacesuit capabilities. She's about fifteen. Dynamaxx has a similar power armor suit, but he may have bought some of the components.
In "Ayla and the Birthday Brawl" a squadron of mercenary killers, half of them in power armor, attack Ayla's friends. Since these are friends from Whateley Academy, this turns out to be a serious mistake.
Nick Klein inherited his grandfather's Powered Armor and his superhero identity, The Rocket, in Jim Zoetewey's Legion of Nothing.
Lampshaded in the blog-novel Flyover City! – crime fighting archer Sureshot is something of a joke until he dons his 90s-style cyber armor… transforming him into an even bigger joke.
"Or the Cyberarmor so after one of our troops is shot his body will keep firing guns while rock music plays".
Powered armor does appear in Darwin's Soldiers but they are intended mostly for carrying heavy cargo.
Any Machinima filmed using Halo will naturally require the presence of this trope. How much it's emphasized or played with as a part of the plot may vary.
Red vs. Blue adds specialization modules that give individual Freelancers different abilities. These can range from invisibility, to super healing, to creating a Stable Time Loop.
Soldiers in the Registry of Time universe wear suits of armor that increase strength, stamina, speed, and have built-in targeting systems.
Iron Man, War Machine, Iron Clad, Iron Cross, Captain Marvel and many others use these in Marvels RPG.
Dragon from Worm is famous for arriving at every battle in a brand-new powered-armor.
Defiant, as Dragon's partner, gets to wear some of her creations too.
One of the most persistent complaints about the short-lived The Avengers: United They Stand TV series was the decision to give most of the Avengers garish suits of battle armor that they wore over their existing costumes. Given the emphasis on the show's toyline, this was almost certainly an attempt at making the heroes more "toyetic".
As in the comic book continuity, Lex Luthor occasionally donned a Kryptonite-powered battlesuit in the Justice League franchise. Possibly as a friendly Shout-Out to Iron Man, it was originally intended to slow the effects of a terminal heart condition (ironically the result of constantly carrying around a piece of Kryptonite).
Also ironically, it packed Kryptonite rays up the wazoo, making it quite appropriate for battling Superman.
Granny May from WordGirl has one. In addition, one episode involved the Evil Genius Dr. Two-Brains building one.
The Earth Corps scientists from Inhumanoids wore Powered Armor designed for subterranean exploration.
Xanatos had several versions: His standard suit which resembled a crimson gargoyle, the bulky iron gargoyle suit that he used to fight Oberon, and a sort of skeletized armor that basically consisted only of a chestplate, powered gauntlets, and a rocket pack.
Dingo from The Pack in the same series opted for Powered Armor rather than cybernetic upgrades or genetic manipulation like his fellow Pack members.
The three modern Hunters are also briefly seen using their own variety of Powered Armour.
Demona had powered armor in the first act of "The Reckoning".
Subverted in "Leader of the Pack": Coyote appears to be Xanatos in yet another suit of powered armor, but it turned out to be a robot.
Transformers has a few varieties. The simplest are the exo-suits worn by Spike and Daniel in Generation 1—these are modified space suits that confer protection and limited transformation ability. Headmasters and Targetmasters in the American continuity are more advanced forms, which grant improved protection and firepower as well as full transformation abilities, effectively making them one with their partners. In addition, the Autobot Pretenders in Masterforce can summon powered armour as an intermediate form between their Human and Transformers forms.
The Apex Armor from Transformers Prime functions as this for Cybertronians granting invulnerability and enhanced strength. Miko later discovers that the armor works for humans as well.
The suit from Batman Beyond originally served as an aid to keep the older Bruce Wayne in decent fighting condition, before his heart gave out. The suit was certainly sleeker then most Powered Armors, protective yet still retained a certain fabric-like dexterity. Bruce later showed a more "Iron Man"-like suit he had designed years earlier, which was more powerful and had heavier armor, but also put a lot of strain on the wearer. Of course Bruce later got to wear the suit to help Terry in a jam.
In The Batman, everyone's favorite vigilante dons a power suit similar to the larger one from Batman Beyond in order to tangle with Bane. It allows him to survive, but that's about it. He later dons a different suit to battle a Mind Controlled Superman, although it doesn't help much aside from providing a distraction.
One of the episodes of the first season had Kim Possible obtaining a power armor that got powered up by the user's stress level. Ironically, despite all the good things that came with the armor, Kim defeated Shego much easier without the armor...
She later gets a battle suit. Among its features are: defensive shields, self-repair, the ability to capture and redirect energy beams and a physical boost sufficient to let her clumsy boyfriend become a star quarterback.
Exo Squad has the "Exo Frames", usually called "E-Frames", which are somewhere straddling the line between Powered Armor and Mini-Mecha, in addition to the occasional Giant Mecha (one of the Terran examples even has a hangar bay for launching E-Frames) and the lighter Powered Armor worn by the Jump Troopers.
The Monarch and his Deaths-Head Panoply from The Venture Bros.. Subverted in that it isn't actually powered. Its just a solid, unmoving suit that fires missiles and rockets about. He can't even move his arms. However this is due to design flaws that haven't been worked out yet.
In season five, Hank appropriates the "strength suit" of the former Countess of SPHINX, and it really does live up to the awesome potential of this trope. It's also pure fanservice in the "improbably molded metal" tradition, but it looks like Hank is hanging on to it regardless.
In "Gangland", an episode of The Spectacular Spider-Man, Silvermane shows off his powered armor, which inexplicably doesn't cover his face. It's the kind of powered armor that hums and whirs with every movement, and the noise tips Spidey off about how to defeat him.
Teenage Mutant Ninja Turtles (2003) villains Baxter Stockman and Darius Dun use these when they want to get offensive. The Shredder also takes to these when he wants a power boost, although, given his Utrom-y nature, those may actually count as Humongous Mecha.
Buzz Lightyear of Star Command established that Star Command spacesuits were power armor. Would've justified the toy's clunky appearance... except the animation style made the suit sleeker.
The CGI spin-off series of the Starship Troopers film series, Roughnecks: Starship Troopers Chronicles does feature powered armour, unlike the first two films. The troopers' standard suits are powered and provide some degree of strength enhancement, and they also use larger, more mecha-like suits called Marauders, typically 1-2 per squad of troopers. The Marauders are highly impressive until their limited battery life expires, at which point the occupant becomes "canned lunchmeat".
Sym-Bionic Titan: Although they resemble mechs, the armor Lance and Ilana use (Manus and Corus, respectively) fit this more. There are/were many more Manus armor back on Galaluna.
Believe it or not, it's coming, and getting increasingly advanced. Utah-based company Sarcos has already developed a functional powered exoskeleton called "XOS" that increases the strength of the wearer significantly. As one person put it, "From enough grace to gently play ball, to enough super-power to load a missile on an aircraft". And indeed, from the footage, it seems surprisingly mobile. The main problems being that A) Currently, it doesn't have the covering to act as armor, but they fully intend to add an outer shell when the kinks are worked out. And B) they're still working out how to power it as a self-contained unit. The scary part? Sarcos has been bought up by a defense contractor called Raytheon, meaning we may be seeing elite soldiers in these things by the 2020s. Indeed, the US Army already field tested it in 2009, and by 2010 Raytheon had developed an improved version named XOS 2, which can be seen in action here.
According to Scientific American, Raytheon plans to introduce a tethered version of their suit for operational logistics and loading/unloading in 2015, and an untethered version 3-5 years after that. The logistical problem with the untethered suit is building in a power supply that won't run out in less than an hour. But with recent advances in battery technology, that shouldn't be an issue for much longer.
Similarly to the above example, spacesuits used for EVA (extravehicular activity) are basically tiny spacecraft in the shape of a flexible suit, used for manual work outside in the vacuum of space. While the current US spacesuit, the Extravehicular Mobility Unit (EMU), remains more similar to clothing (in that you have to gradually put it on and off piece by piece), its Russian counterpart, the Orlan, is entered simply via opening a door in its back◊, entering and having someone close the door behind you. This technically makes the Orlan slightly closer in feel and design to a stereotypical Science Fiction suit of Powered Armor.