The Armored Titan from Attack on Titan is described as looking like a normal Titan, only with a heavily armored layer of skin. This allows it to withstand cannon fire and smash open the interior gate of Wall Maria. He's not just a mook though, as besides the power he also has human intelligence and military training.
Exalted: If you hate and/or hated by the Realm, you start by fighting non-Awakened-Essence Realm enforcers. Survive that, and you'll have to fight the Wyld Hunt (sic), elite Realm squads usually led by a Dragon-blooded and sometimes Sidereals too. Survive that, and you'll eventually fight Dragon-blooded riding Warstriders; though at this point you're usually a One-Man Army and don't have to worry about Realm incursion to your territory.
Extremely common in both versions of Warhammer. In Warhammer Fantasy, probably the most well known are the Warriors of Chaos, who are an army of evil warriors covered from head to toe cool evil armor, though the heavy cavalry for each faction, if they had any, could also be considered this. Even if a faction didn't have that, they would often have some heavily armored foot soldiers, such as the Black Orcs for the Orcs and Goblins. In Warhammer 40,000, all of the Space Marine armies fall under this trope.
Amusingly enough, in the Ork Codex entry describing "Meganobz", massively-armored Ork lieutenants, one of the main weaknesses they have is the fact that because they wear several tons of heavy armor, if they fall over it's nearly impossible for them to get up, and their underlings have to sweat and strain to get them upright again.
Alice: Madness Returns had the Armored Card Guards in the card level. These were much tougher than regular Zombie cards, though the main danger still came from the halberd they used.
The helmet wearing pigs in Angry Birds. The hits that would squash basic pigs would merely dent their helmet or at best make it come off. The trick was to have it come off and expose the pig to other blocks.
The Army Of Two games have "heavy" soldiers, typically enemy mooks who are wearing some variant of heavy EOD gear who only take damage from behind. In the sequel there are several variants of the heavies, including shotgun heavies (who can count as Lightning Bruiser) while later on there are minigun heavies, grenade launcher heavies, and flamethrower heavies. The shotgun heavies can be killed with concentrated, high-damage fire, especially against the head, while the latter three types can only be killed by shooting specific weakpoints on their backs (ammo canister, grenade boxes, or fuel tanks, respectively).
Assassin's Creed has guards wear more armour as they become more proficient, with the most-armoured ones being Elite Mooks effectively identical to full-powered Altaïr in abilities.
Assassin's Creed II has Brutes. All this does, in practice, is give them more health. They're also quite hard to hit with your weapons (as most guards are). Your best bet is disarming them (particularly satisfying in Brotherhood, where you can throw the axe/huge sword right into their torso) and using their weapon against them, or countering with your hidden blade. Which, yes, stabs right through their metal armour on a few particular finishers. Admittedly, some times, Ezio may just be stabbing them through the eyehole. And right into the brain.
The Dredge in The Banner Saga are always encased in dark black armour from foot to toe and are obviously much tougher than your human troops.
In Batman: Arkham City, there are mooks that wear armor that make them invincible against Batman's normal Freeflow attacks. To beat them, you must do a specialized Takedown that pummels them relentlessly before delivering the final blow. Normal attacks are the only thing they're immune to however, and anything that works on any other mook still works on them.
They prove more dangerous during predator combat as it's impossible to do a silent take-down on them. All of the ways to take them out produces some level of noise, like the same relentless pummeling as during normal combat which also leaves you exposed for a long time or ledge/inverted take-downs which causes them to scream.
Assault types in Battlestar Galactica Online. To illustrate, the weakest of the bog-standard mook Cylon Raiders has 250 hp. The equivalent Assault Strike, the Marauder? 515.
Weirdly inverted with turret-like Hosts. The regular version hides under impenetrable skull and is only vulnerable when it rises up to shoot. The rarer Red Host lacks said shell and can be shot at any time, but instead of a basic three-way Spread Shot it fires a five-way one that is ridiculously hard to dodge.
Bioshock Infinite had Beasts, who wore thick blast armour and wielded rocket launchers. They were often the most dangerous enemy after the Handymen and perhaps Motorised Patriots.
Borderlands has variants of some enemies, such as Hardened Skags, which have thick carapaces that reduce damage in certain areas. The Lance Troopers also have armour plating over most of their body; Badass Lance enemies are completely immune to attacks that don't hit their unarmoured points.
Borderlands 2 has Armored Psychos in the second playthrough and beyond. Also Juggernauts, even bigger versions of Goliaths with more armor and no weak points. Not to mention Alpha, Elder Alpha, and Fossil Skags, which have tougher and tougher hides; Fossil Skags are effectively bulletproof from the front!
In both games, armor also manifest in changing the damage modifiers to that enemy to be the same as if they were robots (shown with a yellow health bar), which means slightly less damage from regular attacks, considerably less from incendiary, and more from corrosive. The presence of Armored Psychos in True Vault Hunter Mode helps to make up for corrosive weapons doing less damage against shields and flesh enemies than it did in the first playthrough.
The Bureau: XCOM Declassified had all the alien enemies stronger than Sectoids fully encased in armour and thus have greater health than you and your squadmates. In the second half of the game, the Mutons begin to appear. Their armour is so heavy it has to be shot off, section by section, before you could finally begin to damage their health. Thankfully, it’s possible to just shoot the helmet off and quickly finish them with headshots.
Three Castlevania games feature Fleamen wearing chariot-like armor. Take the fleaman's speedy, erratic jumping and combine it with armor and a huge axe capable of doing high damage, and... yeah.
Condemned: Bloodshot had an abandoned museum level where the homeless people have divided up the pieces of medieval suits of armour between them, with some lucky bastards getting complete suits. They’re obviously harder to defeat than regular ones, especially since they wield proper swords or battleaxes instead of planks of wood or bits of rebar.
Jedi Outcast has heavily armoured Superpowered Mooks; the Shadow Troopers, who have been given artificially heightened Force powers, and lightsabers, and are protected by (literally speaking light) armour made with cortosis, a metal so tough it resists lightsabers. Good thing it isn't actually impervious to them in this version.
The following game, Jedi Academy, gives us hazard troopers. Their suits are more like Mini-Mecha, these ginormous death-suits that let them walk in lava like it's nothing. They're armed with concussion rifles, which will really ruin your day. It's basically the only kind of Imperial that still presents a threat when you've got your lightsaber.
Dead Space had some Slashers that still wore the same RIG suits you had, thus making it much tougher to dismember their legs.
Downplayed in Dishonored with Watch Officers and Overseers, who wore helmets and metal masks that provided partial protection from headshots (Watch Officers still had exposed face, while Overseers could be shot in the back of the head). Played straighter with music box Overseers, who only had their legs and back exposed and were a pain to kill because of that and their Anti-Magic abilities.
Dragon Age: Origins and Dragon Age II generally had the Lieutenant-rank humanoid warriors wearing firstly heavy chainmail, then full plate armour and elite enemies like Templars or Hurlock Alphas would always have plate armour. It would usually shave off 20+ points from the physical damage inflicted on them, unless they were previously weakened with Shattering Arrow or Sunder Armor skills.
Dragon Ball Z: Buu's Fury, in Babidi's Spacheship, there are Majin Warriors. By that point, you can kill them with a few hits, though some ahave breakable shields.
In some of the Dynasty Warriors games, the Nanman army wears bamboo armor, which is immune to arrows.
Einhänder has a Mook in stage 2 known as "Star" (German for "Starling"), which returns as a tougher armored version known as "Panzerstar" (Armoured Starling) in stage 5.
The Elder Scrolls has the near-equal distribution of humanoid enemies in heavy and light armour and neither is generally treated as being better than other. Played straighter in The Elder Scrolls IV: Oblivion in that tougher goblins and skeletons would always have a lot more armour than the basic varieties.
Fallout 3: as the PC progresses in levels, the Super Mutants begin to appear decked out in more and more armor. Throughout the series, human adversaries, such as the Enclave troops, tend to have better armor as the player progresses.
Fallout: New Vegas has the NCR Veteran Rangers and Legion Centurions, which frequently appear in the hit squads sent after you when you gain infamy with either faction, in which case they have higher Damage Threshold than their normal versions.
Far Cry 3 has Heavies and Flamers; the heavies wear high-grade bulletproof masks that take entire clips to shoot off, while the flamers have even more armor and are immune to fire. This makes them extremely hard to snipe, but the Heavies don't cover the backs of their heads, and both enemies can be susceptible to a simple Takedown if you select a specific Heavy Takedown skill.
F.E.A.R. games have the Heavy Armor Replicas who usually tot weapons that bring more hurt, typically those that are best used on them instead.
Knight-class enemies in Fire Emblem games generally require magic or a very strong axe-wielder to take down. Typically they have lower speed and movement than other classes which makes it easier to surround them and then double attack them.
Promoted units also seem to wear more armor than their first tier counterparts.
The Hardguys from Get Off My Lawn. They can temporarily turn themselves into solid steel, making them impervious to attacks.
God of War always replaces the normal undead soldiers with these after a certain point in the game. In Chains of Olympus the Cyclopsi also have armored version that you need to break the armour off of before they can be damaged.
How To Survive had military zombies wearing body armour and/or helmets, which meant they effectively required the use of leg shots or powerful melee attacks to kill.
Kane and Lynch 2: Dog Days had the Hong Kong riot police and military appear later in the game in full body armour. This gave them much greater health than the protagonists, and was combined with their above-average AI (i.e. the ability to perform headshots on you. )
Killer Is Dead had the gold-plated versions of regular Wires, which were much tougher, often requiring Adrenaline Rush to be finished off. Frequently, they also had better weapons and faster reaction time.
The Last of Us had the Fireflies in the final level of the game. Whereas the human enemies before were bandits with scavenged equipment, these had military-grade body armour and proper assault rifles. Thankfully, it was possible to sneak past them.
The Last Stand had many variations on the “armored zombie” theme, with protection ranging from a single helmet or bulletproof vest to complete set of body armour. Union City prequel also had
Some games in the The Legend of Zelda franchise feature Darknuts and Iron Knuckles, heavily armored enemies that can take a lot of abuse, and in the case of the former, frequently are only vulnerable to sword strikes from behind.
Lord Of The Rings The Two Towers and Lord Of The Rings: Return Of The King games had the advanced Uruk-hai clad in their iconic black armour. These were much tougher and often required finishing moves to defeat, though offence-wise they were no different from more common Uruks.
Majin And The Forsaken Kingdom had heavily armored varieties of basic and shielded Dark Warriors appear about halfway through the game and become more common from there. While they're much tougher than normal varieties, they remain equally vulnerable to the stealth kill.
Mercenary Kings had some armored enemies, which received 30% less damage from normal weapons, but were vulnerable to caustic damage. These include Armored Runner and Sniper, which are identical to normal ones but much tougher, as well as unique enemies like Grenade Gordon.
A few times in Max Payne 3, you encounter troops in effectively bulletproof heavy armour who also wield LMGs. Only headshots will take them down. There are two varieties: The first kind needs multiple headshots to gun down, but are thankfully rare, with a cutscene every time one appears. The second only needs one and can be knocked down with body shots to make the finishing shot easier, but are also more common.
Medal of Honor: Frontline had enemies in body armour that had around twice the health of regular enemies.
Medieval 2 Total War allowed you to do this with just about every troop in the game thanks to the armour upgrades from blacksmith building line. The regular archers and spearmen could go from no armour at all to heavy chainmail, while the Merchant Cavalry could gain heavy plate armour. You could only armor two-three units a turn, however, and this prevented you from building any more new units during it, so it was only worth it if you didn’t have the need or the budget for more troops of any kind.
Having blacksmith pre-built let all the troops recruited from that time forwards get the armor upgrade, which somewhat mitigated the problem.
Metroid Prime: The early stages have "Plated" versions of regular enemies who are harder to damage (most are resistant to the beam weapons you have, but not missiles).
Same goes for the Armoured Pirate Troopers in Corruption.
Modern Warfare 2 has the Juggernauts. They can take all kinds of damage without even flinching before they go down. Unfortunately under certain circumstances they prove to be fast-charging Lightning Bruisers...
Nintendo Land's Zelda-based attraction has enemies with varying levels of armor. Moblins with pot helmets and metal shields would probably be the best match for this trope.
Paper Mario: Koopatrols, which are similar to Koopa Troopas, but with armor plating and a spiked helmet that keeps them from being stomped on under normal circumstances. However, like all other Koopas, their defense drops to zero once they've been knocked down with a jump attack or a tremor.
Super Mario RPG: Most of the Mooks Mario Co. fight early on in the game make reappearances later in armor or armor-like features, with corresponding increases in health.
Mooks in Perfect Dark Zero frequently wear either armored vests, helmets, or both. The latter prevents One-Hit Kill headshots with most weapons, although armor-piercing weapons such as the DY-357 magnum can thwart it.
Red Faction had the Masako-led mercenaries take over from regular Ultor guards in the final act of the game. They wore full body armour and that was practically impervious to small arms, requiring heavy shotguns, advanced sniper rifles or the Rail Gun to take down.
Special mention goes to EliteEnforcers, whose armour is not only heavier but also electrified, so that each hit you land will damage Nilin back, and their health is obviously much greater. The only real way to take them down is to use the Regeneration combos, which in turn requires you to keep the Charge meter up with combos scored on weaker mooks.
Sonic Heroes has the Egg Hammers, which have a very high number of HP and can only be defeated by the power character. However, at least this robot is vulnerable all over—there is a Armored variant that wears a helmet and is only vulnerable on its rather small head underneath. When attacking, it is very easy to miss the robot's head completely, even with the Level 3 bomb shower attack, or accidentally run into the robot's hammer once it's knocked over.
Overlaps with Giant Mooks in Spec Ops: The Line. The 33rd Battalion had its Heavy Troopers wear bomb suits and aviation helmets, then have bits of bulletproof vests and other body armour duct-taped onto it. Unsurprisingly, they can barely walk in spite of being 2.1 meter tall, but they require an entire assault rifle magazine, three hand grenades or 2 grenades from underslung grenade launcher to take down. That, and they fight with either Light Machine Guns or the AA-12 automatic shotguns.
The commercial remake of Spelunky had the knight enemies, which had relatively high health. However, it was possible to shatter their armour with a single Goomba Stomp, turning them into simple Cavemen.
S.T.A.L.K.E.R.: Shadow of Chernobyl had the exosuit enemies, while Military Stalkers and Spetsnaz troops wore the highly advanced regular body armour. Headshots still work, although in the case of those wearing Exoskeletons, you'll need two shots to the head.
The Suffering had Festers, whose skin was metal and completely bulletproof – even machine gun turrets have no effect on them. As such, they either need to be brought down with dozen or so shiv strikes while avoiding their counterattacks burnt with a flamethrower or 4-5 Molotov cocktails or killed with explosives. Alternately, the Creature form would make short work of them while it lasted.
One level of Syphon Filter 2 has fully-armored mooks who can only be killed with explosives. At least four bosses in the series are also explosion-proof, and must be defeated by unconventional means.
The full-armored mooks return in Omega Strain's International University mission. This time, they can be killed by shooting their backpacks, similar to Girdeux in the first game.
In Iron Brigade, Breakers are slower than the standard cannon-fodder Resistors, but have a thick armored shell that can only be destroyed with explosives (such as an artillery cannon). Once this is destroyed, their mobility increases and they become vulnerable to most weapons.
Turok 2 has Juggernauts, Lords of the Flesh, Mantid Soldiers, and Troopers. The former two are also Lightning Bruisers.
Wolfenstein 2009 had the Nazi Heavy Troopers whose Powered Armour was so thick it was impervious to small arms. Killing them required shooting the two lamps on their shoulders from their lightning gun’s power pack. This would take them and any surrounding enemies out in a nice green explosion.
Medieval Knights and plate-armoured Men At Arms, compared to the regular conscripted footmen. The latter would thank their lucky stars if they even received chainmail and often didn’t even have leather armour.
There were experiments with issuing body armour to soldiers in World War I, but was considered too heavy and cumbersome to be worth it. Still, a few special units sometimes used it. For example, snipers and machine gun crews sometimes wore it to protect against enemy snipers (the bullets didn't have so much power at long range), tank crews wore it to protect against shrapnel, and German assault troopers occasionally wore it because it was quite useful against pistol bullets and melee weapons.