[[quoteright:350:[[Anime/MobileSuitGundam http://static.tvtropes.org/pmwiki/pub/images/ace_custom_660.jpg]]]]
[[caption-width-right:350:[[RedOnesGoFaster The red one goes three times faster.]]]]

An ace custom is a piece of technology -- a HumongousMecha, SpaceFighter, a [[WeaponOfChoice particular weapon]], or something similar -- that differs from the normal model due to being tweaked in order to better fit its user. Said users are typically {{Ace Pilot}}s, and their equipment is customized to their specifications -- thus, ace custom. The extensiveness of this customization varies widely, from simply giving it a [[DistinctiveAppearances new paint job]] to actually having a completely unique machine built from scratch. Closely related to the SuperPrototype, an ace custom will usually be significantly more powerful than a standard model.

Normally, ace customs reflect their user's combat style -- a pilot preferring [[FragileSpeedster high-speed combat]] will boost their engine output or add additional thrusters, a [[TheGunslinger gunslinger]] with ImprobableAimingSkills will add a [[{{BFG}} big gun]] with [[GunAccessories scopes and bipods]] for increased accuracy, etc. This may allow them to be WeakButSkilled, if their equipment doesn't have as much raw power as their opponent's, but it's so tuned to their strengths that they can compete anyway. It may become so much so that it becomes a case of OnlyICanMakeItGo. It can also be a case of being a FullPotentialUpgrade, if the customizing is required to make the user more effective.

Usually mentions the simple sense that such modifications, while ostensibly improvements, would add too much cost and complication to mass produce while the Ace is much less inclined to care about such things. May still be shown to have suffered on reliability or simply be considered unsafe if they're regularly pushing design limits.

Everyone else just has to settle for the MookMobile.



[[folder:Anime and Manga]]
* Used frequently in the ''Franchise/{{Gundam}}'' metaseries, from [[CharClone Char's]] iconic [[RedOnesGoFaster red]] Zaku II in ''Anime/MobileSuitGundam'' to Amuro's custom-build-from-scratch Nu Gundam in ''[[Anime/MobileSuitGundamCharsCounterattack Char's Counterattack]]''.
** ''Anime/TurnAGundam'' has an ironic twist, with Gavan Gooney choosing the most distinctive of the Borjarnon units unearthed. Fans would recognize the Borjarnon as the Zaku '''II''' from ''Anime/MobileSuitGundam'', while Gavan's is a Zaku '''I'''.
** Oddly, the Astray units from ''Anime/MobileSuitGundamSEED'' only had one unit that could be classified as an AceCustom and it wasn't even part of the actual series, but a case of AllThereInTheManual.
*** The Astray ''prototypes'' from ''Manga/MobileSuitGundamSeedAstray'' on the other hand... Red Frame, Blue Frame, and Gold Frame have been so heavily customized by their respective pilots that they barely resemble the original model anymore (especially the Gold Frame, which, among other things, actually has the Blitz Gundam's right arm that Kira chopped off!)
** [[Anime/MobileSuitZetaGundam Kamille Bidan's Zeta Gundam]] is a special case, where Kamille essentially designed his own personal mobile suit from the parts up (essentially combining [[TransformingMecha movable frame technology]] with the Gundam Mk. II) and then began obsessively tuning it to his capabilities. [[OnlyICanMakeItGo The personal performance tuning becomes a problem when he's out of commission.]]
** Graham Aker from ''Anime/MobileSuitGundam00'' is the king of Ace Customs in that universe, earning him the FanNickname "[[CargoShip Flagfucker]]". After his first clashes with the Exia, he has his [[FragileSpeedster Flag]] upgraded with better equipment and when even that isn't enough, he ''rams a [[AppliedPhlebotinum GN Tau drive]] into his Flag''. In the second season, he initially uses a customized [[EliteMook Ahead]] with [[KatanasAreJustBetter katana-shaped]] beam sabers but his next two machines are both one-of-a-kind units visually based on the Flag. In the movie, he uses yet another Flag-based Ace Custom, the Brave Commander Type, with two drive exhaust units instead of the [[EliteMook base model Brave]]'s single unit; this caused some fans to mistakenly assume that the Brave Commander Type has a [[BiggerStick Twin Drive System]] when in truth, [[BadassNormal simply has two GN Drives]].
*** Soma also uses two Ace Customs [[spoiler:before her HeelFaceTurn]]: a pink Tieren designed specifically for her and another modified Ahead which becomes a hand-me-down for [[spoiler:Louise Halevy]].
** Taken to the logical extreme in ''Anime/GundamBuildFighters'', as to win, one must have a custom model of a suit that likely was already an AceCustom or SuperPrototype in the above series' to even have a chance of winning for the most part. Just piloting a repainted Ace Custom will result in a broken model - just ask that one Legend Gundam that got turned into mincemeat by the Kampfer Amazing.
*** Or the Turn X which got curbstomped by Sazaki's [[LuckilyMyShieldWillProtectMe Gyan]] [[MoreDakka Vulcan]].
*** ''Gundam Build Fighters'' is chock-full of Ace Customs, ranging from Gundams (Strike, X, Exia, Master, MK-II, Wing, F91), non-Gundam aces (Sazabi, Zaku II Char Custom, Astray, Qubeley, Turn X) and even mooks (Kampfer, Acguy, Gouf, ZAKU Warrior, GM Sniper, Gyan).
** The ''Build Fighters'' example above was exemplified earlier in ''Anime/ModelSuitGunplaBuildersBeginningG'' as it was shown that throwing together a suit all willy-nilly will only lead to a suit that'll barely stand up against more experienced fighters.
* ''Anime/PanzerWorldGalient'': [[TheDragon Hy Shaltat's]] [[HumongousMecha Wingal Zee]], which has a silver coat of paint and [[DualWielding wields two tomahawks]] (instead of one, unlike the others [[AMechByAnyOtherName panzers]]).
* In ''Manga/KnightsOfSidonia'', Nagate Tanikaze makes consistent use of these, starting with the Tsugumori that is technically an obsolete type 17 but puts greater emphasis on pilot skill than auto pilot, allowing outstanding performance from the ace himself. He later uses [[spoiler:the advanced combat prototype and the Tsugumori ll]].
* ''Anime/SuperDimensionFortressMacross'' has Maximilian Jenius and his wife, Zentradi defector, Milia Fallyna, being granted the privilege to give their mechas distinctive paint jobs for being the top pilots of the force.
** There are two ace custom Valkyries, Hikaru's that has a triangular visor, two guns and a "chin" (VF-1J), and the Skull-1, with FOUR guns on the head (VF-1S). Both have custom paint jobs as well - Hikaru's is painted in red stripes, the Skull-1 is painted with black and yellow ones, with prominent skull-and-crossbones.
** Based off of [[AllThereInTheManual side info like model kit manuals]], Brera's VF-27β is indeed an Ace Custom, while the VF-27γ [[spoiler:piloted by Grace]] is the "common soldier" version.
* ''TengenToppaGurrenLagann'' has a number of unique mecha, but of particular note are [[TheFourGods the Four Generals]], each of which has a custom mech despite their minions using basic {{Mook Mobile}}s.
* ''Anime/CodeGeass'' features several ace customs. The Knights of the Round are an elite, 12-person ace custom squad piloting highly personal, one-of-a-kind mechs, including the TransformingMecha Tristan. The Japanese side has the Guren, the [[http://www.youtube.com/watch?v=G2s_EeYBqJI Shinkiro]] and the Zangetsu as their ace customs.
** The Shinkirou is an interesting case; it's the Ace Custom of Lelouch, who's actually pretty bad at straight combat. However, it's tailored specifically to his strengths, wielding a scattering laser cannon and a BeehiveBarrier that require a mind as quick as his to coordinate properly; in his hands it can single-handedly clear an entire battlefield in moments.
* Admirals on both sides in ''LegendOfTheGalacticHeroes'' get ace custom flagships, which tend to be slightly more powerful than their factions' regular fleet ships and serve as Ships of the Line in their {{Standard Sci Fi Fleet}}s.
* In ''MagicalGirlLyricalNanoha'', the TSAB's mooks use relatively standardized Storage Devices (spear-like ones for the melee-oriented Belkan style and staves for the range-oriented Mid-Childian style), but their elites are granted much rarer [[EmpathicWeapon Intelligent Devices]] with more sophisticated AIs and forms tailored to their areas of specialization.
** Notably, Chrono Harlaown's Durandal is a mere Storage Device, which he prefers because it processes magic more quickly than an Intelligent Device, and he is not tempted to grow dependent on its AI.
** Teana and Subaru from {{Anime/StrikerS}} each use a Storage Device rather than an Intelligent Device, but their Devices are both scratch-built and therefore still count as Ace Customs.
* ''Manga/BlackLagoon'': Revy's WeaponOfChoice is a [[GunsAkimbo pair]] of customized Beretta 92 series pistols with, among other things, extended barrels. She calls them the 9mm Sword Cutlass.
* In ''Anime/MartianSuccessorNadesico'', Akatsuki Nagare has his own Aestivalis when he joins the crew, outfitted with a better engine and armor material than the normal Aestis. When you're the CEO of Nergal, you can do these things.
* The main girls of ''InfiniteStratos'' have their [[PoweredArmor IS Suits]] customized to their fighting style. For example, Houki's IS takes advantage of her life-long kendo training, being a high-speed melee-focused suit wielding a katana. Charlotte's IS Suit is technically obsolete, due to being 2nd-generation (everyone else's Suits are 3rd-generation), but she's added several modifications (such as being able to dual-wield guns and being able to store and summon more weapons), which comes as a great surprise to her opponents (much like her true gender initially being a secret).
* Technically, the Black Getter Robo of ''Anime/GetterRobo Armageddon'' is this, being a heavily modified Getter Robo.
* In ''LightNovel/FullMetalPanic'', Sosuke has the customized "Crossbow" in the novel "Burning One-Man Force". While it's actually an obsolete machine (a first-generation Rk-91 "Savage"), it still fits the spirit of the trope due to being tuned for his abilities and painted white and navy just like his Arbalest [[spoiler:which was destroyed in the previous novel]].
* The Club Presidents and the Elite Four in ''Anime/KillLaKill'' have their Goku Uniforms (superpowered outfits) tailored to their specific clubs or fighting styles. For example, Tennis Club President Omiko Hakodate allows her to fire tennis balls at a literally machine-gun pace. Disciplinary Committee Chair Ira Gamagoori "disciplines" rule-breaking students with the ''many'' whips that sprout from his uniform, and has excellent discipline himself, as pain only makes him grow stronger.

* The Millennium Falcon from ''Franchise/StarWars'' doesn't look like a whole lot, but due to both Han's piloting skills and special modifications he built into it himself it is considered the fastest ship in the galaxy. In addition it is a bit more heavily armed than average. That doesn't stop it from occasionally acting up as TheAllegedCar would. Also, Slave I and Vader's TIE Advanced fighter.
* Porco Rosso's plane from "Anime/PorcoRosso" is the only one of its kind, as it was considered too dangerous to fly. Porco says (paraphrased) that while it's a nightmare to get in the air he thinks there's no better plane once it's flying.

* Mack Maloney's ''Wingman'' series features numerous ace customs -- the series is set in a post-WW3 DividedStatesOfAmerica, so the combat aircraft flown by many of the protagonists (including the main character, Hawk Hunter) are practically their personal property. The most prominent is Hawk's F-16 (possibly the last one in the world), which gets upgraded midway through to the F-16XL variant.
* Goes unmentioned in the films, but the Franchise/StarWarsExpandedUniverse reveals that [[Franchise/StarWars Anakin Skywalker]] had a penchant for this.
* Paul Naughton's ''LightNovel/ValkyrieIntoTheHeavens'' series features a number of different ace customs. Set in the future, the starships that the protagonists use are cutting edge prototypes and the only ones in existence until the designers standardize the designs.
* ''Literature/BrownsPineRidgeStories'': The Custom 1957 Chevrolet owned by the Raiden Brothers in Chapter nineteen ("The Race") is described this way by Elroy. This is [[JustifiedTrope Justified]] as they owned and operated an auto parts store and thus and the knowledge and best parts ("Every available Hot-Rod (sic) part from here to California had been acquired to make this the fastest Hot Rod on the east coast".) available to make their custom hot rod. [[spoiler: However, they still lose the race as [[ArrogantKungFuGuy they aren't the expert race car drivers they believe themselves to be]].]]

[[folder:Live-Action TV]]
* A two-episode story on ''Series/SpaceAboveAndBeyond'' featured "[[RedBaron Chiggy Von Richthofen]]", a enemy [[TheAce Ace]] capable of wiping entire squadrons of Earth fighters by itself. "Chiggy" flew a special version of the standard Chig fighter that had some kind of stealth technology making it invisible to Earth detection and targeting systems, was invulnerable to cannon fire, and in general displayed greater speed and maneuverability than any other fighter in the show. Also, its nose was painted with a human skull and the phrase [[TakeThat "Abandon All Hope"]] (in English, so his opponents could read it).
** In the end, [[spoiler:Chiggy gets taken out by a [[DesignerBabies Designer Baby]] human ace flying a ''standard-issue'' Hammerhead fighter with a single missile]].
* ''Series/DoctorWho'': Inverted (sort of) with the TARDIS, which was specifically selected by the Doctor out of a number of [=TARDISes=] because this particular one had a broken navigation system to begin with, and which has developed many more faults since. But these idiosyncracies fit the Doctor's style perfectly, and so he manages to take what should be TheAllegedCar and use it as a genuine ace vehicle.
** One episode in the revived series gives the TARDIS herself a chance to explain that from her perspective the relationship is kind of reversed. The Doctor is ''her'' AceCustom Time Lord, the mad one she chose to kidnap because ''his'' eccentricities and wanderlust suited her and her desire to go out and see the universe.

[[folder:Tabletop Games]]
* Done in the ''TabletopGame/BattleTech'' animated series, and in the world setting for the original game as well. Many "ace" Mechwarriors have unique mech variants, such as Justin Allard/Kai Allard-Liao's Yen-Lo-Wang ''Centurion'', or Natasha Kerensky's "Widowmaker" ''Daishi''.
** [=OmniMechs=], with swappable hardpoints, were pretty much specifically invented to allow players to build their own ace customs. In fact, there's nothing stopping any player or character with a Daishi to field the Victor, Hohiro, and Widowmaker configurations themselves.
** Subverted and then reinforced by the case of Yen Lo Wang. After nailing an astonishing five kills in his Trial of Position with Wolf's Dragoons, Ace pilot Kai Allard-Liao is offered a Dire Wolf (Daishi) OmniMech by the Dragoons. It's an unquestionably superior off-the-shelf machine. He refuses it because he feels he owes it to his father to pilot their family mech, Yen Lo Wang. No one believes for an instant that the upgraded but antiquated holds a candle to the clantech behemoth they've offered him, so it's subverted. The trope is then reinforced because the Dragoon instead completely overhaul Yen Lo Wang with clan technology, making it infinitely superior to all others of its type and most mechs in the Inner Sphere.
** Because many 'mechs are very, very old, many warriors with older machines have had to replace too-expensive or outright lost-and-forgotten older systems and weapons with substitutes, which end up creating a sort of ad-hoc AceCustom out of necessity. The quality of these machines varies quite a bit depending on what components were being replaced by what. This can lead to very scary Battlemechs being paper tigers because their powerful systems and weapons have been replaced or stripped, or it can lead to an awful surprise when a disreputable "white elephant" or otherwise unassuming design suddenly whips out a BFG.
** The Strategic Operations supplement offers players the ability to do aftermarket refits, and can significantly revamp a mech in so doing. There's also a quirks system which can represent both common features of a design or specialty add-ons to a particular mech.
* TabletopGame/{{Warhammer 40000}}'s own Maximillion Weissman had his own custom version of a Baneblade built. Functionally however it was near-identical to a normal baneblade, except for Weissman's superior crew which gave it slightly superior stats. Commissar Yarrick also has his own version of the Baneblade, the Fortress of Arrogance, which does have more [[BlingOfWar noticeable modification]]. It was presented to him as a gift from the Adeptus Mechanicus.
** Tau Commander Farsight has his own Battlesuit customized with the unique Dawnblade he found, subsequently making him the only tau unit dangerously competent in close combat, which suited his bloodthirsty tendencies.
** Asdrubael Vect can get a custom ravager/raider called the Dais of Destruction that packs 3 dark lances, armor 13 all sides, and a transport capacity of 10, meaning it will ruin someone's day quite nicely (if a more than a little expensive at 240 points for Vect and another 200 for the Dais).
** Literature/CiaphasCain ('''HERO OF THE IMPERIUM!''') gave a sniper his own weapon back on a TradingBarsForStripes mission, noting that the adjustments they make to their weapons makes them a lot more effective in combat.
** Every ork mekboy's creation, be it gun, vehicle, or HumongousMecha is by definition an AceCustom: sure, the general chassis is the same, but each and every shoota, trukk and stompa is unique due to the parts used to make it (whatever was lying around) and whatever inspiration (or heavy metal object) hit the mek that day.
* The ''[=CAMELOT Trigger=]'' setting for the ''TabletopGame/FateCoreSystem'' provides a bit of a twist: not only can knights have their own [[HumongousMecha armour]] customized as in many other mecha-based games, the rules also distinguish between equipment that endows the armour with skills of its own and equipment that instead gives it special "tricks" and situational boosts. A suit of armour with good relevant skills will perform well in the hands of even a less gifted user because it can substitute its own skills for theirs if need be (at least until the relevant system goes offline), but an actual "ace" is probably better off with more dedicated special purpose gear and less redundant automatic assistance...which then of course means that if a novice ever ends up having to pilot the same suit, they're that much more likely to be hopelessly lost.

[[folder:Video Games]]
* The OriginalGeneration mecha of ''VideoGame/SuperRobotWars'' is ''overloaded'' with Super Prototypes and Ace Customs, there's far too many to mention.
* ''VideoGame/AceCombat'' occasionally has custom paint jobs used by enemy {{Ace Pilot}}s. Frequently, you can use their paint job if you [[YouKillItYouBoughtIt defeat them]].
** Captain Bartlett of ''[[VideoGame/AceCombat5TheUnsungWar The Unsung War]]'' and Viper of ''[[VideoGame/AceCombatInfinity Infinity]]'' are both pilots who are known by their heavily customized (and old - Vietnam-era F-4G and [=MiG-21=], respectively) planes.
** In some of the games, particularly ''Infinity'', you can do this yourself with various parts you can customize your plane with, and occasional paint jobs from random drops.
* Throughout the ''VideoGame/ValkyriaChronicles'' trilogy, special Aces appear in many missions with custom weapons. Taking them down usually gave you that weapon or their blueprints in return, for you to use for yourself. Technically, this could also count for your own upgraded weapons, as you usually have the option to change weapons over to another spec type in its tree (such as a gun that lowers an enemy's defenses or one that performs better against armor).
* Getting technical, any of the titular mecha from ''VideoGame/ArmoredCore'' are ace customs. Each one is a specially built engine of destruction that accommodates the pilot's fighting style and can wield an astounding array of weaponry. Also, when Armored Core 4 appeared, mass production models of Cores appeared as {{mooks}}-- Normals. The newer NEXTS now being the weapon of choice for Ravens, err Lynx.
* The [=M1911A1=] Custom used by Big Boss in ''VideoGame/MetalGearSolid3SnakeEater''. When he receives it, he [[GunPorn goes into extensive detail]] about the number of modifications to it shortly before making his own: carving down the grip to make it easier to wield his knife at the same time in CQC. Old Snake in ''VideoGame/MetalGearSolid4GunsOfThePatriots'' gets his own in the M4 Custom, named so for the ludicrous number of extra parts he can attach to it, from sights and suppressors to underbarrel grenade launchers or shotguns.
* ''VideoGame/{{Xenogears}}'' uses this trope a lot, especially in the first disc. Named characters' Gears tend to be ''unique'' models custom-built for the pilot, while mass-produced Gears are used by {{Mooks}}. However, in the latter half of the game, many of the heroes [[MidSeasonUpgrade trade in]] their personally-customized Gears for [[LostTechnology Lost]] {{Magitek}} with superior capabilities.
* ''VideoGame/CustomRobo'' is, as the name suggests, all about ace customs.
* ''VideoGame/SwordOfTheStars'' features an ace custom flagship, a jacked-up [=CnC=] mission fused with a barrage mission. It costs a fortune, and you can only have one at a time. Oh, and losing one hits your morale harder than having something death star a major colony.
* The main characters of ''VideoGame/DanballSenki'' all use special LBX, either customized by themselves or done for them by prominent LBX producers (justified as good players are hired to test new products).
* Yasha from ''VideoGame/AsurasWrath'' has a jet bike called the [[AwesomeMcCoolName Lone Wolf: Corvette]], that has the power of the other deities Septentrion flagships, with speed similarly fitting for his fighting style.
* The ''Videogame/MechWarrior'' series has the [=MechLab=], allowing players to heavily customize their HumongousMecha to their liking. Some loadouts will simply adjust the [[SubsystemDamage armor distribution]] or how much ammo is carried for each weapon, while more extreme loadouts will share nothing in common with the original loadout; such as a player turning a long ranged missile support mech into a closed range brawler loaded with dumbfire rockets. In the singleplayer games, the bosses generally have AceCustom loadouts on their mechs, and sometimes the EliteMooks as well.
** ''Online'' also enforces this, as some updates introduce "Hero Mechs" and/or "Champion Mechs" that have different loadouts (and other bonuses in the case of Hero Mechs), along with a bonus towards earning XP and C-bills for using those Mechs. Hero Mechs often boast loadouts and hardpoint configurations unlike most canon variants seen in the tabletop game (though modified versions of unique canon units are present, such as the Yen-Lo-Wang and Aleksander Kerensky's Orion), while Champion Mechs use loadouts popular with the community/meta-game. Hero Mechs also come with unique paint colors and patterns.
* ''Videogame/AnarchyReigns'' have a pilotless example in Garuda, a TransformingMecha based on the [[MechaMook Gargoyle robot]]. However, while Gargoyles normally have plasma arms fit for ranged combat, Garuda possess a pair of drills instead for close-quarters combat to better fit his partner who prefer blasting enemies from afar with his [[LegCannon revolver cannon]].
* Several of the unique weapons in ''Videogame/FalloutNewVegas''. Some of the notable ones include ''Lucky'', a long-barreled .357 magnum revolver with gold etching and an ivory grip inlaid with a club symbol, ''Maria'', a customized 9mm pistol decorated with the image of Our Lady of Guadalupe, used by Benny, the ''Survivalist's Rifle'', an old Service Rifle chambered for 12.7mm ammo, ''A Light Shining In Darkness'', a compact .45 pistol with a custom hammer and sights, a snakeskin grip and an inscription of a passage from Literature/TheBible, used by [[BadassPreacher Joshua Graham]], and ''La Longue Carabine'', [[FriendlySniper Corporal Sterling's]] scoped cowboy repeater rifle.
** ''VideoGame/{{Fallout 3}}'' has a number, including the Reservist's Rifle, Dave's hunting rifle Ol' Painless, the Blackhawk revolver owned by Agatha's late husband, Sydney's 10mm Ultra SMG, Ronald Laren's Kneecapper sawed-off shotgun, and Smilin' Jack's Terrible Shotgun.
* ''Videogame/TheLastRemnant'' utilizes this method with both weapons and skills.
* ''VideoGame/SDGundamCapsuleFighter'' does this, allowing players to modify stats to make their units hit harder or move faster. A lot of times, though, it's just to make you die in one hit.
* ''VideoGame/StarTrekOnline'' does this with their starships. From the ship's outside look to the payload to the shields and engines, no two ships are actively alike.
** A villainous example of this is General Hakeev's ship, the ''Khnail'', a ''[[Series/StarTrekTheNextGeneration D'Deridex]]'' Romulan warbird. When you first see it, it's a normal ''D'Deridex''. The second time you run into it, it looks like your usual player Ace Custom with a few Borg gear. The third time, you find out that he's outfitted his entire ship, inside and out, with Borg technology that it no longer looks like a ''D'Deridex'', it looks like the ''[[Film/StarTrek Narada]]''. You scrap his ship during this third encounter and when you run into him again during a later mission, he's back to a normal ''D'Deridex''.
* By ''[[Videogame/{{X}} X3: Terran Conflict]]'' the [[SpacePirate Pirate Clans]] have put several custom-built ships into limited production for their {{Ace Pilot}}s, the most dangerous of which is the [[BossInMookClothing Blastclaw]] [[SpacePirate M3+ heavy fighter]] - a heavily shielded, extremely deadly ship carrying up to four [[FireBreathingWeapon fusion torches]] capable of [[SplashDamageAbuse roasting ships in seconds]]. There's even an extremely rare SuperPrototype version, which is [[LightningBruiser even faster and better shielded]]. Regular Pirates have to make do with salvaged ships, albeit customized with sweet NoseArt
* A rare non-weapon variant of this trope is present in the semi-realistic flight sim ''VideoGame/SkyOdyssey''. At the end of each mission players are given parts to customize their aircraft. How much you can buy depends on how well you scored in the previous mission. Players can also give their aircraft custom emblems, paint jobs, and names as well.
* The admirals of [[TheEmpire the Valuan Empire]] in ''VideoGame/SkiesOfArcadia'' all have AceCustom versions of the Valuan airships, designed to accommodate their favoured battle tactics. In addition there's the Delphinus, intended to be the royal flagship of the Valuan armada and both an AceCustom and SuperPrototype for the smaller 'Spectre'-class battleships. [[spoiler:Naturally, the heroes nick it, ensuring they have the fanciest ride in the game. Or rather, are handed it on a silver plater by the prince who would rather it be used to fight his mother.]]
* ''Videogame/{{Warframe}}'' [[RuleOfThree has three kinds]] of this, depending on the faction that built it; Grineer Wraiths, Corpus Vandals, and Tenno Primes. Grineer and Vandal customs are limited to gifts for reaching certain point levels during events, making them LostForever if you fail to get them before the event ended, while Tenno customs require ItemCrafting.
* In ''VideoGame/{{Shadowrun| Returns}}: Hong Kong'', Racter is a unique take on the [[DroneDeployer Rigger]] in that instead of being able to switch between various off-the-shelf drone models, he instead has a custom drone called Koschei that can be modified in capability as the game goes on.

[[folder:Western Animation]]
* The police cruiser that Stich stole when escaping the prison ship.
--> Yeah, he took the red one...
* The e-frames given to Able Squad in ''WesternAnimation/ExoSquad'' were all modified versions of the usual models, testing new features which inevitably turn the tide in the first battle they are used in.
** Phaeton's personal Command E-Frame is capable of shrugging off direct hits that would destroy a normal E-Frame. He later has it further customized with medical equipment to help treat his automutation syndrome.
* This was the ultimate fate of the WesternAnimation/MegasXLR unit: though it started as a stolen Glorft SuperPrototype, it was SO heavily modified by Coop that he was the only pilot familiar enough with the controls to actually use the thing, as opposed to its intended pilot, Kiva.
* ''WesternAnimation/SymBionicTitan'': Ilana's mech, Corus, is implied to be this since no others like it were ever shown. Lance uses a standard issue Manus armor with a slightly different color scheme; the CombiningMecha aspect probably isn't standard, though, since the King passed him a new model (his old one had been confiscated) before sending him off.

[[folder:Real Life]]
* Computer geeks with their computers, going from customizing the desktop to building the machine from scratch.
** [[http://www.gentoo.org Gentoo Linux]] is aimed at people who want to do this to their whole operating system.
* Some [[KatanasOfTheRisingSun Imperial Japanese Navy]] pilots flying Zeros out of Rabaul during UsefulNotes/WW2 ordered simple armor plate welded in around the interior of the cockpit. They were a minority but towards the end, the only ones left. Perhaps uniquely for the concept of AceCustom, they performed worse than the basic model... but were more likely to bring their pilots back to base.
** They just sacrificed speed and maneuverability for better armor. The stock Zero was very much a FragileSpeedster.
** This is a common habit among soldiers of all kinds. The end result often is that a weapon turns out to be better for a purpose other then that for which it was originally designed.
* B-17E 41-2666 "Old 666" Was an Ace Custom ''Bomber''. Namely, the crew took the already [[MoreDakka Dakka-filled]] B-17, and up-gunned it, with a fixed machine gun in front for the pilot, 2 for the waist-gunner instead of one, and upping all the .30 caliber ones to the larger .50 cal. All this came into play when Old 666 was on a mapping mission, alone, and was attacked by 15 Zeroes and 2 other planes. With 20 more minutes left in their mapping mission, the crew choose to simply [[OneManArmy dogfight the entire swarm of zeroes while still mapping]]. It worked.
* Carlos Hathcock, a US Marine Corps sniper during Vietnam (who wore a giant white feather in his bush hat), built a custom bracket to mount a 10X Unertl scope onto an M2 Browning machine gun which he used for several confirmed kills (including one at 2500 yards).
* During World War I, the "Red Baron", Manfred von Richthofen, became one of the most famous users of an "ace custom" with his bright red Albatros D.III with a reinforced spar on the aircraft's lower wing.
** The German ''Luftstreitkrafte'' offered [[AcePilot experienced pilots]] far more leeway in customizing the paint jobs of their planes than the Allied nations. While most French and British planes had plain green paint jobs with the appropriate national and squadron insignia, the Germans had all manner of weird and wonderful color schemes, with aces' and squadron leaders' planes often having a completely unique appearance.
* The ''Mallard'', the locomotive that broke the speed record for steam trains and has held it ever since, incorporated a number of tweaks to its design that made it an improvement over other engines of its class. Its designer, Nigel Gresley, always intended it as the record-breaker.
* Both studios owned by Music/YoshikiHayashi (the old One On One Studios he bought from Bob Rock of Music/{{Metallica}} fame before he sold it, and the new one built from scratch) are the musical version of this. While a variety of different artists have used him as a producer and recorded at both, both were constructed to be specifically useful to the needs of his own projects, including Music/XJapan and Music/VioletUK.