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1Despite the fact that the plots of the games usually appear barebone, ''VideoGame/MetalSlug'' has its fair share of characters, all of whom have a great deal of backstory to them. The backstory to each character is where the real plot points stand out.
2
3Characters who debuted in ''Metal Slug Defense'' and ''Metal Slug Attack'' can be seen [[Characters/MetalSlugDefense here]] and [[Characters/MetalSlugAttack here]].
4
5[[foldercontrol]]
6----
7!Protagonists (Broken down by game appearance)
8
9!!''Metal Slug''
10
11[[folder:Marco (Marchrius Dennis Rossi)]]
12[[quoteright:305:https://static.tvtropes.org/pmwiki/pub/images/msd___marco_rossi.png]]
13 [[caption-width-right:305:"Pull your finger out and get to the source code."]]
14
15The main protagonist of the series, Marchrius "Marco" Dennis Rossi joined the military's vocational school following technical high school, and after graduating, joined the Peregrine Falcons Squadron, soon becoming its leader. Though generally a good-natured guy, he tends to go mad whenever Morden is mentioned, given the fact that Morden was responsible for the deaths of many of his good friends.
16
17Off the battlefield, Marco is an expert computer technician, often creating computer viruses for fun, but one in particular that unintentionally made its way onto the net infected the military's mainframe, made it past all of the firewalls and almost caused the launch of several nuclear missiles. He intends to take that secret to his grave.
18
19From ''Metal Slug 6'' onward, Marco's unique ability is to deal double damage with his handgun. If playing on Easy, though, this ability transfers over to the automatic Heavy Machine Gun. In Metal Slug 7/XX, he can also use the Burst Shot, which allows for rapid fire, though he can't move.
20----
21* TheAce: Marco is competent at a lot of things. Being a playable character, he is one of the top fighters, the scenario of the very first story shows he is a very good leader who can reassemble losing forces and counterattack against Morden, he is shown to be a very good computer technician, as only he and Fio hijack the Martian computer with next to no struggle in the third game, and he can ride vehicles just like everyone else who is playable.
22* AllAmericanFace: More or less designed as the typical American war movie hero.
23* BadassesWearBandanas: He's been wearing that iconic white bandana of his into the battlefield ever since the first game.
24* BerserkButton: Anything involving General Morden, due to the latter killing many of his comrades during his attacks.
25* BigNo: He lets out one for his death cry.
26* BoringButPractical: His ability in the later games is dealing double damage with a handgun. While this is hardly flashy, it is invaluable whenever if one is without any upgrades. In ''Defense'', his special is to shoot his Heavy Machine Gun, which is hardly flashy but a good all-purpose skill.
27* {{Eagleland}}: He is a tanned, blonde-haired American who loves big guns and justice.
28* EmergencyWeapon: Starting in ''6'', he is focused on making the starting peashooter of a handgun not so pathetic. By dealing double damage, the standard fallback weapon of ''Metal Slug'' protagonists is actually pretty decent. Another weapon is still preferable, but not as much.
29* ExtendoBoxingGlove: An alternate melee attack for when he's crouching.
30* {{Handguns}}: His attack power is doubled while firing a handgun.
31* TheHero: The leader of the team and the poster boy of the series.
32* HeterosexualLifePartners: With Tarma, who has been with him since the very beginning.
33%%* NiceGuy
34* PlayfulHacker: During his spare time. He accidentally almost launched nuclear weapons at one point.
35* TheSmartGuy: Outside the battlefield he's an expert hacker.
36* TrulySingleParent: He is the "father" of [=MS-ALICE=], [=MS-HEART=] and [=MS-PHI=], AI he created; he's also the legal guardian of Midori Schumann.
37* VitriolicBestBuds: With Tarma. While they tease each other, they have been loyal to each other and kicking ass together since the very first game.
38[[/folder]]
39
40[[folder:Tarma (Tarmicle Roving III)]]
41[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/vtegbs4mhid3subweaeq_6.jpg]]
42 [[caption-width-right:300:"So what's your next move...?"]]
43
44Son of a military man, Tarmicle entered the Special Forces Training School after finishing junior high. At age 20, he joined the Peregrine Falcons on a mission to rescue the president, at which point he met Marco, the two becoming fast friends. When he found out Marco had been selected to take part in the counteroffensive against Morden, Tarma was quick to volunteer. Though he often pokes fun at Marco, he holds his friend in the highest regard.
45
46Whenever he is not engaged in battle, he builds custom motorcycles with such attention to detail that he puts most professionals to shame. If and when he can retire from active service, he intends to open his own motorbike shop.
47
48Tarma's engineering skill from ''Metal Slug 6'' onward allows him to make better use of the Slugs that he comes across. They can take twice as many hits, he can use the vulcan fix, the vulcan's damage is increased, and he obtains twice as many Slug Shells on pickup. In 7/XX, he can also kick Slugs, which can either recover or damage them. However, the double durability and recovery/damage kick only works on Vehicle Slugs.
49----
50* AcePilot: His specialty on the team starting in ''6''. He is the best at handling vehicles and it translates to gameplay as tougher vehicles, stronger weapons in them, and new abilities.
51* BadassBiker: Off-screen. The CoolShades and his backstory of expertly building bikes establish him as this.
52* CoolShades: Tarma is never seen without his shades. It also helps distinguish him from Marco at a glance.
53* DemotedToExtra: Becomes a supporting character in ''4'', but regains his playable status in ''5''.
54* GadgeteerGenius : He is the team's Slug expert, largely due to him tinkering with vehicles in his spare time.
55* GlassCannon: In ''Defense'', he has the lowest HP of the four main characters but his Shotgun does the most damage.
56* HeterosexualLifePartners: He is the only character who has been with Marco from the beginning.
57* TheLancer: Marco's best friend and foil, as well as the default player 2.
58* MeaningfulName: As the Metal Slug technician of the team, his name last name is ''Roving.''
59* ObligatorySwearing: F-Bombs upon a player's death. Some console releases alter the game so that he shares Marco's death cry. Averted in story-driven installments such as ''3D'' and ''Defense''. Tarma doesn't even cuss a single word in-story.
60* PercussiveMaintenance : His Slug Kick. Sometimes averted, causing damage to the Slug instead.
61* VitriolicBestBuds : With Marco.
62[[/folder]]
63
64!!''Metal Slug 2''
65
66[[folder:Eri Kasamoto]]
67[[quoteright:296:https://static.tvtropes.org/pmwiki/pub/images/msd___eri_kasamoto_0.png]]
68 [[caption-width-right:296:"You live then you die - all alone..."]]
69
70Eri was found abandoned on the steps of a church. When she became wise to the ways of the world, she eventually ran off and became the leader of a gang of street kids. The Intelligence Department of the Regular Army noticed her leadership skills, and thus recruited her. She went on to receive spy training, and took part in a number of missions requiring assassination. She found these types of missions distasteful, and requested a transfer to the SPARROWS division. Given her impressive track record, it was approved. Once transferred to the SPARROWS division, she was assigned the role of team demolitions expert.
71
72Given Eri's background of growing up among street children, her demeanor and attitude in life mostly boils down to "Rely on nobody but yourself."
73
74Eri's unique talent from ''Metal Slug 6'' onward is handling grenades. She starts each life with 20 instead of the normal amount, gains double grenades on pickup, deals more damage with them, and is the only one able to aim her throws, which includes straight upward.
75----
76* ActionGirl: Kicks as much ass as any of the men.
77* BadassesWearBandanas: She always wears one in nearly every appearance.
78* BrutalHonesty: In her first mission with Fio, Eri bluntly says that Fio's inexperience in combat is going to get them both killed, and that Fio was better hanging back so Eri could go on alone.
79* TheBigGirl: While the whole team packs plenty of power, she's the explosives specialist.
80* CompressedHair: Hidden in her bandana in her sprites. Some pieces of official art would have some of her hair spew out of the back of her head.
81* DarkAndTroubledPast: We need to reiterate that her old career as an espionage agency assassin was apparently somehow so "distasteful" that she compares it unfavorably to ''blowing people up with grenades and flamethrowers''.
82* DemotedToExtra: Becomes a supporting character in ''4'', but regains her playable status in ''5''.
83* HardDrinkingPartyGirl: She loves to drink spiritas (a 96-proof vodka).
84* HeterosexualLifePartners: With Fio.
85* InformedLoner: She's on a four person team by the time of her introduction and does little to show off her loner personality. Made more apparent in ''Attack'', where one of her strongest memories is abandoning Fio on her first few missions because she was too slow.
86* InSeriesNickname: "Memphis Bomb Princess".
87* JapaneseDelinquents: A variation. Eri was a former ''sukeban'' (female gang leader) and she still sports blond hair.
88* KickChick: She can sometimes use kicks as a melee attack animation.
89* {{Mukokuseki}}: While she does have (light) brown eyes, her hair's a shade of blond that is anything but Asian, let alone Japanese (she's from Hiroshima). It is unknown if her blond hair was a dyed leftover of her childhood as a ''sukeban''.
90* SdrawkcabName: Spelling her name backwards in Hiragana will get the name of a famous Japanese pop star Rie Tomosaka.
91* StuffBlowingUp: Starting in ''6'' her specialty is grenades.
92* TomboyAndGirlyGirl: Eri's the Tomboy. Her backstory, attitude, and appearance are much tougher than Fio's.
93* YoungerThanTheyLook: Eri's two years younger than Fio, considering Eri's tougher personality.
94[[/folder]]
95
96[[folder:Fiolina "Fio" Germi]]
97[[quoteright:259:https://static.tvtropes.org/pmwiki/pub/images/20190401113417820.jpg]]
98 [[caption-width-right:259:"Don't worry about me, I'm just fine."]]
99
100Daughter of the massively wealthy Germi Family, hailing from Italy. The Germi family has historically been a military family, sending their oldest into service, so naturally her father wished for a healthy son to carry on the name. However, following Fio's difficult childbirth, her mother was unable to bear anymore children, making it the first time the Germi heir was female.
101
102Eri's polar opposite, Fio was raised in a loving family, and has a cheerful and upbeat demeanor. Aside from her soldier training, she also studied chiropractics, acupuncture and moxibustion in university, and hopes to become a sports doctor in the future.
103
104Fio's special trait from the sixth game onward is carrying extra ammo for her weapons. She starts each life with a Heavy Machine Gun, and gains 50% more ammo on weapon pickup. If playing on Easy, though, she automatically gets the Big Heavy Machine Gun as her initial armament.
105----
106* ActionGirl: No less a capable fighter than any of the men.
107* BigEater: {{Downplayed}} compared to Nadia, but still present especially in the pachino slot machine spin-offs that Fio appears in which usually leads to her stuffing herself silly if players get a jackpot. Fio's actually been trying to avert this in recent entries due to it ruining her figure, as most of the extra weight goes to her already large bust size.
108* BadassAdorable: Best exemplified by her victory animation of her falling down coquettishly. Mind you, this is after wiping out hundreds of enemy troops. Fio's even this when she's sporting a big belly, which makes her more cuter compared to most examples.
109* BalloonBelly: Tends to get this treatment quite often in the spin-offs, especially the pachino slot-machines (Jackpot!). She's practically the poster-girl for this trope in the series. Though she has been trying to slow down on it in recent entries due to it ruining her figure since the extra weight causes her already large bust to get bigger.
110* BespectacledCutie: An archetypical example in video games. She's got the glasses, cute look, modest personality, and is overall moe because of it, her adorableness doesn't go away even when she's sporting a huge BalloonBelly, which actually makes her more cuter.
111* DareToBeBadass: Eri's cold abandonment on their first few missions together basically had this effect on Fio, as shown in ''Metal Slug Attack''. Eri's open willingness to call out Fio for being weak when she's spent her entire life being coddled is what pushed her into becoming as competent as she is now. That being said, she usually retains her meek demeanor off the battlefield.
112* DCupDistress: Her breasts are quite large, often to her distress, which is the reason she tries to slow down on her BigEater tendencies in recent entries as all of the extra weight she gains makes her already large breasts bigger.
113* FingerPokeOfDoom: Her melee attacks include swift tonfa strikes, hatchet slices, and [[WimpFight prissy slapping and shoving]]. Enemy soldiers die horribly all the same.
114* GirlyBruiser: A hardened killer whose hobbies include embroidery and ballroom dancing.
115* GuestFighter: She is playable in ''VideoGame/TheKingOfFighters: Maximum Impact 2''.
116* TheHeart: The medical expert of the team and also the most emotional.
117* HeterosexualLifePartners: With Eri.
118* HeroicSelfDeprecation: She usually thinks less of herself in comparison to her teammates.
119* LastOfHerKind: Fio's parents' greatest fear, as she is the current and only heir of the Germi family in a very dangerous line of work, and her mother can no longer give birth to another child. See StayInTheKitchen below.
120* MsFanservice: A lesser one compared to Sophia, but is far better known among fans due to appearing earlier and is part of the main game series where as Sophia only appears in the mobile versions. A cute girl wearing glasses with with a nice busty figure (which is obvious on any piece of official art, especially next to the modestly endowed Eri), of which Fio has the biggest bust of the playable female cast with only Nadia (and her replacement [[SuspiciouslySimilarSubstitute Tyra]]) coming the closest, she's even this when she's under the BalloonBelly effect as it actually increases her bust size (much to Fio's chagrin as the weight she gains goes directly to her breasts), which explains why Fio's bust is so big compared to the rest of the female cast.
121* MoreDakka: Her Specialty from Metal Slug 6 onwards. The Heavy Machine Gun is basically her ''default'' weapon.
122* OlderThanTheyLook: Despite her appearance and character, Fio is two years older than Eri.
123* RevolversAreJustBetter: Her basic handgun is actually a revolver, [[SubvertedTrope though it does the exact same amount of damage as the other protagonists' pistols]] and isn't limited to a certain amount of shots (so you can keep mashing like everyone else).
124* ShockAndAwe: A version of her in ‘’Attack’’ uses a Thundercloud and a ChainLightning gun. Thing is, Fio is afraid of lightning. An entire Ops storyline is dedicated to her overcoming her fear to use it. A new "Super Devil" form wields Lighting GunsAkimbo.
125* SmallGirlBigGun: The heavy weapons specialist is the smallest of the four main playable characters.
126* StayInTheKitchen: Fio's father would rather she not be in combat so damn much. Whether it's because she's a woman or because she's an only child (LastOfHerKind and thus putting the whole family line in danger since she has no children of her own) is up for debate (possibly both).
127* TookALevelInBadass: She's normally the meekest of the main cast, but at the end of ''Metal Slug 3'', she stands in a very proud manner atop of a floating Metal Slug. Eri, in comparison, has a hunched demeanor.
128* TomboyAndGirlyGirl: Fio's the Girly Girl compared to Eri's Tomboy. She's got a sheltered background, [[BespectacledCutie cuter looks]], and is much less hardened in general.
129* WeightWoe: Becomes more apparent in the recent games, as Fio's BigEater tendencies causes her large bust to get bigger, so she has been trying to slow down on eating.
130* WimpFight: Believe it or not, this is one of her melee attack animations, but it's subverted in that it can damage or ''even kill'' any human-sized enemy with her sissy flailing.
131[[/folder]]
132
133!!''Metal Slug 4''
134
135[[folder:Nadia Cassel]]
136[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/msd___nadia_cassel_0.png]]
137 [[caption-width-right:350:"This is suh-sweet, non?"]]
138
139Initially, Nadia wanted to go into the modeling business, but she couldn't stop eating, which meant she kept gaining weight, so she enlisted into the Regular Army for the exercise. She soon discovered her skills as a soldier, and was chosen to help in stopping the Amadeus Syndicate from releasing its supervirus. Here, Nadia is a stand-in for Eri, who had been assigned to other duties. The one thing putting her apart from Eri is that her alternate melee weapon is a souped-up taser, capable of shredding the enemy. Unfortunately, due to some in-game bugs, she doesn't get as many points for using her melee.
140----
141* ActionGirl: Runs and guns with the best of them.
142* BigEater: Compared to the other characters whose powerup relies on eating, she takes it up a notch. Her idle animation almost always leads her grabbing a bite on a chocolate bar.
143* BalloonBelly: Almost on a daily basis due to her being the biggest BigEater of the group, surpassing fellow female Fio.
144* FormerlyFat: Well, except the ending has her eating a big feast alongside the other heroes. And with Nadia being the biggest eater of the group, she'll likely be fat again in the future.
145* GirlyBruiser: Especially her Valentine's Day outfit in ''Defense'' and ''Attack''. [[LethalJokeCharacter This doesn't stop her from kicking ass, though.]]
146* GirlishPigtails: As evidenced by the fact she joined the military not to prove herself, defeat evil, or a love of fighting, she's just a girly girl who joined for girlish reasons. Her hair is appropriately in pigtails.
147* GirlyGirlWithATomboyStreak:
148* MsFanservice: Moreso than Eri, due to Nadia having the 2nd biggest breasts of the female playable cast next to Fio, she's even this when sporting BalloonBelly.
149* MundaneUtility: Joining the military in the midst of open conflict apparently seems like an easier way to lose weight than ''just eating less'' to Nadia, except for the fact that the game is literally a food filled paradise for a BigEater like Nadia.
150* RoseHairedSweetie: She's definitely the cutie and probably the least militaristic of the protagonists, fitting her pink hair.
151* SetSwordsToStun: Inverted. Her taser is set to essentially killing her victims outright like the rest of the team's melee attacks.
152* SpyCatsuit: "Special Nadia's" outfit.
153* SignedUpForTheDental: Joined the military as a way to exercise and lose weight, except she would rather eat and get fat.
154* SignificantGreenEyedRedhead: RoseHairedSweetie with green eyes in her portrait.
155* StaticStunGun: She uses a taser as her melee attack.
156* SuspiciouslySimilarSubstitute : To Eri, in terms of animations, she's also bustier than Eri by a lot.
157* WeightWoe: The main reason she joined the military is to lose weight, according to her desire to become a supermodel. Unfortunately this gets conflicted to the fact when she's admitted to be a known BigEater which she's proud of and won't stop eating, which is made worse as the series is well known for its abundance of food items lying around.
158[[/folder]]
159
160[[folder:Trevor Spacey]]
161[[quoteright:328:https://static.tvtropes.org/pmwiki/pub/images/msd___trevor_spacey.png]]
162 [[caption-width-right:328:"I'm going to make scrap metal out of you, pal!!"]]
163
164Trevor received his first computer at age three. By the time he was seven, not only could he perform complex coding, he also worked on creating antivirus programs during summer break, many of which are still in use at the school he attended. When he ended up joining the Peregrine Falcons, he found a great deal of respect for Marco, whose own computer skills surpassed his own. Here, he acted as Tarma's stand-in. His melee involves kicking the enemy so hard, it shreds them apart; he gains double points for this, but he has to hold still.
165----
166* ArmedLegs: His melee is a powerful kick called Knife Boots.
167* AsianAndNerdy: Korean and a PlayfulHacker.
168* ChildProdigy: Literally owns and uses a computer since he was [[ImprobableAge three years old]].
169* TheCracker: Zigzagged with PlayfulHacker. Becomes the Regular Army's support hacker and a sideline commando.
170* NonstandardCharacterDesign: Sprites-wise, Trevor is the only male who normally has sclera around the pupil (most have BlackBeadEyes).
171* ObliviousToLove: More like he doesn't know that [[CrushBlush Abigail blushes]] at the sight of him.
172* PlayfulHacker: A point which causes him to get along with Marco, another playful hacker.
173* TheSmartGuy: An ingenious hacker.
174* SuspiciouslySimilarSubstitute : To Tarma, who was not playable in his game.
175[[/folder]]
176
177!!''Metal Slug: 2nd Mission''
178
179[[folder:Gimlet]]
180[[quoteright:226:https://static.tvtropes.org/pmwiki/pub/images/msd___gimlet.png]]
181
182A recruit in the Peregrine Falcons squad who while on his way to investigate the Rebel Army's goals stumbled upon startling info from a rescued hostage: the rebels have made contact with aliens! After his requests for backup were ignored, he reluctantly decides to face the enemy himself.
183----
184* SuspiciouslySimilarSubstitute: Of Tarma, sans shades.
185[[/folder]]
186
187[[folder:Red Eye]]
188[[quoteright:265:https://static.tvtropes.org/pmwiki/pub/images/64feb4b319d2a90ccdb419bca017977a.png]]
189
190A member of the Government Forces' Special Forces. Like Gimlet, she too stumbled upon info regarding the Rebels making contact with aliens while investigating a UFO sighting. After learning that Gimlet has decided to engage the enemy, she gives chase, not wanting to be beaten to the action.
191----
192* MacrossMissileMassacre: Favors an [=M202=] FLASH like rocket launcher.
193* SuspiciouslySimilarSubstitute: Of Fio, except she wears red, doesn't have nearly as big of a bust (making Red Eye the least endowned female of the group, even less so than Eri). And doesn't wear glasses.
194[[/folder]]
195
196!!''Metal Slug Advance''
197
198[[folder:Walter Ryan]]
199[[quoteright:335:https://static.tvtropes.org/pmwiki/pub/images/msd___walter_ryan.png]]
200 [[caption-width-right:335:"I'd rather be pumpin' iron."]]
201
202Walter joined the Peregrine Falcons squad with the hopes to train his mind and body, knowing he had the stamina to keep up with the rest of them. However, he never would've guessed his initial "training" would turn out to be a rescue mission.
203----
204* FallingIntoTheCockpit: An early training mission became a very real mission as his drill instructor turned out to be TheMole.
205* MamasBoy: His hobby is listed as "phoning his mama."
206%%* PaletteSwap: To Marco.
207%%* SuspiciouslySimilarSubstitute: Again, to Marco as the main "guy" character.
208[[/folder]]
209
210[[folder:Tyra Elson]]
211[[quoteright:295:https://static.tvtropes.org/pmwiki/pub/images/story_act_127.png]]
212 [[caption-width-right:295:"I guess everything's up to me."]]
213
214Tyra's strong desire to fight evil is what motivated her to join the Peregrine Falcons alongside Walter. After getting the highest score on the written test, she was immediately put to the physical training course on the island where the game takes place.
215----
216* FallingIntoTheCockpit: An early training mission became a very real mission as her drill instructor turned out to be TheMole.
217* PaletteSwap: She uses an edited version of Nadia's sprites.
218* RevolversAreJustBetter: Defaults to a revolver, as shown in her official art.
219* TheSmurfettePrinciple: The only female to be a member of the PF Squad. Every other female is on the SPARROW Squadron.
220* SuspiciouslySimilarSubstitute: Has the same outfit as Nadia, her hair is also a red hue, and introduced as a new female character along side a new male character.
221[[/folder]]
222
223!!''Metal Slug Mobile''
224
225[[folder:Nathalie Neo]]
226[[quoteright:289:https://static.tvtropes.org/pmwiki/pub/images/2813036_1624486184_latest.png]]
227A member of the Sparrows division.
228----
229* BashBrothers: Works with Ralf in games she stars in.
230[[/folder]]
231
232[[folder:Roberto Nicola]]
233[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/story_act_048.png]]
234A member of the Peregrine Falcons.
235----
236* AscendedFanboy: Was overjoyed to work with Fio, one of his favorite soldiers.
237* BashBrothers: Works with Leona in games he stars in. In ''Metal Slug Attack'', he is partnered with Fio.
238* LimitBreak: The Roberto Combination, which is a set of shots from his gun and some bomb throws.
239* TraumaButton: Gets overly suspicious to any beautiful woman he gets in contact with. This is because in his first mission, he once got frozen by Beatriz posing as a helpless civilian.
240[[/folder]]
241
242[[folder:Alisa Stewart]]
243[[quoteright:236:https://static.tvtropes.org/pmwiki/pub/images/msd___alisa_stewart.png]]
244A former mechanic of the Regular Army before joining as a soldier. Alisa is able to use her parachute in mid-air.
245----
246* DramaticWind: Her victory animation has Alisa removing her hat and letting the wind blow her hair out no matter the location.
247* HammerspaceParachute: She can deploy as many as she pleases.
248* IdenticalStranger: Her ''Metal Slug Defense'' artwork has her similarly designed as Fio.
249* WrenchWhack: Uses a wrench as her melee attack.
250[[/folder]]
251
252!VideoGame/IkariWarriors
253
254Ralf and Clark, in between their appearances in ''VideoGame/TheKingOfFighters'' series, appeared alongside the core team for ''Metal Slug 6'', and are back for ''Metal Slug 7/XX''. Joining them in ''XX'' is Leona and later Whip and Heidern in ''Metal Slug Defense''. A better amount of information about these five can be found on their respective series' page.
255----
256* BroadStrokes: Both Ralf and Clark were involved in a TrappedInAnotherWorld plot involving space aliens in the second ''Ikari Warriors'' game, ''Victory Road'', making this into a MythologyGag as well.
257* CanonImmigrant: They originally came from ''VideoGame/IkariWarriors'' (Ralf and Clark) and ''VideoGame/TheKingOfFighters'' (Heidern, Leona and Whip) before making the jump to ''Metal Slug''.
258* HiredGuns: Unlike the rest of the Regular Army, they're not part of the group; they're a mercenary squad offering their services to them.
259
260[[folder:Ralf Jones]]
261[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/81fdedc32cdb5b6b070651d65a7bd7e632cc38cer1_428_423v2_hq.jpg]]
262 [[caption-width-right:350:"OK, let's get this done!!"]]
263-->Debut: ''Metal Slug 6''
264
265Aside from his participation in various fighting tournaments, little to nothing else is known about him or Clark. There's rumors flying around, but he tends to ignore them.
266
267Though carrying half as much ammo and grenades as anyone else, Ralf makes up for this with his Vulcan Punch, capable of destroying tanks, and his melee speed is much faster than anyone else's (and his normal melee can also damage things that others cannot). He's also the only character capable of taking two hits. He's just that tough.
268----
269* BladeEnthusiast: Collects knives as a hobby. And his normal attack (unless you use an alternate melee) has him use knives in combat.
270* DashAttack: His ''other'' special move, the Galactic Phantom Punch.
271* HeterosexualLifePartners: With Clark.
272* HotBlooded: The guy is willing to charge armed soldiers and ''tanks'' with his bare hands.
273* LightningBruiser: He can run and jump as well as everyone else, has fast (and highly damaging) melee attacks, and takes 2 hits to kill, unlike most of his allies.
274* MadeOfIron: To the point that he can survive getting hit with a ''tank'' shell and keep on fighting like a pro. The one thing that can insta-kill him are incendiary weapons, man eaters, electric based weapons, being crushed, and bottomless pits.
275* OlderThanTheyLook: He was born in 1992, making him 13 years older than both Marco and Tarma, 16 years older than Fio, 18 years older than Eri and about 40 years old by the time of his first appearance. Official art still depicts him as looking just as young as Marco and Tarma.
276* OneHitPointWonder: Averted; he can take ''two'' hits, unlike every other protagonist. That said, certain things can still kill him in one hit as mentioned in Made of Iron above.
277* RapidFireFisticuffs: His special move, the Vulcan Punch.
278* RedOniBlueOni: The red to Clark's blue.
279[[/folder]]
280
281[[folder:Clark Still]]
282[[quoteright:281:https://static.tvtropes.org/pmwiki/pub/images/msd___clark_still.png]]
283 [[caption-width-right:281:"Hey, come on!!"]]
284-->Debut: ''Metal Slug 6''
285
286Clark and Ralf have been longtime friends, even in the unit the two of them are assigned to.
287
288Clark's unique ability is his Super Argentine Backbreaker, a special melee move capable of earning him a lot of points in a short time frame. He also gains a small window of invulnerability with each enemy he tosses with this. However, it only works on certain human-sized enemies.
289----
290* CoolShades: Much like Tarma. Echoing Tarma's relationship with Marco, the shades serve to differentiate Clark and Ralf.
291* DifficultButAwesome: If you can overcome its short range and target limitations, the Super Argentine Backbraker will rip nearly any horde of (human) mooks a new one, earning you tons of points and a lot of invincibility time.
292* HammerSpace: In ''Defense'', his special move is to pull out a large ExplodingBarrel and hurl it. In ''Attack'', his "Jet Clark" variant throws refrigerators.
293* HeterosexualLifePartners: With Ralf. They've been together for years in several combat theaters.
294* HumanHammerThrow: Thanks to his Argentine Backbreaker, Clark can send enemies roughly the same size as him flying aside with deadly effect.
295* RedOniBlueOni: The blue to Ralf's red. He's less hot blooded and more stoic.
296* TheStoic: Even when suplexing enemy soldiers, he's not exactly a ScreamingWarrior.
297* StoneWall: As Jet Clark, his ability to throw refrigerators to use as blockades make him very hard to wear down.
298* WrestlerInAllOfUs: His Backbreaker.
299[[/folder]]
300
301[[folder:Leona Heidern]]
302[[quoteright:339:https://static.tvtropes.org/pmwiki/pub/images/msd___leona_heidern.png]]
303-->Debut: ''Metal Slug XX''
304
305Leona was adopted by Commander Heidern following her involuntary transformation and slaughter of her hometown, and Clark and Ralf helped to oversee her training.
306
307Leona joins the team for ''XX'', but has to be unlocked via DLC (she's only 99 cents, well worth it); the [=PS4=] version includes her automatically. She carries an amalgamation of everyone else's skills (stronger pistol fire, 20% more ammo and grenades, Slugs can take an extra hit, and she retains her weapons after losing a life. Interestingly, her special melee, Moon Slasher, can destroy bullets). According to her profile, Clark, Fio and Leona finished a mission that also further bonded the three as being good friends.
308----
309* AllYourPowersCombined: In ''XX'', she has basically everyone else's special skills.
310* AscendedExtra: Originally appeared in a cheap cell phone game before being moved to the main series.
311* CatGirl: By donning cat ears, she can decrease her hit points while increasing her attack.
312* CloseRangeCombatant: In ''Defense'', her moon slasher is her only move.
313* GuestFighter: She originates from ''VideoGame/TheKingOfFighters'' series.
314* MythologyGag: Her "Silent Soldier Leona" unit, based on one of her ''[=KoF=]'' incarnations, has a victory pose where Chang Koehan appears in a thought bubble.
315* SignatureMove: Her Moon Slasher, originally from ''KOF'' is a [[RazorSharpHands chop attack]] that destroys projectiles, and essentially turn into an absolute GameBreaker if one knows how to use it consecutively and quickly.
316* TrueCompanions: With Ralf and Clark, ever since ''KOF '96.''
317[[/folder]]
318
319[[folder:Whip]]
320[[quoteright:231:https://static.tvtropes.org/pmwiki/pub/images/msd___whip.png]]
321-->Debut: ''Metal Slug Defense''
322
323Whip makes her debut in ''Metal Slug Defense'' as part of the ''King of Fighters'' faction. Since the ''KOF'' faction does not exist in ''Metal Slug Attack'', Whip has been moved to the P.F. faction.
324----
325* CastHerd: Whip was separated from Ralf, Clark, and Leona in ''Defense'', since the latter three are part of the P.F. faction. While she eventually joined alongside them in the same faction in ''Attack'', Whip is not part of the Wrath team, rather being placed next to the Slugnoid Type-B for the Agent Sally team.
326* LastEpisodeNewCharacter: Whip and Heidern were the final units implemented in ''Metal Slug Defense''.
327* RevolversAreJustBetter: Her special attack is shooting a bullet from a golden revolver. Its range is short in ''Defense'' and much farther in ''Attack''.
328* WeaponSpecialization: Her standard attack is a whip swing. Her whip is able to cause knockback in ''Attack''.
329[[/folder]]
330
331[[folder:Heidern]]
332[[quoteright:314:https://static.tvtropes.org/pmwiki/pub/images/msd___heidern.png]]
333-->Debut: ''Metal Slug Defense''
334
335Heidern makes his debut in ''Metal Slug Defense'' as part of the ''King of Fighters'' faction. Since the ''KOF'' faction does not exist in ''Metal Slug Attack'', Heidern has been moved to the P.F. faction.
336----
337* CastHerd: Heidern was separated from Ralf, Clark, and Leona in ''Defense'', since the latter three are part of the P.F. faction. While he eventually joined alongside them in the same faction in ''Attack'', Heidern is not part of the Wrath team, rather being placed next to the Donkey Slug (Eri) for the "Operation Ikari" team.
338* EarlyBirdCameo: Appeared as a drill instructor in ''Defense'''s Combat School before becoming a playable unit.
339* HiredGuns: The leader of the Ikari Warriors, who sends his troops to the Regular Army whenever there's a big conflict.
340* LastEpisodeNewCharacter: Whip and Heidern were the final units implemented in ''Metal Slug Defense''.
341* LifeDrain: His special attack has him jump and suck the life of the closest unit.
342* PrecisionFStrike: [[PunctuatedForEmphasis Go. To. HELL!]]
343* RazorWind: His long-range attack.
344[[/folder]]
345
346!Antagonists (By faction)
347
348!!Rebel Army
349[[folder:Rebel Army]]
350[[quoteright:720:https://static.tvtropes.org/pmwiki/pub/images/img_0124.jpeg]]
351
352-->Debut: ''Metal Slug''
353
354The primary antagonists of the series, the Rebel Army was formed when Morden defected from the Regular Army over the deaths of his family. As he was AFatherToHisMen, they followed him out of sheer loyalty, and after merging with various terrorist groups, proved to be so dangerous that the Regular Army were forced to get their act together. Fanatics to the extreme, they would do whatever it took to overthrow the world's governments and install their own, even siding with alien invaders to get the job done. That said, they're certainly not stupid, and will side with the Regular Army to deal with threats far greater than them.
355----
356* ArmiesAreEvil: Pretty much, though they're more comedic than one's usual evil army.
357* ArmyOfThievesAndWhores: They certainly fit this trope after merging with the terrorist groups that had been plaguing the Regular Army for some time. However they all seem to get along pretty well and are zealous in their loyalty to Morden. Further shown in ''Metal Slug Attack'', where multiple factions exist within the army, but they're all unified in their loyalty to Morden. Even the soldiers forced into conscription have been shown to eventually develop a loyalty to their squad and their general.
358* ArtificialBrilliance:
359** The Rebel riflemen display a surprising level of [[https://www.youtube.com/watch?v=93ljVIm3WfY competence]] not seen in other ranks; they regularly hide behind available cover (and will not take action if they are under sustained fire), will switch from cover-to-cover if their opponent jumps to their direction, will immediately duck back to cover if a player takes a shot too early, and swiftly duck from gunfire if they are not firing.
360** The orange hazmat Rebels, although they cannot dodge gunfire, are much more intelligent; they will actively [[https://www.youtube.com/watch?v=nwXwL_K8D4Q back away]] from thrown grenades and will not attempt to advance, so long as the player keeps throwing grenades at them.
361* {{Determinator}}: Even after half a dozen games of getting slaughtered by the heroes, it is impressive to see that they're still trying to take over the world in spite of all their setbacks.
362* EliteMook: Some of their future soldiers in ''7'' are tougher variants of normal Rebels, such as their homing missile mooks shooting three missiles instead of one and their shield mooks being able to attack without dropping their force field.
363* EnemyMine: Though they oppose the Regular Army, they will join forces with them to deal with greater threats such as the Mars People and the Invaders.
364* LaughablyEvil: For an evil army, yep. It's very common to catch them sleeping or simply off-guard (having a cookout, tanning on a beach, etc.), and they die in fairly comedic ways.
365* MadeOfPlasticine: Applies to the mooks, since one bullet is all that is needed to take them down. Of course, [[VideoGameCrueltyPotential the heroes can keep shooting at them to earn more points until they fall over dead]].
366* MascotMook: They've appeared in nearly every game barring ''4'' (where the Amadeus Syndicate are impersonating them) and ''5'' (where they got replaced by the Ptolemaic Army).
367* NebulousEvilOrganisation: As the biggest terrorist organization to be formed, even largely consisting of former terrorist groups.
368* PuttingOnTheReich: They are WesternTerrorists (led by the North Americans, after all) who resemble ThoseWackyNazis in their uniforms and flags.
369* TheRevolutionWillNotBeCivilized: Downplayed. They are a rebel group fighting against the government, though, while they achieve violent means to do so, they do not indiscriminately kill civilians in their revolution.
370* StupidJetpackHitler: This is the [[NextSundayAD 2020s/2030s]], and even though they're not really Nazis (or even Neo-Nazis, for that matter), they still have some impressive war machines and weapons that can give the Regular Army a run for their money, and they always manage to make more after every defeat.
371* SuicideAttack: To show their undying loyalty to Morden and to showcase their fanaticism, some of the soldiers are very willing to strap explosive oil drums or missiles on to their backs to act as suicide bombers. The former is notable, as they have access to conventional sea mines, yet there are those who act as suicide bombers in the hopes of obliterating their targets.
372* UndyingLoyalty: They bear a strong loyalty to Morden, since he is AFatherToHisMen. One of the fastest ways to get them to work with the protagonists is any part of the Rebel Army finding out that their General is in danger.
373* VillainsOutShopping: Some soldiers can be seen doing mundane things, such as sunbathing, sitting round a campfire or playing a handheld console.
374[[/folder]]
375
376[[folder:Donald Morden]]
377[[quoteright:316:https://static.tvtropes.org/pmwiki/pub/images/brwj2ymdufozvhwsfqrg1spujuvee6evendmymugqe6vzphc.png]]
378-->Debut: ''Metal Slug''
379
380Morden was formerly a Vice Admiral in the Regular Army Marine Corps. Though a tough and efficient commander, he was also something of AFatherToHisMen, which greatly helped him to earn their respect.
381
382Things went well for Morden, up until the Central Park bombing, which not only took away his right eye (hence the eyepatch he wears), but it also killed his wife and daughter. To twist the knife even further, he later found out that Regular Army Intelligence knew about the bomb threat and pushed for the high command to stop it, but due to rampant corruption in the system at the time, the higher-ups dismissed the threat as being a mere prank or so (later blaming the bombing on a lack of intel, even though they clearly had the intel to begin with), which, when combined with his emotional instability and rampant alcoholism following afterwards, ended in Morden's resignation.
383
384When Morden left, all of the soldiers under his command (including Allen O'Neil) followed him out of sheer loyalty to him. This allowed him to form the Rebellion Army, and he began making swift tactical moves against the Regular Army, nearly destroying them and finally motivating them to get their act together. In fact, during his attack on the president, he gained his nickname as the "Devil Reborn", due to just how frightening he was.
385
386Though he is the main threat in ''Metal Slug'', in ''Metal Slug 2'', it turns out he teamed up with the Mars People, who gave him the technology he needed, but were quick to turn on him. He barely showed up in games ''3'' (where a Mars Person is impersonating him) and ''4'' (there are robotic duplicates of him, possibly including the one in the intro demo), and is completely absent in ''5'', but makes a return in ''6'', where he (again) makes a pact with the Mars People, but this time, due to the Invaders invading, it is soon under different terms. Taking a certain route in Stage 4 will mean that he is the one who actually saves the player at the end of the game.
387
388His biggest return to the spotlight was in ''7''/''XX'', where it turns out his own soldiers, from some unspecified time in the future, went back in time to help him out, again out of sheer loyalty to him.
389----
390* ArchEnemy: To Marco, as he was responsible for most of Marco's comrades being killed in his attacks.
391* BadassNormal: If he is abnormal in any way, it's probably [[ActuallyADoombot not actually Morden]]. Doesn't stop him from trying to fight the heroes personally throughout the series, even fighting you directly early in the original game.
392* BigBad: For most games, though sometimes he gets the title hijacked.
393* BigDamnHeroes: If the player took the top path in Mission 4 in ''Metal Slug 6'', [[spoiler:he appears to save them from a great fall after the Invader king dies]].
394* CanadaEh: Hails from Canada, and has some hobbies that are stereotypical of Canadians like hunting and building log cabins according to his profile.
395* CigarChomper: It is not shown in the games, but his profile reveals that he likes to smoke cigars before heading off to battle.
396* ComedicUnderwearExposure: Gets stripped to his underwear by the Mars People in ''2/X'' and ''3'', and gets his pants pulled off by the Invaders in ''6''.
397* CoolPlane: Despite being an army general, he seems to have a strong preference to copters and planes (the Hi-Do attack helicopter and Hairbuster Ribert) over tanks. The few times he is in a tank, it is a method of defense, not hiding.
398* CreateYourOwnHero: He abandoned the Regular Army because of its incompetence and corruption, and then nearly wiped them out. But the remnants of the Regular Army finally got serious and actually heroic so they could defeat him.
399* CynicismCatalyst: For Morden, it was losing his family and eye to a terrorist attack that could have easily been prevented were it not for corruption within the Regular Army.
400* EvilLaugh: Tends to laugh in a mocking tone upon approaching the player.
401* EvilerThanThou: Frequently on the receiving end of this.
402* EyepatchOfPower: The man certainly looks imposing thanks to his eyepatch.
403* AFatherToHisMen: Treats his men as if they are family, which led them to follow him out of loyalty when he defected and keep them fanatically loyal to him in the present.
404* FinalBoss: Of the original and of ''7/XX''.
405* GeneralRipper: Right there in the name, though he was originally a Vice-Admiral in the Regular Army.
406* JokerImmunity: Despite being defeated and/or doublecrossed whenever he appears, he always survives to lead his army again.
407* KarmicButtMonkey: Appearing on screen is usually a sign that he'll suffer a HumiliationConga. Considering he is a great terrorist leader and sometimes a legitimate threat to the heroes, it's not completely undeserved.
408* MadeOfIron: When riding the Hairbuster Riberts and the Hi-Do in the first game, he can take an absurd amount of bullets than even Allen O'Neil could barely withstand. Only upon the destruction of his personal twin bladed helicopter that he goes down, alive but out.
409* NoCelebritiesWereHarmed: His design is quite blatantly a parody of UsefulNotes/SaddamHussein.
410* NotMeThisTime: Against all expectations, he is ''not'' the main villain of ''4''. The Amadeus syndicate actually abuses this expectation, having robot copies of both Morden and Allen.
411* RankScalesWithAsskicking: Don't let his ButtMonkey tendencies fool you. He is strong enough to endure plenty of shots and wield a bazooka when he actually is fought, and is also good at fighting with flying machines and the giant Kraken.
412* RedBaron: "The Devil Reborn", a moniker he got during his attack on the president due to just how terrifying he was.
413* ShadowArchetype: He could be seen as this to Heidern, since both were military men who lost their eye and loved ones to circumstances beyond their control (for Heidern, he lost his family to [[VideoGame/TheKingOfFighters Rugal]], while Morden lost his family to a terrorist attack), the difference being that Heidern would go on to adopt Leona and move on from his past after Rugal's demise, whereas Morden...[[StartOfDarkness didn't]].
414* VillainDecay: Morden goes on this trope after ''2''. In fact, the only time he has been the FinalBoss since then was ''7''.
415* VillainTakesAnInterest: One story in ''Attack'' has him take an interest in Leona's [[VideoGame/TheKingOfFighters Orochi]] power after she underwent the Riot of the Blood, ordering Abigail to get samples from her and send them to Navy for further study.
416* WellIntentionedExtremist: Distraught over the death of his wife and daughter in a terrorist attack that could have been prevented and angered at corruption in the Regular Army, he abandoned the Regular Army and formed his own terrorist group, the Rebel Army, and while he plans on removing corruption from the world, his ultimate goal is to create a world-wide military dictatorship.
417* WesternTerrorists: He's Canadian and leads the global-wide Rebel Army.
418[[/folder]]
419
420[[folder:Allen O'Neil]]
421[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/allen_oneil.png]]
422 [[caption-width-right:350:"See you in hell..."]]
423-->Debut: ''Metal Slug''
424
425Morden's right hand man and his best fighter. When Morden resigned from the Regular Army, Allen (alongside all of Morden's supporters) followed him out. He is mostly known for his ''extreme'' endurance, capable of taking insane amounts of punishment and supposedly being killed each game (he is eaten by an Orca in ''Metal Slug 2/X'', which ''spits out his bones''), only to return later. In ''Metal Slug 3'', he not only dies, but comes back in the same level. Aside from being nigh unkillable, he also has a wife and son to return home to at the end of the day.
426
427He appeared in ''Metal Slug 4'''s second and final stages, whereupon fighting him at the latter reveals him to be a machine, possibly meaning the heroes also fought a robot Allen back in Stage 2. He comes back for ''Metal Slug 7''/''XX'' in a Rebel Gigant, still spouting his trademark quips and insults.
428----
429* AssistCharacter: In the soldier minigame in the console port of ''3'', he acts as the Rebels' "bomb" when summoned, shooting up any Martians that are in the way. [[spoiler:He also shows up in the third game's final mission proper during the clone corridor sequence helping the player fight off clones.]]
430* BadBoss: Due to a quirk in ''X'', he has a tendency to kill his own troops in his attempts to kill the player characters. This is a sharp contrast to his Sergeant Rock characterization where he enjoys fighting alongside with his men.
431* BaldOfEvil: His hair is shaved bald and he is a part of antagonistic military force.
432* {{BFG}}: Wields a large machine gun one-handed whenever he is fought, which is typically meant for a two-man team to operate.
433* BloodKnight: He even leads his own squadron in ''Attack'' called the "Allen Platoon", who are this trope to the extreme.
434* BossBanter: He loves dishing these out.
435--> "C'MON, BOY!"\
436"YOU'RE MINCEMEAT!"\
437[[{{Engrish}} "GO HOME TO MOMMY!"]]
438* ADayInTheLimelight: He is the player character for the (Japan Only) ''Metal Slug: Allen's Battle Chronicles'' game and its enhanced American port, ''Metal Slug Mobile 3''.
439* TheDragon: To Morden who acts as his best combatant.
440* DuelBoss: He almost always provides the player with a Heavy Machine Gun before his fight, to be a match against his own. In ''7'' he wields a Slug Gigant, which is matched by the player's own Gigant (though the fact that the two use the same weapon is happenstance in this case). The one time he uses a clearly advantageous weapon without giving the player something to compensate, [[spoiler:it turns out to be a robot duplicate replacing him.]]
441* {{Eagleland}}: Type 2, a loud, boorish, towering macho muscleman who loves to shoot stuff up with his [=M60=] MG and blow everything with grenades.
442* EvenEvilHasLovedOnes: He has a son (Allen Jr., shown below) and wife, which according to WordOfGod is why he keeps coming back from the grave, so he can see them again.
443* EvilCounterpart: To the player character, on the grounds of both characters having similar abilities (Heavy Machine Gun, grenades, melee attacks...), the difference being that he can take way more punishment before giving up the ghost as opposed to the player (who is a OneHitPointWonder, though they both can come back from the dead if the player has extra lives).
444* {{Hunk}}: Is absolutely ripped, and along with his height, gives him an intimidating presence.
445* IShallTauntYou: Loves to throw insults at his foes as he fights them.
446* JokerImmunity: Like Morden, he always keeps coming back, despite having been riddled with bullets and falling to his death in the first game, the second having him fall down to the ice water but apparently getting eaten by an Orca (which spits out his bones afterward). The third game doesn't have anything notable besides him collapsing and falling about twenty feet, but his body still vanishes like regular enemies do after the fight. In ''Attack'' he gets impaled by Caroline's Augensterm and ''electrocuted'' in an Extra Ops story.
447* ImplacableMan: He cannot be stopped. Just shooting him alone is barely going to phase him.
448* ImprobableWeaponUser: Get too close to him and he'll slap you with the ammo belt of his machine gun, which will actually kill you stone-dead.
449* LargeHam: He is the only character in the ''Metal Slug'' franchise to actually have spoken lines. And they are ''ALL'' taunts! He doesn't speak in ''4'', though, [[spoiler: which ends up being a giveaway that you're not fighting the real Allen.]]
450* LightningBruiser: Despite being bigger than the playable characters, he's also faster than them.
451* MadeOfIron: He is a human (except in 4), just like the player characters. Unlike [[OneHitPointWonder the player characters]], he has an ''obscene'' amount of health for a human, being able to last longer than a tank!
452* MirrorBoss: He is basically similar to the player character, using a Heavy Machine Gun like yours, stick grenades, and even a melee attack. The difference is that the heroes take only {{one hit|PointWonder}} (except for Ralf who can take two), he takes more than ''[[MadeOfIron several dozen]]''.
453* OneManArmy: Famed in-universe as one, as evidenced by his RedBaron entry below. This gets shown in-game during EnemyMine situations, where he's fully capable of fighting off hundreds of enemies all by himself.
454* RedBaron: Known in-universe as the "Fearsome Army of Trillion".
455* RecurringBossTemplate: In any game of the franchise, the moment you enter an area with two platforms on either side, you'll be facing Allen within ''seconds''.
456* SeeYouInHell: This is his catchphrase whenever he goes down.
457* SergeantRock: A villainous version, ''Attack'' reveals he likes getting close to the frontlines to the point of [[DecliningPromotion refusing to get promoted]] just so he can fight on the battlefield.
458* StrongAsTheyNeedToBe: When normally fought, he can absorb lots and lots of punishment before he eventually goes down. [[spoiler:During the final segment in ''3'' where he assists the Regular Army commandos in combating an army of clones (if they are not inside an SV-001 Slug), he can only withstand a few hits.]]
459* TurnsRed: His skin turns more and more red as he takes more damage, and he accordingly speeds up.
460* UnexplainedRecovery: All the time, despite apparently dying every game he appears in. Bonus points for ''Metal Slug 2'' where he gets eaten by an orca (that spits out his bare bones afterward), and ''Metal Slug 3'' for having him return during the attack on the Mars Peoples' Mothership despite you apparently killing him in the same level.
461* WalkingShirtlessScene: He is always seen without his shirt, even in cold place like Siberia or Alaska.
462[[/folder]]
463
464[[folder:Abul Abbas]]
465[[quoteright:333:https://static.tvtropes.org/pmwiki/pub/images/msd___abul_abbas.png]]
466-->Debut: ''Metal Slug 2/X''
467
468The leader of the Arabian forces, Abul Abbas made an alliance with the Rebel Army. After their defeat in mission 1, a few Arabian rebels show up in the beginning of mission 2 as a last ditch effort.
469----
470* BadBoss: He has a terrible habit of refusing to own up to his own mistakes. In ''Attack'' he refuses to let his own troops stop to refuel their units, then blames them for running out of fuel at a critical moment.
471* FatBastard: He is noticeably overweight and is also a villain.
472* HoistByHisOwnPetard:
473** The player is able to kill Abul in ''X'' [[https://www.youtube.com/watch?v=KvVvzMGFmoM if one of Iron Nokana's shots]] [[https://www.youtube.com/watch?v=N8WF2_hQDzo lands on him]] during the [[ScoreScreen "Rescued Prisoners" screen]].
474** Accusing his soldiers of laziness when they want to stop to refuel their vehicles bites him in the rear when their vehicles run out of fuel.
475* IShallTauntYou: Shows up multiple times commanding his troops and taunting the player.
476* KnowWhenToFoldThem: Waves a white flag once things go bad for him.
477* NeverMyFault: Has a bad habit of blaming his soldiers for his own mistakes, which oftentimes comes back to bite him in the ass.
478* NotSoHarmlessVillain: While he is one of the least threatening villains in the series, being a poor fighter and a poor strategist, he nevertheless managed to recruit the fearsome assassin Shizuka through his own merits in the ''Extra Ops''.
479* StarterVillain: He serves as a first-level foe whose army is even worse equipped than the Rebels, and his troops lose all presence after the first level.
480* TheUnfought: The player ends up fighting the mission's boss while ignoring Abul in the background.
481* WhiteFlag: Raises one on his sword when he surrenders after things go south.
482[[/folder]]
483
484[[folder:Future Soldiers]]
485-->Debut: ''Metal Slug 7/XX''
486
487Morden's own troops from an unspecified time in the future. Presumably at some point in time after Morden was captured or killed, his own forces (again out of loyalty) gathered up their technology and, though the construction of what appeared to be a time window or portal, went back in time to help Morden out before he dies. Despite having new weapons and upgraded machinery, they still got their asses handed to them, and with their time portal destroyed, they were unable to do anything else.
488----
489* CreativeSterility: Exaggerated to the point of hilarity, even though they came from the future (which the technological edge expected of this), their military vehicles (apart from the Slug and Rebel Gigant, Big Gate, their Mecha Mooks, and the Kraken) are all identical in appearance and design to their past counterparts. By contrast, the Ptolemaic Di-Cokka and Girida-O at least sport a modernized design that make them distinct, despite being reverse engineered from a stolen Regular Army discs (which also contain data from Rebel vehicles).
490* EliteMooks: They are essentially upgraded Rebels, sporting advanced combat uniforms, weapons, and arsenal. Some even use nifty new tools such as a backpack that either launch Drop Shot-like mines, and micro-missiles. They still go down in one hit though.
491* MechaMooks: They gradually deploy these, ranging from Laser Drones, Pods, and the Rebel Walkers.
492* MakeWrongWhatOnceWentRight: Their goal: give Morden the necessary resources to defeat the Regular Army and change history in their favour. Unsurprisingly, they fail.
493* TrappedInThePast: Their ultimate fate after their Big Gate got destroyed.
494[[/folder]]
495
496[[folder:Allen O'Neil Junior]]
497[[quoteright:310:https://static.tvtropes.org/pmwiki/pub/images/d85nglu_76b8a292_da68_4237_8cd4_5cc568c09bc6.png]]
498-->Debut: ''Metal Slug Advance''
499
500The son of Allen O'Neil himself. He posed as a training instructor, which allowed him access to the island where the Peregrine Falcon trainees were undergoing the test. From here, he was able to lead some of Morden's forces to launch a surprise attack on the trainees, capturing the most of them and allowing Morden's troops to set up a base.
501
502Unlike his father, though, Junior tends to act more strategically in direct confrontation against the player. However, once injured past a certain point, he eventually loses his temper and starts acting more like his father in battle. However, finding and defeating him is easier said than done.
503----
504* GenerationXerox: Just like his dad, though he does try to act smarter than him.
505* InTheBlood: He tries to act smarter than his father, and indeed becomes more successful in attacking the Regular Army than him, but in the end gives in to the same rage his father is known for.
506* LikeFatherLikeSon: Get him mad enough, and he'll end up just like his father.
507* TheMole: He infiltrated the Regular Forces training camp by posing as a drill instructor.
508* PistolWhipping: One difference from his father is that he does ''not'' typically use a knife, instead preferring to slam his opponent with his ammo belt, which is one of the few non-lethal attacks in the game.
509[[/folder]]
510
511!!Martians
512
513[[folder:Mars People]]
514[[quoteright:280:https://static.tvtropes.org/pmwiki/pub/images/msd___mars_people_5.png]]
515-->Debut: ''Metal Slug 2/X''
516
517A race of squid/jellyfish-like aliens hailing from Mars (obviously). They possess spaceships straight out of a 50's B-movie and allied themselves with Morden, but were really using him to weaken Earth's defenses so they could take over with little to no opposition. Though defeated at the end of 2/X, they kidnapped Morden before the events of ''3'', sending a Mars Person to impersonate him, and eventually capturing one of the player's characters and creating clones of him/her.
518
519At the onset of ''Metal Slug 6'', it appears as though they've allied with Morden again, but this time it was to find their leader, Rootmars. Unfortunately, the Invaders showed up before Rootmars could be fully extracted, and they spent the rest of the game imprisoned at the Invaders' lair, if they weren't outright killed or eaten.
520
521Taking a certain route in Stage 5 of ''7''/''XX'' will show that the Mars People are back, and at the end of the game, just as Morden is about to be taken into custody, the Mars People swoop down and take him to safety.
522----
523* AdaptationalBadass: Both VideoGame/SNKVsCapcomSVCChaos and VideoGame/NeoGeoBattleColiseum, has the Mars People as playable characters, which means they don't die in a few hits. They have some similar moves to Metal Slug, but their supers give them new powerful moves that involve summoning ships.
524* AliensAreBastards: They just want to conquer and destroy without much backstory. They only become more likable in ''6'', where they help you against the Invaders so they will not be eaten.
525* AlienBlood: They bleed green.
526* AnimationBump: In their fighting game appearances, the Mars People are drawn much larger and in a more realistic style, which means all their tentacles get animated in many attacks.
527* AssistCharacter: One of the Martian hostages in ''6'' will provide backup with its UFO once you rescue it.
528* BrainInAJar: The Ring Laser Mecha units are operated by a brain in a jar.
529* CombatTentacles: Not really in Metal Slug, but heavily employed in their fighting game appearances.
530* ChronicBackstabbingDisorder: They betray Morden twice, for no reason other than because they can. It's not a good idea as it turns out.
531* DickDastardlyStopsToCheat: They betray Morden and the Rebels more than once, but it always backfires because the Rebels unite with the Regular Army thereafter.
532* EnemyMine: They team up with both the Rebels ''and'' the Regular Army to fight an even greater threat, the Invaders.
533* FlyingSaucer: Their main vehicle. Some of their units are unmanned ones that fire a laser. Their mothership is an even bigger one.
534* GiantSpaceFleaFromNowhere: In ''Metal Slug 2''. Not so much in ''X'', where they are foreshadowed better.
535* HoistByHisOwnPetard: Both their betrayals of Morden and the Rebel Army lead to an EnemyMine that swiftly causes their defeat. The first time because a Rebel pilot [[RammingAlwaysWorks rams their mothership with his plane]] and forces it to retreat, the second because the Rebel Army provides the player character with a rocket that allows them to reach their mothership, along with distracting the Mars People with their own attack (one of the Rebel missiles punches a hole for the player character to get into the mothership).
536* HomingProjectile: Martians primarily attack with three homing nuclei-like projectiles. Thankfully said projectiles are destructible.
537* LastEpisodeNewCharacter: They show up in the last level of ''2''. Averted in ''X'' where they appear in earlier levels.
538* OhCrap: Their standard reaction when the [[EvilerThanThou Invaders]] show up.
539* OOCIsSeriousBusiness: They are so horrified by the Invaders, since the Invaders literally eat them, they team up not only with the Rebel Army once more, but with the Regular Army as well... and ''never betray their allies this time''.
540* PromotedToPlayable: In VideoGame/SNKVsCapcomSVCChaos, Mars People is a mid-boss, but can be played in all versions of the game with a code. VideoGame/NeoGeoBattleColiseum makes one of them (called "Marpy") into a standard playable character. Also, in ''6'', [[spoiler:you can play as Rootmars for a bit in one of the routes]].
541* RayGun: Their main weapon is this, although said guns tend to fire out slow, homing, destructible nucleus-like projectiles.
542* ShoutOut: They look exactly like [[Creator/HGWells H. G. Wells']] Martians.
543* StarfishAliens: They resemble giant jellyfish/squid. Yet they have skulls, green blood, and mouths.
544** StarfishLanguage: Beep boop bop beep!
545* TheWorfEffect: After establishing themselves as the premier threats of ''2/X'' and ''3'', outshining the Morden Army, they're easily taken down, captured and imprisoned, and even ''[[FoodChainOfEvil eaten for breakfast]]'' by the Invaders in ''6''.
546[[/folder]]
547
548[[folder:Rootmars]]
549[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/metal_slug_3_two_column_01_psvita_ps3_ps4_eu_01jul15.png]]
550-->Debut: ''Metal Slug 3''
551
552The leader of the Mars People, who orchestrated the events of ''2''/''X'' and ''3''. Though originally looking like a larger Mars Person (just wearing a see-through helmet), his real form was revealed after his spaceship was destroyed (and it looked an awful lot like [[Film/ETTheExtraTerrestrial E.T.]]) He was defeated at the end of ''3'', with his brain being blown out, and sank into the ocean floor, presumably deceased.
553
554At the beginning of ''Metal Slug 6'', Morden and the Mars People are looking for Rootmars, and just as they locate him, the Invaders come in. It turns out that while Rootmars was on the ocean floor, he had apparently recovered from his freefall beating at the hands of the team, and learned a lesson as well. During Stage 4, if you take the alternate route, Rootmars will swoop down and grab your player, taking him or her to the next destination whilst also being outfitted with two gatling guns, helping take down the Invaders. Taking this route also means Rootmars saves you at the end of the game.
555----
556* BigBad: He is the main villain of ''3''.
557* BigDamnHeroes: If the player took the bottom path in Mission 4 in ''Metal Slug 6'', [[spoiler:he appears to save them from a great fall after the Invader King dies]].
558* BrainMonster: He provides the page image.
559* EldritchAbomination: He may look like E.T., but also looks like something out from [[Creator/HPLovecraft H.P. Lovecraft's]] work, and his threat level is closer to the latter.
560* EnemyMine: Rootmars is willing to cooperate with both the Rebels ''and'' the Regular Army to fight an even greater threat, the Invaders, and even becomes playable to an extent in ''6''.
561* EvilLaugh: Lets a high-pitched crackle as it grabs the player's SV-001. He also does this again when the player take the alternate lower route in mission 4 of ''6'', despite [[spoiler:being on your side]].
562* {{Foreshadowing}}: One of ''6's'' cutscenes shows the Morden-Martian alliance trying to recover ''something'' out of the sea before the Invaders attack. This is in fact Rootmars.
563* FinalBoss: Of ''3'' as well as ''Attack'''s Attack Mode campaign.
564* FreeFallFight: He is fought while you and the soldier you rescued (and another player, if any) fall down to Earth.
565* GoodScarsEvilScars: He has a number of Frankenstein-like stitches on him.
566* GreaterScopeVillain: Rootmars is the one who masterminded the alien invasion in ''2/X'' but was not seen in the game. You do fight his mothership, however.
567* LargeAndInCharge: The normal Mars People are human-sized, Rootmars takes up most of the screen you fight him on and can grab a Metal Slug (a SV-001) in one hand.
568* MeaningfulName: His name is Rootmars, he is from Mars and is the ''root cause'' of the invasion.
569* MyBrainIsBig: Bonus points for it actually being visible, encased in a dome.
570* PowerFloats: Likely owing to his psychic powers, Rootmars is always seen levatating on his own.
571* PromotedToPlayable: In ''Metal Slug 6'''s fourth stage, taking the bottom path allows the heroes to ride Rootmars and the player controls both his hand and a cannon attached to his head. Using the Bomb button causes him to use his brain wave as a SmartBomb.
572* PsychicPowers: Fitting for an alien with a giant brain, he has psychic powers.
573* StationaryBoss: When first fought in the Martians' mothership, it remains immobile in the center of the room, attached to the ship itself, while it attacks the intruders.
574* SuperIntelligence: Part of the reason he is the leader of the Mars People. He puts his abnormally big brain to good use, as he is a good schemer that knows how to employ strategies like backstabbing the Rebels properly.
575* ThroatLight: Look closely during the final boss battle. Rootmar's entire mouth glows when it dispenses exploding energy balls on you.
576[[/folder]]
577
578!!Ptolemaic Army
579
580[[folder:Ptolemaic Army]]
581[[quoteright:564:https://static.tvtropes.org/pmwiki/pub/images/img_0127_3.jpeg]]
582
583-->Debut: ''Metal Slug 5''
584
585A mysterious paramilitary group who attacked a Regular Army base and ended up stealing blueprints on Rebellion Tech, including that of Metal Slugs, which leads to them creating their own bastardized and upgraded versions. Due to the confusing nature of the game (and the fact that so much went unused), it is hard to tell who's really in charge. It appears as though they had gained the trust of the natives by the Corridor of Fire, and is using them to keep intruders away.
586----
587* CombatPragmatist: They are not as strong believers in MookChivalry as the Rebels are. You can and will die when a seemingly unarmed Ptolemaic at the top of some stairs pulls a machine gun from his pocket and ignores DenialOfDiagonalAttack.
588* EliteMooks: Their Special Forces troops can ambush the player by popping out of the background, move faster, and can throw grenades much farther than normal. Their officers (towards the end of the game when they actually fight) are also very tough and mobile, with a swarm of them serving as MS5’s equivalent of an Allen O’Neil fight.
589* GasMaskMooks: The Ptolemaic Special Forces wear black body suits with gas masks on them.
590* KnightOfCerebus: While ''Metal Slug 5'' has most of the series' usual silliness, the soldiers from the Ptolemaic Army, on the other hand, lack the silliness of their Rebel counterparts. For reference, whereas a typical Rebel will be issued with a minigun for an automatic weapon, a Ptolemaic grunt on the other hand will opt for a more practical submachine gun.
591* MiddleEasternTerrorists: Not as comically blatant as the Arabs in ''2'', but they’re named after an Ancient Egyptian dynasty, their boss theme has Middle Eastern motifs, and their standard troops have a more stereotypical modern insurgent aesthetic compared to the Rebels’ “20th century German” look.
592* MoreDakka: They carry a lot more infantry-caliber firearms than other Metal Slug factions. Machine Gun Robots in particular run on this.
593* PowerCopying: They specialize in stealing technical plans from the Regular and Rebel Army.
594* ReligionOfEvil: They are led by Ptolmaic Shamans, and apparently worship the Avatar of Evil.
595* SuspiciouslySimilarSubstitute: Of the Rebel Army. Most of the enemies are even edits of Rebel soldier sprites. They're also one to the [[VideoGame/CommandAndConquer Brotherhood of Nod]].
596[[/folder]]
597
598[[folder:Avatar of Evil]]
599-->Debut: ''Metal Slug 5''
600
601[[quoteright:341:https://static.tvtropes.org/pmwiki/pub/images/avatar_of_evil_msa.png]]
602
603A gargoyle-like entity, which no one knows what it actually is. This gigantic entity [[GiantSpaceFleaFromNowhere appears at the end of the final mission]] as the game's FinalBoss.
604----
605* AttackOfTheFiftyFootWhatever: Aside from the Mars Peoples' mothership Rugname (which is big enough to serve as an entire stage), it is easily the largest boss in the series, which is no small feat by any means.
606* AutobotsRockOut: The battle against the Avatar of Evil has a heavy metal remix of the "Final Attack" theme.
607* BackgroundBoss: Spends most of the fight in the background, and the heroes have to [[AttackItsWeakPoint shoot the glowing skull on its chest]]. Averted in ''Attack'', where it acts like most units and fights in the foreground.
608* BigBad: It is presumably the main villain for ''5'', [[GiantSpaceFleaFromNowhere but we may never know]].
609* BulletHell: Downplayed in ''5'', but its appearance as a unit in ''Attack'' plays it straight, where it fires an ''obscene'' amount of energy shots as its main form of attack.
610* CelestialBody: Its entire body seems to be made out of the fabric of space.
611* DramaticThunder: Thunder and lightning strikes when the boss makes its appearance.
612* EldritchAbomination: A gigantic demonic creature that [[CelestialBody looks like it was made from the fabric of space itself]]. It also has a skull in its chest that serves as its weak point. In ''Metal Slug Attack'', even the scythe it wields gets in on it and appears to be organic - and the aforementioned skull appears to be protruding out of its chest, breathing on its own.
613* EmotionEater: According to Mira, the Avatar of Evil grows stronger by feeding on human emotions.
614* EvilIsBigger: Barring Rugname, the Mars People's mothership, this thing is by far the largest boss in the franchise.
615* FinalBoss: With ''5'' allegedly being the last in chronology, the Avatar of Evil serves as this for the series’ plot, as well as the last boss for ''5'' in general.
616* FlamingSkulls: The skull in its chest seems to be burning with an ethereal or cosmic substance.
617* GenericDoomsdayVillain: Even by the standards of this series.
618* GiantSpaceFleaFromNowhere: There is no explanation if this entity was allied with the Ptolemaic Army, or if it was their leader, or if they were in a ReligionOfEvil and it's their GodOfEvil they were summoning to bring about TheEndOfTheWorldAsWeKnowIt. ''Attack'' seems to be pointing to the latter, as Ptolemaios summons it for his special attack, and later cements it by having the Avatar of Evil be the "Ultimate Boss" of the Ptolemaic Army. Prior to its inclusion as a unit, this entity ''didn't even have a name''.
619* HellIsThatNoise: Produces a loud screech when it shows up to attack the heroes in ''5'', as well as when it's finally defeated.
620* KnightOfCerebus: Whatever this thing is, its design is very much DarkerAndEdgier compared the usual bosses that appear in the series and is actually '''very menacing'''.
621* LeanAndMean: The silhouette shows that it is a very thin being.
622* MadeOfEvil: It is even in its name.
623* NonStandardCharacterDesign: Whereas everyone else is a human, an alien or a robot, this thing is a towering entity that’s made of space itself.
624* PlayingWithFire: Most of its attacks will burn you to death should they hit.
625* RedEyesTakeWarning: It has a piercing gaze with red eyes.
626* ScrewThisImOuttaHere: When defeated, it flies back into its home dimension, preventing us from knowing what this behemoth is.
627* SequentialBoss: After fighting a MiniBoss, the DualBoss Mammoth Towers, the player gets sent to the top of a tower where the entity awaits, with little room to breathe in between.
628* SinisterScythe: Which appears to be forged out of flames, or made of [[LivingWeapon flesh]] in ''Attack''.
629* SinisterSilhouettes: In ''5'', it is pitch black for the majority of its screentime, only shown off by the thunder strikes.
630* WingedHumanoid: It has large, bat-like wings.
631[[/folder]]
632
633[[folder:Ptolemaios]]
634[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/story_act_031.png]]
635-->Debut: ''Metal Slug Attack''
636
637Originally meant to be the FinalBoss of ''Metal Slug 5'', Ptolemaios makes his true debut in ''Metal Slug Attack'' as the main villain for the "Ptolemaic Attack" event. He is the leader of the Ptolemaic Army, controlling his troops within the shadows. He uses Sol De Rokker's red jewel to create a tower for himself that attacks with lightning and rosetta stones.
638
639A side story revolves him annihilating the Red Goblin society, with Red Goblin seeking revenge.
640----
641* BadFuture: Ptolemaios is implied to be the winner in a future timeline. This results in two other characters going back in time where Ptolemaios has lower amounts of power.
642* BigBad: Informally in ''5''. In ''Attack'', he is this to Red Goblin.
643* TheCameo: Mostly unintentional, but his towers (as well as the Stone Turtle and the Elephants) can be seen in the background of Mission 5.
644* CameBackStrong: Every death he suffers results in him getting new attacks.
645* DeathFromAbove: Drops Rosetta stones on top of the opposing team.
646* {{Expy}}: His younger self from ''VideoGame/MetalSlugAttack'' is a LongHairedPrettyBoy with WhiteHairBlackHeart in the same vein as Sephiroth of ''VideoGame/FinalFantasyVII''.
647* HijackingCthulhu: His Abyssal form's special attack is summoning the Evil Spirit Incarnate, also known as the Avatar of Evil.
648* IWasQuiteALooker: [[spoiler:He returns to being a beautiful young man in the Extra Ops [=If/The Beginning=].]]
649* LukeIAmYourFather: [[spoiler:"Diaphtora Genesis" reveals that Mira is his daughter.]]
650* ShadowDictator: How his description in ''Attack'' [[{{Handwave}} handwaves]] his lack of appearance in ''5''.
651* ShockAndAwe: The bottom of his tower produces lightning strikes.
652* TheUnfought: Was intended to have a boss fight near the end of the game, but it was DummiedOut. As a result, right before the final battle, a tower can be seen blowing up by itself, presumably being his personal weapon.
653* WhatHappenedToTheMouse: Due to ''5'''s rushed state, he is not truly encountered.
654[[/folder]]
655
656!!Invaders
657
658[[folder:Invaders]]
659-->Debut: ''Metal Slug 6''
660
661The Mars People's nemesis, they not only appear to be physically stronger and more diverse than the Mars People, they also seem to have better technology on their side as well. They form the second half of ''Metal Slug 6'''s plot, especially after their first appearance was snatching up two Martians and eating them.
662
663Their king comes to Earth via an asteroid, and they are quick to set up an underground shelter for him. After one hell of a fight against the team, the king falls to his death, releasing an explosion that apparently kills the protagonists as well. Depending on which route you took in Stage 4, either Morden or Rootmars will save the player.
664----
665* AlienBlood: They bleed purple, in contrast to the Mars Peoples' green.
666* AliensAreBastards: Even moreso than the Mars People.
667* AlwaysABiggerFish: Right when both Morden and the Mars People have you captured, these guys then come in and make very short work of them. It even extends to the flashback where they make very short work of both the Rebel troops and Mars People.
668* BreathWeapon: The Winged versions can spit globs and globs of acid at the players.
669* TheDreaded: The Mars People cower in fear when these guys appear. [[FoodChainOfEvil And rightfully so]], since Invaders will eat the Mars People and wipe the floor with them in all encounters.
670* EliteMooks: Red Invaders are faster, stronger, and can soak up a lot more damage than regular ones, but they appear fewer in numbers.
671* EvilIsVisceral: They have an organic lair as opposed to the Mars Peoples' technological one.
672* FoodChainOfEvil: The Invaders hunt the Mars People as food and serves as an arch-nemesis for them.
673* GiantEnemyCrab: The Crab-tanks and Vanguards.
674* KnightOfCerebus: The Mars People have an OhCrap reaction when they show up and eat them at the end of Mission 2. The final mission also has a DarkReprise of the classic "Final Attack" theme.
675* HeliCritter: The Smashers, which spin their legs to fly in the air like a helicopter before inflating themselves to crash down on you.
676* HordeOfAlienLocusts: Literal in this case, as most of them are insectoid in nature, and they come in droves.
677* HorrifyingTheHorror: The Mars People who were the dangerous main antagonists of ''2/X'' and ''3'' are deathly afraid of them, cowering at first sight of the basic Invader drones.
678* PuppeteerParasite: One of the Invader units is a small flying parasite-like bug that latches onto the heads of rebel troops and mind-controls them. In the final stage, a unique variant appears to have mind-controlled one of the non-selected player characters into fighting against the players.
679* RollingAttack: The Invaders' basic attack most of the time.
680* SpinAttack: The Drones move around via spindashing.
681* ToServeMan: Invader Drones don't just eat Martians. Some of them can throw their neck forwards and will eat the player character whole if it connects.
682* UniqueEnemy: There is a golden Hunter Walker encountered if you take a secret path in the final mission, killing it grants 50000 points.
683* ZergRush: The standard troops ambush in groups. In Mission 3, a large horde of them come spinning down from the right side.
684[[/folder]]
685
686[[folder:Invader King]]
687[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/invader_queen.png]]
688-->Debut: ''Metal Slug 6''
689
690A huge alien that serves as the final boss of 6, and the leader of the Invaders.
691----
692* BackgroundBoss: Most of the boss is in the background. The heroes need to attack his head to damage him.
693* BigBad: The leader of the Invaders in ''6''.
694* BulletHell: It spams two different waves of projectiles at you. One of them has a random pattern even.
695* DisneyVillainDeath: Falls to his death before blowing up in a massive explosion.
696* EyeBeams: Purple ones that aim at you.
697* FinalBoss: Of ''6''.
698* FlechetteStorm: Has an attack where he charges energy then releases it in crescent projectiles. Then they fly at the player from the left and right, or may even converge on them from all directions.
699* HoldTheLine: The final part of the battle turns into a FreeFallFight where he is invulnerable, sending ''huge waves'' of destructible projectiles downwards at you.
700* KaizoTrap: Upon being defeated, the Invader King will spam its attacks all over the screen while trying to drag the player with itself while falling to its death. The projectiles are destructible, but can also destroy you if they connect.
701* LargeAndInCharge: He is one of the biggest Invaders there.
702* SamusIsAGirl: Inverted. The stereotypes regarding alien hives led to him being misinterpreted as the Invader Queen in the past, but it's the Invader ''King''.
703* SequentialBoss: The player has to fight his/her kidnapped teammate first. Immediately after that is a climb up to the shaft leading to the Invader King, with no enemies left in between. In the fight against the King itself, it starts as a cocoon-like state before waking up and breaking out of the shell to become a proper boss. And then the King smashes the floor several times during the fight, before he is near-death and falling in a chasm with you. Then he tries to take you with him.
704* SpoilerCover: The [=PS2=] covers blatantly show the Invader King. Using its sprite, this makes the King into an EvilOverlooker in the process.
705* TrickBoss: The heroes face off the pod where he is encased in. It stays there, doesn't do anything, and is periodically accompanied by the Invader Drones. When beaten, a bunch of Morden soldiers come in to celebrate with a victory music of sorts and suddenly, his eyes flash and destroy the soldiers.
706[[/folder]]
707
708!!Others
709[[folder:Amadeus Syndicate]]
710[[quoteright:332:https://static.tvtropes.org/pmwiki/pub/images/story_act_041.png]]
711 [[caption-width-right:332:The leader of the syndicate himself, the Doctor.]]
712-->Debut: ''Metal Slug 4''
713
714A mysterious organization whose main threat to the world is the release of the "White Baby Virus", a supervirus powerful enough to penetrate any mainframe's defenses. It also appears as though Morden is supporting their efforts, though they had made a robotics plant at their base, creating several Morden bots, possibly including the one seen in the opening sequence.
715
716The main man himself supposedly died at the end of the game when his base was destroyed, making him the first antagonist in the series to die for good. However, the credits sequence showed an intact computer broadcasting something...
717----
718* TheCracker: The Amadeus Syndicate are a team of cyber-terrorists.
719* EliteMooks: The disguised Amadeus troops use Heavy Machine Guns in the final level.
720* EveryoneCallsHimBarkeep: The leader is referred as "Doctor" in ''Metal Slug Attack''.
721* EvilOldFolks: The Doctor himself.
722* FramingTheGuiltyParty: Their soldiers dress up as Morden's troops, and they have robot Mordens and Allens, presumably to invoke this trope. In the last level, they instead dress up as Regular Army troops.
723* MechaMooks: Employ a lot of these.
724* PaletteSwap: In ''Attack'', the Infantry are purple colored Rebel Soldiers.
725* RobotMe: Robot Mordens and Allen O'Neils.
726* SyntheticPlague: They managed to harness the Mummy and Zombie viruses from the previous games.
727* VillainTeamUp: With the Rebel Army in ''Attack''. When Allen and Abigail were being ambushed by the robots, they assumed the Syndicate betrayed them. They were not; it was [[spoiler:the Syndicate's supervirus doing all the dirty work for her own.]]
728[[/folder]]
729
730[[folder:Kewald Oguma]]
731[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/250px_oguma_2.png]]
732-->Debut: ''Metal Slug 3D''
733
734Pronounced [[ItispronouncedTroPay Ogma]], he is the head of the ridiculously massive company named after himself, Oguma is apparently funding Morden's efforts, but is actually using him to help find a recording device deep underground, the Alator. It turns out that Oguma was one of few survivors of a long-extinct race, the Tuaha de Dunan, who are shown to be technically advanced.
735
736His culture was said to self-destruct at the peak of their evolution; to combat this, they placed a recording device on a planet, then hibernated for 300 million years. If the information gathered by the device clashes with them in any way, they simply erase the world's history and start over, which has possibly caused some time-space problems.
737
738Near the end of the game, after betraying Morden, he uses the Alator to release the Lugas, which then absorbs the information from Alator and begins its mission to erase history, prompting the crew to stop it. When Lugas is absorbed by a previous experiment, the Lieu (and beaten by the crew afterwards), it goes crazy as Oguma and his followers stay behind in an attempt to further stop it, despite Marco's protests.
739
740At the game's end, as Rumi is about to head out, Oguma shows up out of nowhere and hands her his information disc before leaving, hoping the people would learn from his prior mistakes.
741----
742* AbusivePrecursors: Oguma and his people essentially began life on Earth, but they have no problem snuffing it out in pursuit of their goals and starting it all over again (with the very real possibility of them doing it again).
743* AffablyEvil: Speaks in a very polite and calm voice. When beaten, he [[GracefulLoser admits his people's time has come]] and gives his data to Rumi, since humanity won out.
744* ChuckCunninghamSyndrome: He is not present in ''VideoGame/MetalSlugAttack'' nor its predecessor.
745* ShoutOut: The Tuaha de Dunan are named for the pantheon of Myth/CelticMythology. Lugus, their secret weapon, is named after a major god.
746* SNKBoss: His previous experiment, Lieu, is this. They fire projectiles at the player ''very precisely'', and will destroy a Metal Slug immediately when the player rides on it.
747* TheStarscream: Betrays Morden halfway through the game after showing his true colors, and eventually becomes the game's BigBad.
748[[/folder]]
749
750[[folder:Pharaoh's Arc and the Mummy Army]]
751[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/story_act_013.png]]
752 [[caption-width-right:350:The ruler of the Mummy Army himself, the Pharaoh .]]
753-->Debut: ''Metal Slug Attack''
754
755An expansion of the mummy enemies, the Pharaoh, Mummy Warrior, and Mummy Cat make their first appearance in the "Mummy" event.
756
757!!Tropes for all three characters:
758* ActuallyFourMooks: Subverted. While the Pharaoh's Arc consists of multiple mummies on a chariot, they are all part of the same unit.
759* DistractedByTheSexy: The Mummy Cats' main way of luring their enemies.
760* DubNameChange: The Mummy Cats are called Sexy Mummies in Japan.
761* EnemySummoner: The Mummy Cat's attack is to summon mummies that spit out poison bombs. If her third skill is unlocked, enemies hit by them have a chance to be stunned.
762* KillItWithFire: The Mummy Warrior uses a long torch as his weapon.
763* PaletteSwap: The Lovely Mummy is a red colored version of the Mummy Cat.
764* SupportPartyMember: The Mummy Cat is awkward to use, but three of her four skills involve increasing the strength of Mummies, Mummy Warriors, and Mummy Dogs.
765* VillainousBreakdown: The Pharaoh turns green in rage alongside his minions after being defeated. As the Tyrant Pharaoh, he starts commanding in a furious manner.
766* TheVirus: Their poisonous breath can turn other people into mummies, bandages and all.
767[[/folder]]
768
769!Support Characters and other notable NPC's
770
771[[folder:Rumi and Madoka Aikawa]]
772[[quoteright:279:https://static.tvtropes.org/pmwiki/pub/images/msd___rumi_aikawa.png]]
773[[quoteright:279:[[labelnote:Click here to see Madoka]]https://static.tvtropes.org/pmwiki/pub/images/msd___madoka_aikawa.png]][[/labelnote]]
774
775Rumi originally joined the Regular Army to make use of their medicinal facilities to help her ailing mother, who had a weak heart, and her sister Madoka, who was physically ill. Due to a paperwork SNAFU, she was shipped to the front lines, and despite having never completed her training, she made it back unscathed, a miracle in and of itself.
776
777She was offered the chance to leave and live life as a civilian, but she declined the offer, and was soon transferred to the Supply Division. Before each mission, she fills her backpack with various supplies, and treks out to deliver the goods to Regular Army Soldiers... but there's one problem. She's horrible with directions, and is likely to wander off and be found in a completely different location, earning her the nickname "The Wandering Ghost" by most soldiers. She later found out her sister Madoka also joined to become more physically fit, and was also placed in the Supply Division... and shares the same atrocious sense of direction her sister has.
778
779Though mostly a background character in the main games, Rumi was given a bigger role in ''Metal Slug 3D'', giving information to Marco and even allowing access to a Garage where the player could customize their own Metal Slug vehicle.
780----
781* ActionGirl:
782** Promotional art for ''Metal Slug Defense'' shows Madoka parachuting while operating a bazooka. She is not a unit in ''Defense'' but she is in ''Attack'', using her bazooka from her backpack and throwing a medicine item to heal units.
783** Rumi [[PromotedToPlayable turns into one]] in ''Metal Slug Attack''. She throws grenades from her backpack to her foes and tosses support items to her allies. Madoka gets added later, packing a Bazooka with great range and a humongous rate of fire and healing the front line.
784* BewareTheNiceOnes: These two have some obscenely powerful Normal attacks in ''Attack''.
785* ButtMonkey: A minor one, tagging either one of the sisters will cause them to fall to the floor and shooting them from the back tears their backpack open, dropping various items. The former also occurs when the player taps on Rumi on both tower defense games.
786* CombatMedic: Madoka's special in ''Attack'' heals friendly troops.
787* CuteClumsyGirl: Given the above. It's taken even further in ''3D'' when Rumi tries a dynamic entrance from a helicopter and screws it up.
788* FanservicePack: Apparently, they've been starting to unbutton their shirts since ''Defense'', even though their sprites in ''Attack'' show them with their shirts buttoned all the way up.
789* FingerpokeOfDoom: Rumi flails her hands like an angry toddler as her ''MSA'' melee attack. It does a lot of damage.
790* InSeriesNickname: "The Wandering Ghost"
791* ItRunsInTheFamily: Both sisters being terrible with directions.
792* TheMedic: Rumi is seen in the bad ending of ''Metal Slug 4'' taking care of the characters who got caught in the final mission's explosion. The Recovery Support in ''Metal Slug Attack'' represents her in a nurse outfit. She later turns into a CombatMedic in the 2.3.0 update. In the 2.5.0 update, Madoka is literally this, as her special attack heals the players units on the map.
793* MotorMouth: In ''3D'', Rumi is very talkative, impudent, and prone to going on tangents. She even sasses Marco after he gives her direct orders (she's a corporal; he ''far'' outranks her at Major), but she falls in line when he gets more direct.
794* {{Mukokuseki}}: Let's be honest, they look even less Japanese than Eri.
795* NoSenseOfDirection: Though they count as P.O.W.s, they are never caught by the enemy. They just happened to wander through the area.
796* OlderThanTheyLook: Despite being a PaletteSwap, Madoka is eleven years older than Rumi.
797* OutOfFocus: Rumi has had more game appearances and cameos than Madoka. In both tower defense games, Rumi is the one who generates AP in the field and gets playable status in ''Attack''. In ''Attack'' only, Madoka appears in the item support menu, but now appears as a playable unit alongside her sister in the 2.5.0 update.
798* PaletteSwap: Madoka has brown hair and grey attire compared to Rumi's blonde hair and green attire.
799* PintSizedPowerhouse: Both walk and carry an overly large backpack holding various ammunition and food items. Downplayed as they seem to be struggling to keep balance.
800* SeriesContinuityError: ''Metal Slug 3D'' has Rumi ranked as a Corporal even though she's a Sergeant in every game she appears in.
801* TimedMission: If they are on screen long enough without being tagged, they will stop to salute and run away, not giving any credit to the player for rescuing them.
802* UnusuallyUninterestingSight: Both sisters tend to wander the active battlefield without any care for what's going on around them. It is not until they see one of the protagonists where they bail out of there.
803* YouDontLookLikeYou: Rumi first debuted in the console version of the first game, though here, she is portrayed as a long-haired brunette (except for her in-game sprite) rather than a blonde with a long ponytail. Her in-game sprite is radically different as she had a SuperDeformed look rather than her familiar, realistically proportioned sprite from ''2'' and onwards.
804[[/folder]]
805
806[[folder:Hyakutaro Ichimonji]]
807[[quoteright:228:https://static.tvtropes.org/pmwiki/pub/images/d4402fecff50a7305e907736da4e5569973b9abc_00.jpg]]
808
809A Second Lieutenant of the Regular Army, he's a living legend among the soldiers. Pretending to be a captured POW, once he's "rescued" by the player, he helps out by firing homing Hadokens at the enemies and spin-kicking anyone else who gets too close. He will flee if you die, though.
810----
811* GuideDangIt: Sometimes appears when the player hits a specific invisible spot multiple times.
812* KamehameHadouken: His main attack has him fire a ''homing'' hadouken at enemies. It also deals pretty good damage too.
813* ObfuscatingStupidity: He pretends to be a captured POW ''on purpose''. Once he's "rescued", however...
814* ScrewThisImOuttaHere: Runs away once his rescuer dies.
815* ShoutOut: [[Series/KamenRider His first name starts with the letter H, and his last name is Ichimonji]], but he's no Hayato. Doesn't stop him from kicking ass though.
816[[/folder]]
817
818[[folder:Pupipi]]
819
820A Martian who is one of the captives inside an Invader hideout, Pupipi will assist the players once freed from stasis imprisonment.
821----
822* AmbiguousGender: Pupipi's gender is unknown.
823* EnergyWeapon: Pupipi's mini-UFO is armed with a laser shot and will shoot at enemies whenever a player fires their weapons or throws a grenade.
824* GuestStarPartyMember: Unlike Hyakutaro and Utan who will stay by the player's side permanently until they either die or transition to a new area, Pupipi will eventually leave the area should Pupipi fire about 20 laser shots.
825* OneShotCharacter: Only appears in ''6'', and is completely absent from ''Attack''.
826[[/folder]]
827
828[[folder:Utan]]
829[[quoteright:342:https://static.tvtropes.org/pmwiki/pub/images/cpr_zhww8aayag3.png]]
830
831An ape that wears a diaper and carries an Uzi.
832----
833* AttentionDeficitOohShiny: He's [[JustifiedTrope an animal]], so don't expect him to be as focused on the mission as you are.
834* GagPenis: If you look at his IdleAnimation close enough, you'll notice he pulls out 3 bananas out of his diaper and eats them, after which he tries it again but pulls out his [[IncrediblyLamePun monkey dong]] instead, blushes and quickly stuffs it back inside.
835* TheLoad: As noted above, he is not as combat focused as Hyakutaro as it takes a while for him to actually pull a trigger. While a single bullet is enough to off a Rebel soldier, he is next to useless against durable common enemies (such as Zombies, and Chowmein-Conga), and even against the former, don't rely on him too much when he is fighting alongside you.
836* ALizardNamedLiz: An ape named "Utan".
837* StockAnimalDiet: Being a subspecies of monkeys, his favorite food is bananas.
838[[/folder]]
839
840! Combat School Instructors
841
842[[folder:Sophia Greenville]]
843[[quoteright:216:https://static.tvtropes.org/pmwiki/pub/images/msd___sophia_greenville.png]]
844
845The drill instructor from ''Metal Slug 1'' (Neo Geo CD and PSX).
846----
847* AscendedExtra: While every instructor in the series shows up in ''Metal Slug Defense'', Sophia is the only one that hosts the Combat School in ''Attack'' (along with new sprites for her).
848* BabiesEverAfter: Margaret, the instructor from Metal Slug X hints that Sophia retires to raise a family.
849* TheBusCameBack: Shows up with Margaret in the second and third Pachislot games in Japan. In the West, it is in ''Metal Slug Defense''.
850* DoItYourselfThemeTune: Sings the vocal version of the first game's alternate ending theme, [[https://www.youtube.com/watch?v=jgIgUkkBZPk "Hold You Still"]].
851* MsFanservice: There's a good amount of art dedicated to her in the art galleries of the home versions.
852* PassionateSportsGirl: What made her easily excel as a member of the Peregrine Falcons. Her favorite sport is Basketball, and also dabbles in bass fishing.
853[[/folder]]
854
855[[folder:Margaret Southwood]]
856[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/msd___margaret_southwood.png]]
857
858The drill instructor of ''Metal Slug X'' and Gimlet's mission control in ''Metal Slug: Second Mission''.
859----
860* AscendedExtra: Unlike other instructors, she has given larger roles in certain games. In ''Second Mission'', she appears as mission control in the main adventure and even shows up in certain missions as the end goal. In ''Defense'', she hosts the game's events.
861* ArtShift: ''Metal Slug Defense'' uses her sprites in ''X'' for the Events and her new artwork for the Combat School.
862* DrillSergeantNasty: A jerk to you on the lower ranks, although she'll soften up as you rise among the ladder.
863* EarlyInstallmentCharacterDesignDifference: Wore a green military dress in ''X'' before changing to a blue dress for ''Second Mission'' onward.
864* EasterEgg: [[spoiler:Touching her breasts]] in ''Metal Slug Defense'' will cause her to react depending what rank you are in.
865* EyesAlwaysShut: [[OOCIsSeriousBusiness If she opens them]], you've either impressed her, or you've made a complete ass of yourself.
866* HairColorDissonance: It's uncertain if her hair is blonde or light-ish brown but sometimes her hair is represented by a darker shade of brown.
867* LikeAGodToMe: Hitting the Super Devil rank will make her admire you to the point of calling you "Your Majesty".
868[[/folder]]
869
870[[folder:Riviera "Lilly" von Wittenberg]]
871[[quoteright:246:https://static.tvtropes.org/pmwiki/pub/images/msd___lilly_von_wittenberg.png]]
872
873One of the two drill instructors in ''Metal Slug 6''.
874----
875* DrillSergeantNasty: Even moreso than the other instructors.
876* FanservicePack: Shows more cleavage in ''Defense''.
877* HairTriggerTemper: Most of the time looks calm until something provokes her.
878* QuitYourWhining: Hates whiners and is often cold with them.
879[[/folder]]
880
881[[folder:Maryell "Mary" von Wittenberg]]
882[[quoteright:160:https://static.tvtropes.org/pmwiki/pub/images/msd___mary_von_wittenberg.png]]
883
884One of the two drill instructors in ''Metal Slug 6''.
885----
886* DrillSergeantNasty: Averted, she's much nicer and less stern than the other instructors.
887* TheKlutz: Seen dropping her documents.
888[[/folder]]
889
890!Bosses
891
892[[folder:In general]]
893* EvilIsBigger: Pretty much all of them dwarf the size of you and your Slug combined, the only exception being the Rebel Gigant (who's the same size as your Slug).
894* VehicularAssault: Most of the bosses are a huge vehicle or robot of sorts that the player has to fight on foot or in a Slug.
895[[/folder]]
896
897!!''Metal Slug''
898[[folder:Tetsuyuki]]
899[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/tetsuyuki.png]]
900
901The first boss of the game and series, the Tetsuyuki is a flying warship created by the Rebels for combat, equipped with heavy armor and weapons. One of these crash-landed onto the Villeneuve Mt. System, where it was fortified by the Rebels to serve as a base of operations. Some of its weapons are still operational.
902----
903* BossArenaIdiocy: Its WaveMotionGun attack would be much more accurate if there weren't any platforms for the target to stand on.
904* CoolPlane: Albeit one that doesn't fly.
905* StationaryBoss: Doesn't move from its spot, due to having crash-landed and made into a stationary base of operations.
906* WarmUpBoss: All of its attacks are relatively easy to avoid and it's the first boss of the series.
907* WaveMotionGun: It can charge up with one of these and fire. Either crouch or stay on higher ground to avoid it.
908* WorfHadTheFlu: According to the lore, it's actually a very powerful ship, which is dreaded by the enemies of the Rebels. However, the one you face in the first game has crashed, cannot move at all, let alone fly anymore, and it's only a threat because ''some'' of the weapons are still operational.
909[[/folder]]
910
911[[folder:Hairbuster Riberts]]
912[[quoteright:181:https://static.tvtropes.org/pmwiki/pub/images/hairbuster_riberts.png]]
913
914A prototype Rebel Army heavy bomber aircraft.
915----
916* BossArenaIdiocy: Of all the places it could fight you in, there just had to be three rising platforms that gave you ample cover from most of its attacks.
917* CoolPlane: Unlike the Tetsuyuki, this one does fly.
918* RecurringBoss: It also appears in ''Metal Slug 3'' as one of the minibosses in the final level. Allen pilots it this time.
919* TraintopBattle: Its encounter in ''Metal Slug 1'' has you battle it on a moving train.
920* VillainExitStageLeft: In ''Metal Slug 1'', Morden's in the aircraft. When destroyed, he drops out of it, but a Rebel in a Flying Tara rescues him and exits the area.
921[[/folder]]
922
923[[folder:Tani Oh]]
924[[quoteright:257:https://static.tvtropes.org/pmwiki/pub/images/tani_oh.png]]
925
926A giant self-propelled artillery tank armed with a twin-barrel rail cannon and a pair of Gatling guns/mine launchers.
927----
928* GatlingGood: Besides its mine launchers, this boss also comes equipped with two Gatling guns on its sides.
929* LandMineGoesClick: Its side launchers can fire landmines.
930* MeaningfulName: Tani Oh means "Valley King" in Japanese. Appropriately enough, you encounter it at the top of a valley.
931* SamusIsAGirl: Not the tank itself, but its pilot. In the ''Metal Slug'' pachinko game, it is revealed that its pilot is a blonde woman named Letta.
932* TankGoodness: A huge Rebel army tank with a laser cannon/railgun type weapon and mine launchers.
933* WaveMotionGun: The main cannons fire some sort of laser or railgun type weapon that hits anything in its range instantly.
934[[/folder]]
935
936[[folder:Shoe & Karn]]
937[[quoteright:284:https://static.tvtropes.org/pmwiki/pub/images/shoe_and_karn.png]]
938
939A pair of medium tanks created by Rebel Army for cooperative missions. They are each armed with one main turret-mounted cannon, two sub-cannon turrets on the front, and a missile launcher on the back. Two side-mounted hatches allow soldiers to help defend the tank as well, if their target is at the rear.
940----
941* DegradedBoss: After fighting them as a boss, the following level has you fight a miniboss version of Shoe as it advances towards you from behind. You also have to fight Shoe as a miniboss in Mission 5 of ''X''.
942* DevelopersForesight: Normally, a rebel soldier at the hatch will pop out to carry out an order to attack -- pointing forward for the frontal guns, and pointing upward for the missiles. If the soldier in question is killed, the tank operators' attack pattern will become harder to predict.
943* DualBoss: You fight both of them at the same time.
944* MiniBoss: Shoe is encountered as one in Mission 5 of both the original game and ''X''.
945* TankGoodness: Two large Rebel army heavy tanks with a main turret and frontal cannons, and missile launchers.
946[[/folder]]
947
948[[folder:Iron Nokana]]
949[[quoteright:178:https://static.tvtropes.org/pmwiki/pub/images/iron_nokana.png]]
950
951A large multi-role armored combat vehicle created by the Rebel Army.
952----
953* FireBreathingWeapon: Carries a hidden flamethrower on its bottom.
954* MacrossMissileMassacre: It carries a multi-missile turret on top.
955* RecurringBoss: Appears as the first boss of ''Metal Slug X''. It's ''dramatically'' easier this time around.
956* TankGoodness: Carries a Girida-O tank on its back to serve as its rear firepower.
957* WeaponizedCar: It is a weaponized armored truck.
958[[/folder]]
959
960[[folder:Hi-Do]]
961[[quoteright:112:https://static.tvtropes.org/pmwiki/pub/images/hi_do.png]]
962
963The Hi-Do is a gunship helicopter used by Donald Morden himself. Designed for testing purposes, it has heavy armor and is equipped with several weapons, making it a versatile combat vessel.
964----
965* {{AKA47}}: It's basically a shrunk-down CH-47 Chinook.
966* DegradedBoss: It reappears as one of the many {{Mini Boss}}es of the final mission of ''3'', literally just as the Mars People make themselves known again (a Martian masquerading as Morden during the fight itself). It is fought in almost the exact same way, except the player has access to a mounted machine gun to make it even easier.
967* DestructibleProjectiles: Both its bombs and missiles can be destroyed. A ''very'' good thing too, since it would be nearly impossible to avoid some of its attacks otherwise.
968* DeathFromAbove: It's capable of using a carpet bombing attack where it drops bombs all over the area.
969* FinalBoss: The last battle of ''Metal Slug 1'', where Donald Morden himself pilots this.
970* HomingProjectile: Its missile attack will home in on the player.
971* MacrossMissileMassacre: Has a missile launcher on its front that shoots a swarm of homing missiles.
972[[/folder]]
973
974!!''Metal Slug 2/X''
975
976[[folder:Mosque Artillery]]
977
978[[quoteright:270:https://static.tvtropes.org/pmwiki/pub/images/missiletower.png]]
979
980In the first mission of ''2/X'', after fighting through the first wave of enemies (Arabian soldiers or Morden's rebels, depending which game) the players will then reach a mosque which has been converted into a bunch of missile-spewing towers that serves as a mid-level boss.
981----
982* MacrossMissileMassacre: The towers are built with turrets that fires multiple (slow-moving) missiles on you.
983* WarmupBoss: Befitting it's nature as the ''first'' boss of the ''first'' level. The missiles are slow, the turrets have pathetic health, and right before the battle you're likely armed with a Heavy Machine Gun (''X'' gives you an Enemy Chaser instead, though it's not advisable to pick that up immediately -- save it until your HMG is out) allowing you to destroy one or two of those turrets easily. A rookie player should be able to destroy all three while suffering between minimal to zero lives lost.
984* WeaponizedLandmark: In a way, since the level is set in the Middle East, and that it's a mosque which is being converted into a boss.
985[[/folder]]
986
987[[folder:The Keesi]]
988[[quoteright:272:https://static.tvtropes.org/pmwiki/pub/images/the_keesi.png]]
989
990The Keesi is a VTOL gunship meant to provide close air support to ground troops. It is equipped with anti-air guns on its wings and can drop heavy bombs (these weapons are not used in-game), and its size is enough to carry support tanks on its wings. The Keesi is also capable of using its jet engines to burn anything underneath it.
991----
992* DemotedToExtra: In ''Metal Slug X'', it is replaced by the Iron Nokana as the first boss, and is instead relegated to the miniboss of the third mission.
993* CarFu: In ''Metal Slug X'', it drops tanks on you as an attack.
994* CoolPlane: A large gunship with anti-air guns and can carry troops.
995* ClownCarBase: In ''Metal Slug X'', it can carry an unlimited number of tanks on its wings, and replenishes them after it drops them.
996* FlunkyBoss: In ''2'', it will spawn Arab soldiers to attack you. Subverted by the bazooka soldiers that assist it once its health gets low, they cannot be damaged in any way.
997* RecurringBoss: It appears as a miniboss in ''Metal Slug X''.
998* TankGoodness: It is capable of carrying tanks on its wings, and they do attack with their cannons.
999* WarmupBoss: You're safe from the Keesi's WeaponizedExhaust as long as you're standing beneath its underbelly; the two bazooka mooks standing on it's wings are a bigger threat than the Keesi itself. Ironically, it's actually ''harder'' as a mid-boss in ''X''.
1000* WeaponizedExhaust: One of its more dangerous attacks is to fire hot exhaust from its jet engines, then sweep the area by moving left and right.
1001[[/folder]]
1002
1003[[folder:Aeshi Nero]]
1004[[quoteright:266:https://static.tvtropes.org/pmwiki/pub/images/aeshi_nero.png]]
1005
1006A gigantic excavating machine resembling a cobra, created by the Rebel Army. Although it is primarily designed for digging tunnels, it can be re-purposed for combat in a pinch.
1007----
1008* AdvancingBossOfDoom: You will need to keep climbing upwards as the Aeshi Nero devours the tower you're standing on. If you're unfortunate enough to lose the Slugnoid you can obtain right before the Aeshi Nero appears, you're in for an excruciatingly tedious battle (you can only shoot downward while jumping, so get jumping).
1009* AstonishinglyAppropriateAppearance: It is an excavating machine that happens to resemble a cobra and also happens to be fought in an ancient Egyptian pyramid. Cobras were one of the animals worshiped by the ancient Egyptians.
1010* MechanicalMonster: A giant excavator resembling a cobra that tries to "swallow" the pillar you're on.
1011* MacrossMissileMassacre: Can fire out a slew of homing missiles.
1012* PlatformBattle: The player has to jump from platform to platform as it chases them up the large pillar.
1013* ReptilesAreAbhorrent: A giant cobra excavator mech that's hell-bent on "eating" the player characters.
1014* RiseToTheChallenge: It'll charge upwards now and then, and as such the player needs to move upwards as well to avoid electrical death.
1015* SpellMyNameWithAnS: Is it "Aeshi Nero"? Or is it "Assy Nero"?
1016* WaveMotionGun: It is equipped with a laser cannon in its mouth. While it is originally used for tunneling through hard layers of rock, it can be also used for combat.
1017[[/folder]]
1018
1019[[folder:Dragon Nosuke]]
1020[[quoteright:174:https://static.tvtropes.org/pmwiki/pub/images/dragon_nosuke.png]]
1021
1022A large quadruped tank designed to protect the Rebel Supply Train with its Gatling gun and flamethrower. The tank is also equipped with hydraulics within its legs, allowing it to crouch - crushing anyone or anything that happens to be beneath it.
1023----
1024* ColossusClimb: If you're fighting the Dragon Nosuke on foot, you can avoid its flamethrowers and Gatling gun by jumping on its shoulders as soon as it sits down, and attack it from up close. Be warned, however, the Nosuke will retaliate by releasing homing fireballs from its shoulder hatch, and players will need to quickly jump off or risk getting incinerated.
1025* FireBreathingWeapon: Its underside carries a flamethrower.
1026* FlunkyBoss: The tank is capable of spawning helicopter firebombs that home in on you and can be destroyed.
1027* GatlingGood: Comes equipped with a Gatling gun that can fire either small or large bullets.
1028* GroundPound: If the player tries to be sneaky by hiding under its legs to avoid its gunfire, it will "sit down" on the platform and crush them instead.
1029* JumpScare: Non-horror variant. A Dragon Nosuke will normally vent its exhaust port before crouching if you are below it. However, in a rare instance, it will immediately crouch without warning which can serve as a nasty surprise for anyone who least expect it.
1030* OneHitKill: Getting crushed by it will destroy your Slug [[ArmoredCoffins and you]] instantly.
1031* SpiderTank: A tank with four "legs" that allow it to walk or crouch.
1032[[/folder]]
1033
1034[[folder:Big Shiee]]
1035[[quoteright:271:https://static.tvtropes.org/pmwiki/pub/images/big_shiee.png]]
1036
1037A large amphibious tank, using its treads to travel like a conventional tank. It is armed with several 75mm APDS cannons, as well as a large main cannon which is hidden on the front. It literally serves as a land battleship.
1038----
1039* BackgroundBoss: It attacks the player from the background, never once entering the foreground.
1040* {{BFG}}: It will occasionally reveal a HUGE cannon that fires a large, exploding, shells. Once its health gets low enough, the remaining turrets (if all of them weren't destroyed) will self destruct and will solely attack with its main cannon.
1041* MilitaryMashupMachine: It is essentially a land battleship on tank treads, outfitted with lots of turrets, and an incredibly huge cannon.
1042* RocketJump: Surprisingly, you can use the explosions from its {{BFG}} to boost yourself and get a better shot at it.
1043* TacticalSuicideBoss: If it didn't open itself up to expose its huge cannon, it would be functionally invincible.
1044* TankGoodness: A cross between a battleship and a tank, and boasting lots of firepower that can give the Shoe & Karn a run for their money.
1045[[/folder]]
1046
1047[[folder:Hozmi]]
1048[[quoteright:278:https://static.tvtropes.org/pmwiki/pub/images/hozmi.png]]
1049
1050A nuclear-powered submarine designed for naval battles. It is possible that the Hozmi was constructed with alien technology.
1051----
1052* AbandonShip: When defeated, Rebel soldiers can be seen jumping out of it and into the sewer water.
1053* DownTheDrain: The Hozmi is fought in a sewer, for some reason.
1054* ShockAndAwe: The main turret has an electrical cannon that fires an electrical laser, while it also fires electrical spheres at you.
1055* ShowsDamage: The sections of its body appear to become increasingly damaged as you fire at those specific sections.
1056* SuspiciouslySimilarSubstitute: Of Tani Oh, being equipped with a laser cannon-like weapon and the player has to shoot it from below.
1057* WaveMotionGun: The main turret fires an electrical laser not unlike Tani Oh's cannon.
1058[[/folder]]
1059
1060[[folder:Dai-Manji]]
1061[[quoteright:163:https://static.tvtropes.org/pmwiki/pub/images/dai_manji.png]]
1062
1063Large spherical spacecraft used by the Mars People, it is much larger than the Mini-saucers and boasts significantly more armor and firepower. The penultimate mini-boss of the final mission.
1064----
1065* BaitAndSwitchBoss: Morden prepares to engage you in a new craft before the Dai-Manji blows it to bits and kidnaps Morden, beginning the actual fight.
1066* CombiningMecha: Once beaten, the Rugname appears and the Dai-Manji attaches to its bottom hull, becoming the main weapon.
1067* DegradedBoss: In ''Metal Slug 3'', you have to fight them as GiantMook enemies in the final stage.
1068* DeathFromAbove: Has a carpet bombing like attack similar to the Hi-Do, except this one fires indestructible energy bolts.
1069* FlunkyBoss: Constantly spawns Mars People in flying saucers to harass the player characters.
1070* MeaningfulBackgroundEvent: As soon as the Dai-Manji engages you, an aerial dogfight ensues between the Rebels and the Martians in the background. This continues on until the Rugname is destroyed.
1071* ShockAndAwe: Attacks with an aimed electrical laser attack.
1072[[/folder]]
1073
1074[[folder:Rugname]]
1075[[quoteright:304:https://static.tvtropes.org/pmwiki/pub/images/rugname.png]]
1076
1077The Mars People's mothership and the final boss of ''2/X''. It is very heavily armored, and far too large to destroy with conventional Earth weaponry. It can be temporarily defeated by destroying an attached Dai-Manji. However, the only way to destroy the Rugname for good is by attacking the Martian leader Rootmars, who controls every aspect of the ship with his brain. Forcefully severing Rootmars from the ship results in total system failure, causing the ship to collapse in the atmosphere.
1078----
1079* FlunkyBoss: Constantly spawns Mars People in flying saucers to harass the player characters.
1080* MiniBoss: In ''Metal Slug 3'', you have to fight it as a miniboss in the final stage.
1081* SequentialBoss: Fought immediately after the Dai-Manji, with the latter attaching itself to Rugname's body, becoming its core and main weapon.
1082* ShockAndAwe: Attacks with an aimed electrical laser attack from its Dai-Manji attachment.
1083* ShoutOut: The way it's defeated in ''Metal Slug 2/X'' is obviously a shout out to ''Film/IndependenceDay'', where an aircraft crashes into a weak spot.
1084* WaveMotionGun: It is capable of firing a huge laser cannon below it.
1085[[/folder]]
1086
1087!!''Metal Slug 3''
1088[[folder:Huge Hermit]]
1089[[quoteright:266:https://static.tvtropes.org/pmwiki/pub/images/huge_hermit.png]]
1090
1091A giant mutated hermit crab originally from Dr. Moreau's Island. It was later captured by the Rebel Army and later weaponized by fitting a giant tank as its "shell".
1092----
1093* AdvancingBossOfDoom: It constantly advances towards the player characters, forcing them to keep moving lest they get crushed by it or fall into the water.
1094* {{BFG}}: Once it TurnsRed, the tank opens up and reveals a huge cannon that fires large bombs to destroy the terrain.
1095* BreadEggsBreadedEggs: The first mission itself has you fight either the Rebels or giant crabs in two separate paths. Both concepts converge with the Huge Hermit battle.
1096* {{Fireballs}}: What the tank shoots at the heroes in its first phase.
1097* KingMook: Again, it's a larger, armored version of the mission's "regular" giant crabs.
1098* GiantEnemyCrab: An enormous hermit crab with a ''tank'' as its shell.
1099* StealthPun: It has a huge tank in place of a shell. In other words, it's a tank shell.
1100* TankGoodness: It carries an enormous tank on its back in place of a shell.
1101* WarmUpBoss: Its attacks are relatively easy to avoid, and you even get a Metal Slug or a Slugnoid at the start of the battle to assist you. It becomes even easier once it stops using the fireballs and starts using the large cannon.
1102* WeaponizedAnimal: A huge hermit crab with an enormous tank for its shell.
1103[[/folder]]
1104
1105[[folder:Monoeye UFO]]
1106[[quoteright:160:https://static.tvtropes.org/pmwiki/pub/images/monoeye_ufo.png]]
1107[[caption-width-right:160:Monoeye UFO]]
1108
1109[[quoteright:100:https://static.tvtropes.org/pmwiki/pub/images/monoeye_alien_ms.png]]
1110[[caption-width-right:100:Monoeye Alien]]
1111
1112A strange artifact of alien origin that was created to serve as a beacon for the Martians. It is occupied by the Monoeyes and possesses a strange energy that is capable of turning people into mindless zombies.
1113----
1114* AbnormalAmmo: The Monoeye UFO attacks by dropping monoliths on the player characters.
1115* CrosshairAware: It targets a player with a green laser before dropping a monolith on them.
1116* {{Cyclops}}: The Monoeye aliens that protect it [[ExactlyWhatItSaysOnTheTin all have a single eye]].
1117* DeathFromAbove: Its sole attack is to drop monoliths from above that slowly sink into the ground and also act as obstacles.
1118* EyeBeams: The Monoeye aliens attack by firing fireball like projectiles from their eyes.
1119* HoistByHisOwnPetard: Using the zombie [[BloodyMurder blood vomit]] can deal incredible damage to the Monoeyes and the Monoeye UFO. This is only usable if the player gets zombified, by the very energy the Monoeye UFO spreads around. In fact, certain versions of the game even give you an achievement for beating them as a Zombie.
1120* TheMonolith: Drops monoliths with alien inscriptions on the player characters. They act as obstacles that remove themselves over time as they sink into the ground (faster if shot at)
1121* SequentialBoss: After fighting the MiniBoss Monoeyes, the artifact comes to life and start attacking on its own.
1122* TurnsRed: When its health gets low, it starts glowing orange instead of green, and it drops monoliths at a faster rate.
1123* TheVirus: The Monolith is responsible for spreading a strange energy that turned the people in the level into zombies.
1124* WhenAllYouHaveIsAHammer: Unique for the series, both the Monoeyes and their UFO itself have only one attack apiece. They basically just use their single attack in different patterns or more quickly when damaged.
1125* WolfpackBoss: The first phase has six to eight Monoeyes appear and float around the structure, and coordinate their eye beam attacks. Thankfully they're not too durable.
1126* ZombieApocalypse: It is the cause of the zombie outbreak that has infected several people in the level and possibly the player.
1127[[/folder]]
1128
1129[[folder:Jupiter King]]
1130[[quoteright:249:https://static.tvtropes.org/pmwiki/pub/images/jupiter_king.png]]
1131
1132A giant robot created by the Rebel Army to guard their secret factory. It is heavily armored in order to protect the nuclear reactor inside its body. The lightly-armored head (which resembles a toy robot's head) is the weak spot of the robot. The left hand of the robot is a missile launcher, allowing the robot to fire a large number of homing missiles. The right hand of the robot is a pincer claw, which is used to destroy the ground in front of it. The robot's eyes are also capable of firing lasers to vaporize the player. It also has a "belly button" that can create a rocket, which the robot grabs and plunges into the ground.
1133----
1134* AttackItsWeakPoint: It is only vulnerable in the head.
1135* BossArenaUrgency: Downplayed, but the Jupiter King uses its large missiles to destroy parts of the floor, sinking it into the molten metal. However, not only does the Jupiter King move backwards after the attack to give the players a little more room, but they can also jump on its own body.
1136* ColossusClimb: Players can attack its head from up close, such as lobbing grenades, by climbing up the missile protruding from its chest. It's tricky, but can do greater damage than shooting from below.
1137* EyeBeams: It is capable of sweeping a great area with electrical eye beams.
1138* {{Fireballs}}: Every time it smashes the giant rocket on the ground, it'll explode into a slew of fireballs that rain down.
1139* {{Hammerspace}}: Capable of horizontally drawing a missile longer than the body from which it is stored, multiple times.
1140* HomingProjectile: The small missiles it fires out will home in on the player characters.
1141* KillerRobot: A gigantic, weaponized toy robot.
1142* MacrossMissileMassacre: In place of its left arm is a multi-missile launcher that fires destructible homing missiles.
1143* ShockAndAwe: Getting hit by its eye beams will electrocute the player character.
1144[[/folder]]
1145
1146[[folder:Sol Dae Rokker]]
1147[[quoteright:222:https://static.tvtropes.org/pmwiki/pub/images/sol_dae_rokker.png]]
1148
1149An instrument of the Sun God in Japanese mythology. This lifeform is in charge of protecting its ancient ruins from intruders. Due to the conflict of the Rebel Army and Regular Army around the ransacked ruins, Sol Dae Rokker became furious and started attacking anyone who is responsible.
1150----
1151* AndIMustScream: Getting hit by its WaveMotionGun will turn the player character into a rain of coins.
1152* AttackItsWeakPoint: Its only vulnerable on the rather small PowerCrystal on its forehead.
1153* GiantSpaceFleaFromNowhere: You spend the entire level battling Rebels, before going into a pyramid infested with man-eating plants and giant insects. Then you fight an almighty Sun God annoyed by all the ruckus. What?
1154* PowerCrystal: This serves as its weak point and also allows it to fire its FlechetteStorm attack.
1155* FlechetteStorm: Fires spiked projectiles of light from its crystal. Yellow ones are aimed at random while red ones are aimed at the player characters.
1156* LoneWolfBoss: It isn't associated with any enemy faction at all.
1157* MeaningfulName: Sol Dae Rokker is a play on "Sol De Roca", which means "Sun made of rock" in Spanish.
1158* ShapingYourAttacks: One of its attacks consists of summoning wolf spirits that act as explosive projectiles.
1159* TurnsRed: In both the literal and trope sense. It'll start turning red as it takes damage, and its attacks will also become faster.
1160* WaveMotionGun: It is capable of firing one from its "mouth". Getting hit by it will turn the player into coins.
1161[[/folder]]
1162
1163!!''Metal Slug 4''
1164
1165[[folder:Brave Gurerrier]]
1166[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/brave_guerrier.png]]
1167
1168A support blimp created by the Rebel Army and Amadeus Syndicate. It is used for carrying troops to the field and to give support fire from any range.
1169----
1170* BackgroundBoss: It assists the Sea Satan by firing missiles at you from the background, despite being heavily damaged from the previous battle.
1171* CoolAirship: A huge airship constructed by both the Rebels and Amadeus Syndicate, and carries a plethora of weaponry.
1172* DeathFromAbove: All the blimp's attacks comes from above the player, from cannons to bouncing balls to missiles.
1173* FiveSecondForeshadowing: The Brave Guerrier appears in the background deploying missiles that proceed to sink the cruise ship setting of Mission 4, which sets up the battle against the Sea Satan.
1174* NotQuiteDead: Despite sustaining heavy damage from the previous battle (up to including having its bridge destroyed and the pilots killed), it somehow manages to find its way to the ocean and assists the Sea Satan.
1175* SequentialBoss: You have to fight its dorsal section, then the rear half of the gondola, then the front half, in three separate phases.
1176* WarmupBoss: It does have three phases as a boss, the first which is borderline zero-effort; two of it's three attacks are cannons capable of firing in a ''straight'' line, where it's guaranteed to miss as long as you stand on the screen's right. The third drops bouncing mines that can be blasted with the Heavy Machine-Gun you're conveniently given before the fight. It's second segment fires a homing missile that can be avoided by jumping, besides dispensing weak rebels you can slice up. The third and last segment is the only part worthy of a challenge, but it's nowhere as difficult as later bosses.
1177[[/folder]]
1178
1179[[folder:Toschka Dalanue]]
1180[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/toschka_dalanue.png]]
1181
1182A pillbox tower that serves as a vigilance spot and a barrier against anyone foolish enough to cross its path.
1183----
1184* {{BFG}}: The top section carries Big Shiee's huge cannon and fires similar explosive bullets.
1185* ClownCarBase: One of its segments can store an unlimited number of soldiers.
1186* SequentialBoss: You have to fight ''five'' different "floors" of the tower.
1187[[/folder]]
1188
1189[[folder:The Iron]]
1190[[quoteright:186:https://static.tvtropes.org/pmwiki/pub/images/the_iron_ms.png]]
1191
1192A customized version of the Iron Nokana armored combat vehicle created by the Amadeus Syndicate. It is equipped with tank treads which allows the vehicle to move faster on any terrain, and has even more improved armor and firepower. Unlike the original Iron Nokana, the Iron lacks the ability to rise up on stilts and reveal any hidden weapons underneath.
1193----
1194* ActuallyADoombot: Not the Iron itself, but the Morden piloting the vehicle is revealed to be a decoy, as stated in ''Metal Slug Attack''.
1195* ChainsawGood: One of its attacks is a foldable buzzsaw.
1196* FlunkyBoss: There will ''always'' be a single MH-6S Masknell helicopter assisting it, at all times. Which makes the battle difficult because players will need to avoid the Iron's attacks from the front simultaneously with the helicopter's assault from above.
1197* TankGoodness: A modified Iron Nokana that appears to be more tank-like instead of a truck.
1198[[/folder]]
1199
1200[[folder:Big John]]
1201[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/big_john_ms.png]]
1202
1203[[caption-width-right:240:[[labelnote:Big John (Robotic Frame)]]\
1204https://static.tvtropes.org/pmwiki/pub/images/big_john_robotic_frame.png[[/labelnote]]]]
1205
1206A giant animatronic originally belonging to an amusement park. It was later converted into a weapon by the Amadeus Syndicate, using a virus similar to the purple gas and Monoeye UFO's energy to turn everyone into mummies and zombies.
1207----
1208* HoistByHisOwnPetard: Using the zombie [[BloodyMurder blood vomit]] can also deal incredible damage to it. This is only usable if the player gets zombified by the zombie virus bubbles it drops.
1209* SequentialBoss: Step 1: Destroy its descending claw. Step 2. Blow up its cannons, which drops purple fireballs on you. Step 3. Survive an onslaught of the Big John's zombie virus while battling its main head.
1210* TheVirus: It releases bubbles filled with the zombie virus.
1211* ZombieApocalypse: It is the cause of the zombie outbreak that has infected several people in the level and possibly the player.
1212[[/folder]]
1213
1214[[folder:Sea Satan]]
1215[[quoteright:304:https://static.tvtropes.org/pmwiki/pub/images/sea_satan_ms.png]]
1216
1217A huge submarine used by the Amadeus Syndicate. It can stealthily destroy ships or aggressively engage them head on, and can also kill any personnel aboard using its Gatling gun and dissipate its target using its missiles.
1218----
1219* DualBoss: Subverted; it's backed up by the Guerrier during the battle, where the airship will sic missiles from the background. But players don't get to finish off the Guerrier; once Sea Satan is down the level then ends.
1220* FlunkyBoss: For most of the battle, you'll be fighting rebel soldiers swarming out of it's hatches while avoiding it's missiles. It then changes tactics to launching rockets from under the sea, before resurfacing to unleash another wave of rebels. Rinse and repeat.
1221* GatlingGood: Carries a Gatling gun that will fire at the player if they're on top of it.
1222[[/folder]]
1223
1224[[folder:Amadeus Mother Computer]]
1225[[quoteright:160:https://static.tvtropes.org/pmwiki/pub/images/amadeus_mother_computer.png]]
1226
1227[[caption-width-right:160:[[labelnote:Amadeus Type α]]\
1228https://static.tvtropes.org/pmwiki/pub/images/amadeus_type_alpha.png[[/labelnote]]]]
1229
1230[[caption-width-right:160:[[labelnote:Amadeus Type β]]\
1231https://static.tvtropes.org/pmwiki/pub/images/amadeus_type_beta.png[[/labelnote]]]]
1232
1233The Mother Computer is the Amadeus Syndicate's main computer frame piloted by the Doctor.
1234----
1235* AllYourPowersCombined: The Mother Computer carries the attack patterns recovered from the Martians, as seen in the final mission of the previous game. As such, it can fire green energy rings similar to the Martian brain-pods, release projectiles similar to the Mini-UFO, and cover the screen in a hard-to-avoid circular blast much like Rootmars.
1236* BackgroundBoss: The computer's final form is situated in the background.
1237* BeamSpam: The final form ''loves'' its lasers.
1238* ChainsawGood: Type β can deploy a giant buzzsaw that travels the entire length of the floor.
1239* ChestBlaster: They're not completely robots, but the first two forms both have weapons on their main chest areas: Type α has missile launchers, while Type β uses miniguns.
1240* FlunkyBoss: The Type β can deploy airborne drones, while the main reactor can sometimes summon ground robots.
1241* LoadBearingBoss: Once the Mother Computer is destroyed, the heroes have to escape from the destructing base.
1242* ReflectingLaser: One wave of the main reactor's laser attacks can bounce all over the screen.
1243* SequentialBoss: The player has to fight the Type α Mother Computer, followed by the Type β Mother Computer, and then the main reactor.
1244* StationaryBoss: All three forms are fixed to a single spot while attacking with projectiles.
1245[[/folder]]
1246
1247!!''Metal Slug 5''
1248
1249[[folder:Metal Rear]]
1250[[quoteright:171:https://static.tvtropes.org/pmwiki/pub/images/metal_rear.png]]
1251
1252A gigantic SV-001 created by the Ptolemaic Army. It moves nimbly despite its gigantic size.
1253----
1254* DavidVersusGoliath: You can bring a Metal Slug to battle where your Slug will be the David and Metal Rear will be the Goliath.
1255* EvilKnockoff: A gigantic knockoff of the SV-001 created by the Ptolemiac Army after they stole the Metal Slug's blueprints.
1256* {{Fireballs}}: Its main cannon fires large but slow moving fireballs out.
1257* GatlingGood: It is armed a gatling gun in the same spot that the Metal Slug has a machine gun in.
1258* OneHitKill: Getting crushed by it will instantly destroy the Slug you're in, as well as you.
1259* ShoutOut: Its name may be a reference to ''VideoGame/MetalGear''.
1260* TankGoodness: It is essentially a huge version of the Metal Slug that you use, and comes with all the dangerous weaponry too.
1261* WarmupBoss: The Metal Rear's cannons and gatling-gun are easily dodgeable, and serves to help you practice the game's new sliding move. You know the battle will be over in 20 seconds the moment a prisoner tags you with a Grenade Launcher.
1262[[/folder]]
1263
1264[[folder:Shooting Ray]]
1265[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/shooting_ray.png]]
1266
1267A large aircraft carrier created by the Ptolemaic Army that specializes in air combat.
1268----
1269* BulletHell: One of its attacks consists of firing a storm of flak shots forwards, when then drift back towards you in a hard-to-avoid field of bullets.
1270* CoolPlane: A gigantic aircraft used by the Ptolemaic Army.
1271* DavidVersusGoliath: You can choose to bring the Slug Flyer to the fight, where your Slug will be the David and the far larger Shooting Ray will be the Goliath.
1272* FlunkyBoss: It is capable of spawning helicopter firebombs that home in on you and can be destroyed.
1273* WeaponizedExhaust: One attack used by its rear section has it try to torch the player characters with its exhaust.
1274[[/folder]]
1275
1276[[folder:Screamer]]
1277[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/screamer_ms.png]]
1278
1279The Screamer is a mech specifically designed for climbing building walls. It is armed with multi-barreled missile launcher and a sonic cannon.
1280----
1281* ExactlyWhatItSaysOnTheTin: It is a machine that can unleash a shockwave strong enough to destroy a floor like a "sonic [[MakeSomeNoise scream]]".
1282* FlunkyBoss: Every now and then, the commander will pop out and summon two Ptolemaic soldiers to attack you.
1283* GlassShatteringSound: Uses a sonic cannon to demolish the current floor you're on.
1284* HomingProjectile: The Screamer is capable of using a homing missile launcher that fires destructible missiles.
1285* SpiderTank: A vertical version, but loosely based on an arachnid nonetheless.
1286* WallCrawl: The Screamer is fought at the side of a building where it crawls on.
1287[[/folder]]
1288
1289[[folder:Sand Marine]]
1290[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/sand_marine.png]]
1291
1292An amphibious vehicle created by the Ptolemaic Army that is specifically designed to travel in sandy terrain.
1293----
1294* DeathFromAbove: One of its more deadly attacks has it fire several projectiles into the air, which then rain down randomly in huge numbers.
1295* MilitaryMashupMachine: It's a submarine that [[SandIsWater operates in the desert sand in place of water]].
1296[[/folder]]
1297
1298[[folder:The Black Hound]]
1299[[quoteright:148:https://static.tvtropes.org/pmwiki/pub/images/the_black_hound.png]]
1300
1301The Black Hound is an unmanned variation of the SV-001/III Metal Slug created by the Ptolemaic Army using stolen tech and serves as a secret mid-boss.
1302----
1303* AIIsACrapshoot: Its AI goes rampant and starts attacking/killing its own Ptolemiac allies in the area before you face it.
1304* DarkIsEvil: The enemy Metal Slug appropriately has a dark color scheme.
1305* DiscardAndDraw: As an enemy, the Black Hound is capable of ramming, firing its main cannon, a laser, a mortar attack, and its own machinegun. As a playable unit in ''Advance'', it retains its capability to ram enemies and fire its main cannon, but lacks the laser, mortar and machinegun. Instead, it has the ability to [[HomingProjectile spam homing missiles]].
1306* MiniBoss: The Black Hound first appears as an optional boss in ''5'' before becoming playable in ''Advance.''
1307* OptionalBoss: Fighting the Black Hound is entirely optional in a secret area, and it gives no reward.
1308* PromotedToPlayable: In ''Metal Slug Advance'', finding the Black Hound's card will allow the player to use it. Unlike its encounter in ''5'', it primarily uses homing missile spam.
1309* SapientTank: It's a Metal Slug with ArtificialIntelligence that is supposed to function autonomously. But its AI doesn't seem very good as it [[AIIsACrapshoot quickly goes berserk and kills its own allies]].
1310
1311[[/folder]]
1312
1313!!''Metal Slug 6''
1314
1315[[folder:Bull Drill]]
1316[[quoteright:202:https://static.tvtropes.org/pmwiki/pub/images/bull_drill.png]]
1317
1318The Bull Drill is a large excavator used by the Rebels and is primarily designed to dig underground with ease. It has both a bulldozer blade and drill, hence its name.
1319----
1320* ConstructionVehicleRampage: It is a giant excavator-like vehicle weaponized by the Rebels.
1321* DeadlyDisc: Capable of launching a huge saw disc that advances towards you.
1322* DeathFromAbove: One of its attacks causes stalactites to fall from the ceiling.
1323* DishingOutDirt: It is capable of firing boulders at the player. During the second phase of the fight it can also use its drill to cause stalactites to rain down on the player.
1324* MilitaryMashupMachine: A cross between an excavator and a drilling machine.
1325* ThisIsADrill: It is capable of using its excavator drill to make rocks land on the area, and to attack.
1326* WarmupBoss: It doesn't move about, fires ground-based projectiles that can be easily avoided, flings slow-moving rocks as a ranged attack, and goes down in no time.
1327[[/folder]]
1328
1329[[folder:Iron Sentinel]]
1330[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/iron_sentinel_ms.png]]
1331
1332A giant mobile rocket launcher/tank piloted by General Morden. It is created with help from the Mars People.
1333----
1334* DeathFromAbove: One of its attacks has it launch a ''huge'' rocket into the air that will then crash into the ground and cause a fiery shockwave.
1335* {{Hammerspace}}: Much like the King Jupiter, it can fire missiles larger and especially longer than the vehicle itself.
1336* InterestingSituationDuel: You fight on the side of this thing as it slides down a hill.
1337* MacrossMissileMassacre: Most of its attacks consist of launching several rockets in various patterns at you.
1338[[/folder]]
1339
1340[[folder:Brain Robot]]
1341[[quoteright:230:https://static.tvtropes.org/pmwiki/pub/images/brain_robot_ms.png]]
1342
1343A large Invader combat robot controlled by an artificial brain, which is housed inside a glass dome in order to protect and preserve it. It also has eyes connected to the brain through nerve cords.
1344----
1345* AdvancingBossOfDoom: It'll advance on the player, forcing you to keep moving ahead.
1346* BerserkButton: Bait it into using its melee attack too often or take too long to defeat it and it will keep swinging its arms while moving, limiting the player's safe space. The player will know when it is enraged when it does an angry stomping motion.
1347* BrainInAJar: Its head appears to have a huge, artificially-made brain within that controls the robot.
1348* CarFu: One of its attacks consists of grabbing a wrecked truck from the sewage and tossing it at the heroes.
1349* EnergyBall: Its brain fires these out forwards, which then stop before aiming and flying at the player characters.
1350* KillerRobot: A large Invader-made, BrainInAJar robot hellbent on chasing and killing the heroes. Prior to that, it simply wanders alone in the sewers.
1351* ShockAndAwe: It is capable of electrocuting the entire floor. To avoid this, the player need to stand on one of those crates that appear in the arena. It can also fire homing electric orbs at the player.
1352* WhatTheFuAreYouDoing: For some inexplicable reason, prior to the boss battle, the Brain Robot will strike a Shaolin crane-style kung-fu pose, complete with standing on one leg, before deciding to pursue the players instead. It's weird, but ''then again'' you fought this guy in China...
1353[[/folder]]
1354
1355[[folder:Elder Centipede]]
1356[[quoteright:232:https://static.tvtropes.org/pmwiki/pub/images/elder_centipede_ms.png]]
1357
1358The Elder Centipede is an ancient arthropod with deadly acid spitting capabilities and some level of flight.
1359----
1360* AttackItsWeakPoint: Its head is the only vulnerable spot.
1361* ColossusClimb: If you're on foot without the Slug Flyer, you ''will'' spend much of the battle running across its back while avoiding its attacks. It will even shed its skin in an attempt to shake you off, which will kill you if you fail to jump in time.
1362* OutsideContextProblem: It is not part of the Invaders, being simply an Earth creature from ancient times and was likely disturbed during the invasion.
1363* SandWorm: A sea variant instead. It also acts as a SegmentedSerpent. ''Metal Slug Attack'' would instead play this trope straight as it emerges from under the sand.
1364* SuperSpit: It is capable of spitting purple acid at the player characters or even spewing a huge stream of deadly microorganisms.
1365[[/folder]]
1366
1367!!''Metal Slug 7/XX''
1368
1369[[folder:Worm Mecha]]
1370[[quoteright:304:https://static.tvtropes.org/pmwiki/pub/images/worm_mecha_ms.png]]
1371
1372A segmented, worm-like drilling machine piloted by Morden.
1373----
1374* ClownCarBase: Some of the segments can individually deploy soldiers.
1375* {{Foreshadowing}}: The Kraken's tentacles are pretty much recolored and smaller versions of the Worm Mecha's sprites.
1376* SegmentedSerpent: Each of the segments are destructible and will help with lessening its firepower.
1377* WarmupBoss: Comes in a variety of segments, but each of these segments has ''pathetic'' health.
1378[[/folder]]
1379
1380[[folder:Crablops]]
1381[[quoteright:304:https://static.tvtropes.org/pmwiki/pub/images/crabclops_ms.png]]
1382
1383[[caption-width-right:304:[[labelnote:Crabclops Type-Upper]]\
1384https://static.tvtropes.org/pmwiki/pub/images/crabclops_type_upper.png[[/labelnote]]]]
1385
1386[[caption-width-right:304:[[labelnote:Crabclops Type-Lower]]\
1387https://static.tvtropes.org/pmwiki/pub/images/crabclops_type_lower.png[[/labelnote]]]]
1388
1389A giant one-eyed crab-shaped mecha. Its head and arms can be separated from its body.
1390----
1391* AttackItsWeakPoint: Takes bonus damage if you can hit it in the head. To do this you'll either need to have brought Slug Trolley cannons, which can fire into the background, or else launch missiles from the minecarts below you.
1392* BackgroundBoss: In its first encounter, it attacks you from the background, to the point where only its hands are vulnerable. If you don't have the Slug Trolley you'll need to shoot the minecarts so they'll launch the missiles they're holding in the air that home in on it.
1393* BossArenaIdiocy: Minecarts carrying rockets will constantly spawn at the bottom rails, and shooting them will cause them to launch a missile at Crablops for huge damage.
1394* CyberCyclops: Like its name suggests, it has a single mechanical eye.
1395* DetachmentCombat: The second battle against it reveals that it can detach its head and torso from its legs, and [[DualBoss both are fought as separate targets]].
1396* DishingOutDirt: Both encounters with it has it capable of grabbing a stalactite from the cave ceiling and dropping it on you.
1397* DualBoss: In Mission 3, its head and arms detaches from its body and you have to fight both of them.
1398* EyeBeams: It attacks you with these in its first encounter.
1399* FlunkyBoss: Capable of deploying containers that spawn mole drones to attack you. The second time it's fought, it also drops exploding maggots and rebel soldiers.
1400* GiantEnemyCrab: It is a crab-like mecha with the capability of splitting into two, and also has a lot of firepower.
1401* InterestingSituationDuel: Partway through the second encounter, you'll board a diagonal platform lift. Once one of the halves is down, the other will attack you more relentlessly as the lift ascends.
1402* MacrossMissileMassacre: It has a multi-homing missile launcher on its head, which it'll use in its first encounter.
1403* MeaningfulName: A crab-like robot with singular eye, hence it is a crab cyclops.
1404* NotQuiteDead: When defeated in Mission 2, it is seen relatively intact, if powered down. Sure enough, it returns as the boss of Mission 3.
1405* PuzzleBoss: In its first encounter, you can only attack its arms. In order to do good damage to it, you need to shoot the conveniently-placed minecarts so they'll fire the missiles they're loaded with straight at Crablops.
1406* RecurringBoss: It's fought as both the second and third boss of the game, except in different situations.
1407* SpiderTank: Its bottom half comes equipped with a {{BFG}} during the second fight.
1408* WeaponizedExhaust: Its bottom half is capable of using an exhaust cannon during the second time it's fought, once the top half is destroyed.
1409[[/folder]]
1410
1411[[folder:Fall Climber]]
1412[[quoteright:318:https://static.tvtropes.org/pmwiki/pub/images/fall_mecha_ms.png]]
1413
1414A gorilla/crab-like mecha designed to climb up cliffs. It is armed with several weapons such as missile launchers and a laser cannon.
1415----
1416* AmbiguousSituation: It is left ambiguous if it was truly destroyed since it doesn't explode when defeated, instead using a WaveMotionGun to propel the player characters up to the level endpoint.
1417* ColossusClimb: Literally, the entire boss battle is spent with you standing on its head and "arms".
1418* FlunkyBoss: It will often summon two turrets on the waterfall face that fire various types of attack at you.
1419* InCaseOfBossFightBreakGlass: Its weakpoint is the glass-looking case in its middle, once its head armor is destroyed.
1420* InterestingSituationDuel: You fight it as it climbs up a waterfall, and the platforms you stand on is the boss itself and its arms.
1421* KillerGorilla: A mecha that appears to resemble a gorilla in terms of body shape.
1422* NotCompletelyUseless: The Drop Shot, one of the most useless and unreliable weapons in the game, works wonders on this boss, due to the players spending the fight ''standing on'' the Fall Mecha. Conveniently enough, during the battle a nearby prisoner will award players with a Drop Shot upon being tagged.
1423* WaveMotionGun: Once its top armor is blown off, it becomes capable of firing one out down the middle. It also uses one upon defeat, although this doesn't hurt you and instead propels you to the level endpoint.
1424[[/folder]]
1425
1426[[folder:The Union]]
1427[[quoteright:258:https://static.tvtropes.org/pmwiki/pub/images/the_union_ms.png]]
1428
1429[[caption-width-right:258:[[labelnote:Union 01]]\
1430https://static.tvtropes.org/pmwiki/pub/images/union_01_ms.png[[/labelnote]]]]
1431
1432[[caption-width-right:258:[[labelnote:Union 02]]\
1433https://static.tvtropes.org/pmwiki/pub/images/union_02_ms.png[[/labelnote]]]]
1434
1435[[caption-width-right:258:[[labelnote:Union 03]]\
1436https://static.tvtropes.org/pmwiki/pub/images/union_03_ms.png[[/labelnote]]]]
1437
1438A trio of autonomous vehicles consisting of a Head Tank (01), a VTOL (02), and a Slave Tank (03) with the ability to combine with each other. All three of them need to have their cores destroyed in order to be beaten.
1439----
1440* AttackItsWeakPoint: They're only vulnerable in the bright red cores on each of them.
1441* BossArenaIdiocy: If the head tank didn't have a convenient platform at its base for the player to stand on, it would be ''far'' more difficult to hit the Slave Tank. Likewise, if it didn't have a convenient area to stand on right in front of its weakpoint, it would be a lot more tricky to hit.
1442* ColossusClimb: You fight the Union while standing on them. Every now and then, you will need to jump between Union 1, 2 and 3 to either avoid attacks or to return fire.
1443* CombiningMecha: The three of them can combine together into a larger form. While they aren't quite threatening in this form, they can crush any player characters between any of the parts when they do so.
1444* DeathFromAbove: The Slave Tank is capable of firing several bombs into the air that rain on the player.
1445* FlunkyBoss: The VTOL can summon elemental pods to attack the player.
1446* GatlingGood: The VTOL has a gatling gun attachment on its front side.
1447* ICanStillFight: Destroying the core on one of them does not take it out of the battle, and it can still attack and move like normal. The fight's only over once all three lose their cores.
1448* InCaseOfBossFightBreakGlass: Their weakpoints appear to be red glass-looking cores.
1449* InterestingSituationDuel: The entire fight takes place on the vehicle(s) themselves, where your player character uses them as makeshift platforms.
1450* KilledOffscreen: When all three are defeated, your character leaps off as the trio move offscreen. After some explosion sounds and screen shaking, their wreckage then flies back on-screen from the right.
1451* MeaningfulName: The trio is collectively known as the Union, can combine with each other, and all three of them need to be destroyed to defeat them.
1452* ShoutOut: Being made of three different parts with an odd core-looking weakpoint in each of them, it's a reference to the fourth boss of ''VideoGame/{{RType}}''.
1453* WolfpackBoss: You fight all three of them at the same time.
1454[[/folder]]
1455
1456[[folder:Rebel Gigant]]
1457[[quoteright:145:https://static.tvtropes.org/pmwiki/pub/images/rebel_gigant_ms.png]]
1458
1459A huge mech that was developed by the Future Rebel army and bought into the present day. It is specifically designed to be controlled by Allen O'Neil. Despite its huge body and very tough armor, it has great agility. It's also equipped with various weaponry such as Homing missiles, and floating mines.
1460----
1461* DuelBoss: The boss battle consists of the player's Slug Gigant versus Allen O'Neil's Rebel Gigant, with no flunkies between you and him. If your Slug Gigant's health goes down, you automatically die and respawn as another cockpit for the Slug Gigant.
1462* EvilCounterpart: It's essentially a rebel army version of the Slug Gigant.
1463* HumongousMecha: It's far larger than most of the pilotable mechs in the series.
1464* MacrossMissileMassacre: It's equipped with a multi-homing missile launcher on its shoulder and Allen won't hesitate to spam it.
1465* MirrorBoss: You face it when piloting your Slug Gigant. In fact, if your Slug's health gets depleted, you die and you'll respawn with another cockpit for the Slug Gigant.
1466[[/folder]]
1467
1468[[folder:Kraken]]
1469[[quoteright:255:https://static.tvtropes.org/pmwiki/pub/images/kraken_ms.png]]
1470
1471The Kraken is the ultimate weapon brought by the Future Rebels to help launch another Morden coup d'etat. It is equipped with super thick photon armor which even protects it from lava as well as various weaponry from the future, such as cylinder grenades, and an ultra huge cannon. It is also equipped with armed tentacles for recharging its energy with lava.
1472----
1473* BattleAmongstTheFlames: You face it on a LavaPit with floating scrap metal.
1474* {{BFG}}: The main unit comes equipped with a huge cannon that destroys the scrap metal platforms on the lava.
1475* BackgroundBoss: The main unit stays in the distance while controlling its tentacles to attack the heroes.
1476* BossArenaUrgency: Subverted, both Kraken and its tentacles can destroy the metal scraps you're on, only for more scrap to show up to replace them.
1477* CombatTentacles: Eight of them, no less, and all of them are capable of using their own attacks. You need to destroy each individual one before the main head attacks you.
1478* DeathFromAbove: The main unit is capable of raining fireballs onto you or dropping cylinder grenades.
1479* {{Foreshadowing}}: It can be briefly seen emerging from the time portal as it gets destroyed.
1480* GameplayAndStorySegregation: It is capable of travelling under the lava, yet the Flame Shot will still damage it despite being less hot. Granted, you don't get the Flame Shot during the battle itself.
1481* MarathonBoss: The fight is separated into five phases, the first four involve destroying two of its eight tentacles, and the last being an attack on the main machine itself. Each tentacle has a good bit of health to complicate things.
1482* SequentialBoss: The first phases involve attacking and destroying its tentacles, before you can actually fight the main unit.
1483* ShoutOut: Its design appears to be like that of the [[DualBoss Trumpet Lillies]] from ''VideoGame/InTheHunt''.
1484[[/folder]]
1485

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