Basically where monsters in [=RPGs=] can fight alongside the heroes. Allied monsters' individual personalities may exist (Paper Mario) or not (DragonQuest series to an extent). It's more likely in the latter case that [[DefeatMeansFriendship defeating them first is a requirement for them allying with you]]--though, it's not unheard of in the former case.

There is usually a [[TheGoomba Slime/Goomba]] type monster ally that can/will join earlier than other monster allies; they're quite likely to be a LethalJokeCharacter.

A subtrope of {{Mons}}. Please note that this is the case where the heroes always have HP whether or not the MonsterAllies do, and frequently enough, the hero(es) [[WeCannotGoOnWithoutYou is/are (a) designated survivor(s)]]. A nonsentient Monster Ally will usually be a PetMonstrosity. Monsters who are in fact the [[TheHero main]] [[PlayerCharacter characters]] are MonsterAdventurers.

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!!Examples:

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[[folder: Beat Em Up ]]

* In ''VideoGame/PhantomFighter'', you could get a baby ChineseVampire to join your side by ringing a mysterious bell.

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[[folder: First Person Shooter ]]

* In ''VideoGame/HalfLife2'' you can temporarily befriend and get help in storming an enemy facility from the previously hostile Antlions with the aid of some special pheromones.
* In a brief moment in ''VideoGame/{{Halo 3}}'', [[spoiler:[[ZombieApocalypse The Flood]] allies with Master Chief and the Arbiter in a desperate attempt to stop Prophet of Truth from firing the Halo rings]].

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[[folder: Hack And Slash ]]

* In ''VideoGame/{{Diablo}} II'', Necromancer class can create skeletons out of fallen enemies to fight alongside him. Until he learns the Revive spell, which is the pinnacle of necromancy because it animates a creature in a way that gives it access to all the intelligence it had in life but gives control to the Necromancer, they all turn into humanoid, human-sized skeletons--even if they were previously foot-tall imp demons. Or a ''cloud of flies''. Or a ghost, or a bug. At least the imps might have ''bones''.
** This is apparently justified by Necromancers not actually ''using'' the bones of a defeated enemy for creating the skeleton, but rather just using the dead energy of it to animate other bones. [[HandWave Somehow]].

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[[folder: Maze Game ]]

* The monsters in ''{{Sabrewulf}}'' don't quite fit this, but go here better than under {{Mons}}--they're treated as tools that happen to be living (e.g. a large sleeping creature that functions as a trampoline, or a Chinese dragon that can be used as a platform.) Learning to command them takes many years of training, so the main character is the only person in the game who's shown to use them. Unusually for this trope, however, a clear distinction is made between "good creatures" used exclusively by you and "bad creatures" that accompany the titular beast.
** Note that the above description doesn't match the game to which the wick goes, which is the one most familiar to 8-bit-era gamers; the ZXSpectrum version. Presumably {{Rare}} either remade the game, or at any rate recycled the title.

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[[folder: [[Massively Multiplayer Online Role Playing Game MMORP Gs ]]
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* The entire Hunter class from ''VideoGame/WorldOfWarcraft'' revolves around this, though they can only tame one class of monsters, beasts. Warlocks do a similiar thing with demons except they have less options and only command a total of five demon types permanently, though they can also enslave most other demons for a limited time and can summon two more powerful demons that may escape their control.
* ''VideoGame/{{Mabinogi}}'' has several ways to get MonsterAllies. The simplest is through the Pets premium-purchase feature. Pets have a limited daily summon time; and are subject to simplified versions of the aging, levelling, and skill mechanics. Pets can also be used as player characters, within the daily summon time limit; but can only interact with animal [=NPCs=] (two as of this edit). In the G3 expansion, the Dark Knight was released with the "Control of Chaos" skill; which allows limited, temporary control over any monster, with some skill-level based restrictions. As of G7, the Pet Taming skill allows all players to gain a similar ability.
* ''VideoGame/ShinMegamiTenseiImagine.'' It's a series staple.
* Lime the slime in ''VideoGame/{{Lunia}}'', an unlockable PlayerCharacter.

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[[folder: Platform Game ]]

* ''KirbySuperStar'' had the option to turn copy abilities into allied partners.

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[[folder: Puzzle Game ]]

* ''VideoGame/PuzzleQuest'': Some companions fall under this, and you can capture some monsters to use as mounts.

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[[folder: Real Time Strategy ]]

* ''VideoGame/LostMagic''
* They're the basic units in ''VideoGame/FinalFantasyXIIRevenantWings''.
* In ''VideoGame/WarCraftIII'' you can hire controllable creeps in mercenary camps.

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[[folder: Roguelike ]]

* ''VideoGame/DungeonCrawl'' has summoners, wands and spells of temporary enslavement, and scrolls of creature creation for temporary allies. Closest to the trope, however, is with Hill Orc Priests, who have a chance to convert other orcs they come across to friendly.
* ''VideoGame/{{Brogue}}'' has wands of domination, but there also exists chained and caged monsters within the dungeon that pledge their loyalty when rescued.
* ''VideoGame/{{Elona}}''. You can gain permanent allies by dominating existing creatures , nearly killing an existing creature and then throwing a ''Franchise/Pokemon'' ball at it, or reading scrolls of ally to summon an already allied creature; how many you can keep in your party at once depends on your charisma. Then, because of the [[WideOpenSandbox sort of game it is,]] you can then proceed to mix and match their abilities with Gene Engineering. Or sell them. Or put them out to pasture. Or pursue a romantic relationship with them.
* In ''VideoGame/{{Nethack}}'' most players start out with a pet kitten or puppy, while knight starts with a pet horse. You can tame a wild cat or dog by throwing a tripe ration[[note]]the stomach of a butchered animal[[/note]] at them, and tame a wild pony or horse by throwing an apple or carrot at it. You can tame monsters in general by reading a scroll of taming, casting the taming spell, or by [[spoiler:playing a magic harp]].

[[/folder]]

[[folder: Role Playing Game ]]

* Most ''ShinMegamiTensei'' games, where the main character usually fights alongside his demonic recruits; if he falls in battle, the game ends.
* ''VideoGame/DragonQuestV'' and ''VideoGame/DragonQuestVI''
* ''VideoGame/PaperMario'' and its sequel, arguably. The line defining "monster" in those games are quite blurred. Many of the partners that join Mario belong to the classic enemy types like Goombas and Koopas, but there exist both friendly and enemies of these. In some cases enemies don't even exist in that particular game. (Cheep-Cheeps and Boos in the first, for instance)
** While all your allies in the first game are based on classic Mario enemies and have attacks along the same theme, the second game mixes it up with a few characters of species previously seen as non-hostile NPC characters, never seen before at all, or [[spoiler: a former member of the QuirkyMinibossSquad]].
* The ''{{Lufia}}'' games.
** ''VideoGame/LufiaIIRiseOfTheSinistrals'' has "capsule monsters", a small group of monsters--each with their own element--that can be found outside of combat and recruited.
** ''Ruins of Lore'' allows you to capture and train ''any'' regular monster and teach them skills from other captured monsters. In both games, the player does not control the monster's actions.
* ''[[VideoGame/TalesOfSymphoniaDawnOfTheNewWorld Tales of Symphonia: Dawn of the New World]]'' allows you to tame and use up to two monsters in your party lineup.
** You can have up to 4 in your party at a time, and can fight with up to three of them, providing there is still a main character for the player to control. Monsters usually act on their own and attack whatever enemy they darn well please, but the in-battle menu allows the player to control on-the-fly what spells they cast (if they know any), and the Strategy sub-menu lets the player position them further or closer to the action and even order them to defend other characters. What's more, they level up and can even "evolve" into more powerful variations of their family.
** ''Narikiri Dungeon X'' expands on the concept further, by allowing you to tame practically ''any'' enemy (Final boss included), allows you replace all of your standard party members with them, and lets you assume direct control of them, as well.
* Kinda subverted in ''VideoGame/ArcanumOfSteamworksAndMagickObscura'' - characters with a high enough Persuasion skill can get "Gar, World's Smartest Orc" - who turns out to be an upper-class human who takes after a distant, presumably orcish ancestor.
* Taken to its logical end in ''VideoGame/PlanescapeTorment'' by making everyone who can join your party a monster (or at least, non PC race) of some sort.
** Except Ignus, who's... off for other reasons.
* ''VideoGame/InfiniteUndiscovery'' had Gustav, the pet bear of the RebelliousPrincess (who happened to look like every other bear enemy, but red) while several ''{{Suikoden}}'' games allowed you to recruit intelligent monsters as allies (sometimes as part of the 108, sometimes not). In both these cases, the powerful monster PC takes up two character slots because of its size and strength.
* In ''[[VideoGame/MakaiToshiSaGa The Final Fantasy Legend]]'' and [[VideoGame/SaGa2 its sequel]], monsters are a playable race and can change into other enemy monster types by eating meat dropped after battle. You can even compose your entire party of monsters, though in practice it makes for a much more difficult experience.
* The ''VideoGame/{{Geneforge}}'' series has as one of its premises the techno/magical art of Shaping, so the player, depending on class, can create at least one to use as a decoy, or surround themselves with a horde of them. Upgrading skills gets you more, bigger, monsters and more variety. In most of the games, your only permanent party members are your creations. They don't have their own personality, but you can name them and treat them as pets, or just use them disposably.
** In some of the games, at least one path will allow you to gain a rogue Creation ally if your diplomacy skill is high enough. They have personalities of their own, and you may or may not have to defeat them in battle.
* In ''LegendOfMana'' it's possible to obtain just about any non-Boss monster as a pet through one of two methods: either finding a Monster Egg, which will hatch into a random monster of that type, or by "recruiting" a Demi-Human monster in a certain zone (this requires having a certain mana level in that zone).
* ''VideoGame/TheElderScrollsIVOblivion'' included this with both the Frostcrag Spire DLC and the Shivering Isles addon. The Spire gives you the ability to create Atronachs (SIC) who would serve as your familiar until either dismissed or killed, and Shivering Isles allies you with non-hostile Gnarls near the end of the main quest. You can also get Golden Saint or Dark Seducers escorts once you've finished Shivering Isles, though you can't take them into anywhere that isn't a part of the Isles.
* The Spirit dream eaters in ''VideoGame/KingdomHearts3D'' serve as your party members and are the primary source of your new commands and abilities. They can created using dream pieces found in any of a great number of ways and have a pet aspect to them, being able to name, pet, feed, and play with them if you wish.
* In ''[[VideoGame/MightAndMagic Might & Magic VIII: Day of the Destroyer]]'' you could recruit into party a dragon (or even several, there were a total of four recruitable dragons in the game), while in most cases it required the player to fight their way through hostile members of their race first (which was not easy since they were one of the toughest monsters in the game) the prize was well worth the effort since such dragon was by far the strongest possible party member.
* ''UnchainedBlades'' has monsters in dungeons that you can "Unchain" (get them weak enough to go into Unchained status) and recruit into your party as "Followers". In this game's case, you can attach up to four Followers to their "Masters" (main party members), and the Followers can have up to three associated Animas (elements) that will allow their Masters to use special skills. The Followers will also occasionally perform follow-up attacks in battle, and take or deflect attacks targeted at their Master.

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[[folder: Tabletop Games ]]

* Second Edition Advanced ''DungeonsAndDragons'' had an entire sourcebook devoted to creating monstrous characters, titled 'The Complete Book Of Humanoids'. Third Edition had a similar sourcebook named 'Savage Species'. 3.5 brought a lot of that into the Monster Manual, and Fourth Edition put it all into the back of the Monster Manual.
* The "Into the Storm" expansion for RogueTrader allows you to employ orks or kroot in your party.

[[/folder]]

[[folder: Turn Based Strategy ]]

* All of the ''Franchise/{{Disgaea}}'' games let you make your own party of characters, many of which are monsters. In order to unlock a monster, you have to have defeated it in battle at least once, sometimes many times (because the cost of making monster units decreases with every member of the species you kill, and some monster classes are initially ''absurdly'' expensive) or throw them onto a base panel to capture them (only valid for non boss monsters of a decently lower level than your non-deployed units or the main character, depending on the game). They come with their own set of weapons to use, and can wear the same armor as humanoid characters.
** This is a feature of most NipponIchi strategy [=RPGs=], from LaPucelle on. In LaPucelle, enemy monsters can be directly converted into allies. In later titles, monster units are usually created from scratch by the player.
* ''VideoGame/FinalFantasyTactics'':
** Boco, Wiegraf's chocobo, which you can rescue and let join your party.
** The Mediator class with the Invite ability, which works on monster or human foes. They also get the 'tame' ability that automatically invites any monster [[DefeatMeansFriendship brought to critical due to their attack]].
** Reis -in human shape- whose main ability is to tame dragons, but can also tame other monsters by punching.
** Byblos, the Apanda-class demon that joins as a Guest in the final floor of the Deep Dungeon, and joins permanently if it survives.
* ''VideoGame/FinalFantasyTacticsAdvance'' lets you tame monsters, but they can't join you in battle directly. Instead, the Morpher class can use their abilities.
* ''VideoGame/FinalFantasyTacticsA2'' has some monsters join you, but only as guests.
** Chocobo Knights can also tame the birds, but they cannot exist separate from their tamer of they run off.
* ''OgreBattle'' and ''TacticsOgre''
* ''VideoGame/ArcTheLad II''

[[/folder]]

[[folder: Wide Open Sandbox ]]

* ''VideoGame/{{Starbound}}'': You can use capture pods to capture smaller, weakened monsters then send them out as an ally that attacks monsters that threaten you. There are a ''lot'' of monster types due to random generation of monster attributes.

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