This is an ally who can serve as a weapon. Not in the sense of an Attack Animal but in that their ally picks them up and uses them to strike down their foes.
Sometimes more exotic solutions present themselves with characters who are capable of Voluntary Shapeshifting into a weapon (typically a powerful one, otherwise they would just be cutting their forces in half). Weapons which can manifest some sort of avatar or otherwise interact like any other character also count. A related trope is the Empathic Weapon, which seems to have some vague form of intelligence or link with its wielder but not enough to count as a person (although particular powerful examples might overlap with this trope under special circumstances).
An improvised version of this (i.e. picking up an ally and using them to strike an enemy) could overlap with Grievous Harm with a Body or Fastball Special if a habit is made of it (examples of these go on the relevant pages). If they're used as ammunition see Catapult to Glory. See also Drone Deployer. A subtrope of Living Weapon, and sister trope to Combining Mecha. Not to be confused with Human Weapon.
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Anime and Manga
A more pacifistic example is Peke from To Love-Ru. A two foot shapeshifting robot that usually forms the resident Magical Girlfriend's clothes, casual or otherwise. Peke can transform into anything the wearer wishes, including a whipped cream bikini.
In Soul Eater the ability to turn into a weapon is essentially an ability some people happen to have. While they can do damage on their own, they're more effective when someone else wields them (explicitly acting as an amplifier for their wielder's own Ki Attacks).
The weapon-people are stated in several places to be the results of experiments conducted by Arachne, combining the Witch Species' shape-shifting with normal humans. Which explains why they achieve their ultimate form by eating the soul of a witch.
Humorously, Soul Eater Not! states that the security scanners in airports go off just from weapons stepping through them. In fact, this is how many people discover they're weapons.
The Eldel Raids of Elemental Gelade are (generally hot) girls and women who form a bond with a human to tansform into absolutely devestating weapons. The downside to this is that they then have to re-charge through some way or another, for example, excessive eating or sleeping, or physical contact with their human.
The zanpakuto in Bleach are this in reverse in some cases; they start off as empathetic weapons and eventually begin to manifest a corporeal form to attack alongside their wielder. Most of these are just a more powerful weapon, but there are some exception's (Renji's turns into a giant snake, for example...with a Wave Motion Gun in its mouth).
Lilynette is effectively Starrk's zanpakuto, as both were originally part of the same Hollow but are now in separate bodies. Ukitake and Kyoraku are quite bemused by seeing pistol!Lilynette and Starrk arguing loudly. Perhaps their own zanpakuto aren't so chatty.
In the Zanpakuto Tales Filler Arc (which was semi-canon, since it was based on an idea that the manga's creater never made use of), all of the zanpakuto manifested humanoid forms (although this slowly wore off as they ran out of energy, so they returned to normal when the arc ended). It's implied that they appear this way in their wielders' Mental World but only Ichigo's (and the Filler Villain of the arc) has ever been shown.
A Crowning Moment of Funny version happens in One Piece, when Zoro and Usopp are chained together with indestructible Sea-Stone handcuffs. Usopp attaches himself to Zoro's arm and is given a name as a katana, something like this.
In YuYu Hakusho, the older Toguro brother can transform his body into a weapon for the younger to wield. He can apparently turn into any weapon, though he only appears visibly as a sword and a shield. In the English dub, he claims that he can even turn into a machine gun, which begs the question if he fires demon energy or pieces of himself as bullets.
In The Sacred Blacksmith, all demon swords which exist long enough will become capable of shapeshifting into a human form and vice versa at will. Cecily eventually gains Aria as her sword, and becomes the first person to see her as a friend instead of property. Some people try to buy Aria, which pisses Cecily off that they think of her as just a sword instead of a person.
In the very first season of The Slayers, Rezo confronts Zelgadis for the Orihalcon Statue. Zelgadis grabs Lina, and well...throws her, letting her scream all the way. Since Rezo is blind, this proves to be a good distraction even though she misses Rezo himself.
In Dinozaurs, the aptly-named "Dino Weapons" can change into weapons that attach to their fellow Dino Knights.
Briefly downplayed in Naruto, where the titular character uses the Transformation Jutsu to disguise himself as his ally's shuriken, enabling him to use his teammate's deliberate miss to slip past the enemy's defenses, drop the transformation, and nail him from behind with regular attacks.
3 years later, he essentially does the same thing, but with a Rasen-shuriken.
Madara Uchiha can equip a Tailed Beast with his Susanoo like it was a suit of armour.
Konoha Muramasa from Cube×Cursed×Curious can become this should she choose. Althouth others can do it she is the only one shown to do this frequently since most cursed tools are capable fighters on their own.
In the DOMA Arc of Yu-Gi-Oh!, The Claw of Hermos (given to Jonouchi by the Powers That Be) can transform monsters into powerful Equip Spells.
Valon, from the same arc, has a deck that's odd to say the least. His monsters look more like armor than they do creatures, and he can wear them like armor.
Also, Yugi tended to use Catapult Turtle (a monster that can use other monsters as weapons) fairly often. (See below.)
Yana Toboso's Rust Blaster manga featured this. Human transfer student Kei is the equippable ally - in this case the sheath of a vampire-killing lance - for vampire Aldred.
In Judgement Overman - Houkago no Kessha, Eiji wields Reppu (usually as a blade) in combat. Reppu is also capable of shapeshifting to various form of weapons (firearms, jet plane, etc) to aid Eiji in battle.
Kole from Teen Titans can turn herself into a crystal, and then her buddy uses her as a weapon. He normally uses her as a club.
There are several sentient firearms in Buck Godot: Zap Gun for Hire: Godot's sidearm, Junior, is purported to be sentient but has various reasons for not talking. Pistol Packin' Polaris Packrat's Smith and Wesson on the other hand, do talk.
In the movie The Twilight Saga: Breaking Dawn Part 2, Edward picks up Bella and swings her around like an ungainly club. ("The Move" is also seen in some of the trailers for the film.)
In Redwall, one hedgehog fought by rolling into a ball and having an accomplice roll him at the enemy using a long stick.
The Arms Monsters of Kamen Rider Kiva work a bit like the Imajin in that they transform into weapons that in turn cause a form change. Depending on your definition of "weapon", the living Transformation Trinket Kivat and his relatives may also count.
Kamen Rider Decade's Final Form Ride, which literally turned previous Heisei-era Kamen Riders into equippable allies based on their motifs or weaponry. Faiz, Blade and Kiva turned into a BFG,a BFS and a Bow. Agito turned into a hoverboard. Kuuga, Ryuki, Kabuto and Hibiki turned into a beetle, a dragon, another beetle and a bird (that also turned into a drum) to aid Decade in battle and Sword Form Den-O turned into... well, Momotaros (i.e, himself).
Similarly, the Second Rider, Kamen Rider Beast, uses the power of the Phantom Beast Chimera, who is primarily a lion with features of four other animals, Falcon, Chameleon, Dolphin and Buffalo. Beast's basic suit resembles a lion but also has access to Mantles which appear as animal heads on his right arm, allowing him to use the powers of the other four animals.
In Tokumei Sentai Go-Busters, the first three Go-Busters gain the ability to use the power of their robotic partners, the Buddyroids, who turn into data which forms armour on their suits in what is known as Powered Custom.
Attitude-era tag team The Headbangers were fond of using one another as weapons. One of their signature moves was Mosh powerbombing Thrasher directly on top of a downed opponent.
The Shock Attack Gun from Warhammer 40,000 launches grots and attack squigs through the rift into the midst of enemy lines.
The Doomdiver from Warhammer Fantasy Battles launches goblins to crash into their foes gleefully laughing.
Exalted: Demons can be smelted into exotic liquid called calcanth, and infused into weapons to make them stronger (and weirder). This process goes both ways. Thus, a Green Sun Prince can either have a legion of demons, or an armory's worth of demon-infused weapons.
Dungeons & Dragons: If you have the strength, you can swing other characters around as if they were weapons (although they would probably be counted as weapons meant for a creature larger than you). It's a lot more effective if the person you're swinging wears armor spikes, and has a lot of hit points.
The Magic: The Gathering card Artillerize involves basically turning a creature into a missile (in-game, this translates as sacrificing a creature to fuel a direct-damage spell).
Another way to invoke this trope involves Bludgeon Brawl, which causes all non-creature artifacts to be treated as equipment. When combined with Liquimetal Coating, which turns a non-artifact permanent into an artifact, it's possible for a creature to literally pick up a Planeswalker and smash things with him/her.
There's also the Living Weapon mechanic from the Scars of Mirrodin block, where Equipment cards with the ability enter the battlefield already attached to a newly-created 0/0 Germ token. Moving the Equipment "kills" it (that is, causes the Germ token attached to it to die). With the current policy that creatures can't be Equipment, this mechanic is the closest we're likely to get.
Yu-Gi-Oh! TCG has the Catapult Turtle that does the same as the Artillerize on Magic.
There's also Cannon Soldier and Man Thro' Tro. Technically, the effect of these monsters lets you tribute other monsters to inflict burn damage, but they suggest they so by using the tributed monsters like ammunition.
A more literal example would be the Dragunity, Vylon and the Inzektor archetypes which have the ability to turn other members of their group into equip cards to gain helpful abilities. Union Monsters have this power as well.
Union monsters can be equipped to other cards on your side of the field; some are specific (Pitch Dragon ONLY equips to Dark Blade), while others only specify a type (Heavy Mech Support Platform for Machines). They can be equipped or unequipped and summoned once per turn, and their main purpose is to act as an ATK boost.
BIONICLE: Click, a Scarabax Beetle, can transform into a shield for Mata Nui to use.
Disgaea 3 introduced a mechanic to the series called "Magi-change". This allowed any monster type unit to fuse with a humanoid unit by turning into a weapon for them to wield for a few turns.
The PSP remake of Disgaea 2 had this mechanic added, although (presumably to avoid breaking the game) you have to unlock the alternative plotline first.
Disgaea 4 takes it Up to Eleven by allowing as many as four monsters to fuse together before transforming into a weapon and allowing you to dual wield these weapons, thus allowing you to technically have as many as eight allies equipped at the same time.
The video game EOE Eve Of Extinction features weapons made by converting a human's neural structure into an operating system, the most powerful one's being the protagonist's girlfriend and The Dragon, who also happens to be The Man Behind the Man. Although its not made clear if former's an actual example of this, if she can project some sort of hologram or if the cutscenes show her in humanoid form for convenience sake The Dragon certainly is.
Sam sometimes uses Max as a weapon or anything needed in the moment. Taking to some extremes in the classic Hit the Road where Max is part of the inventory.
MapleStory has a recurring character in the Aran questline, Maha, the spirit of Aran's polearm. He gets indignant about being left behind, becomes sentimental when Aran remembers him (complete with Sand in My Eyes) and is responsible for at least one of Aran's job advancements, landing him squarely in type 2 territory.
In Whiplash, the player character consists of a weasel and a rabbit chained together. Spanx (the weasel) can use Redmond (the rabbit) as a weapon by swinging him on the chain to knock over guards and generally cause mayhem.
In Sonic Heroes (where you play as a team of three characters), your other two team members serve as projectiles for whichever of them you are controlling at that moment. Speed type characters use them to follow up their homing attack; flying types throw them and Power types spike them to enemies like volleyballs.
Skies of Arcadia: Legends: Cupil is Fina's companion/pet, usually worn around her wrist as a bracelet. In battle, he can transform into different weapons and objects and attack enemies for her.
The Star Dragon Sword from Suikoden runs the line between this and Empathic Weapon. The sword has a full personality and regularly talks to (and berates) it's wielder and his allies. You also have to defeat it in combat to use it in the second game, though once obtained it does not appear to act on it's own again.
In the 'Breegull Blaster' sections of Banjo-Tooie, Banjo wields Kazooie like a shotgun, so she can shoot eggs from her mouth while they're on the move.
The K-9000 Cyberdog Gun from Fallout: New Vegas is a fairly roundabout method of doing this; it consists of a dog's Brain in a Jar hooked up to cybernetic audio and olfactory equipment, and attached to a triple-barreled BFG to help aim it. An upgrade puts it on a drip-feed of intelligence-boosting drugs to increase the rate of fire.
Honedge (a Steel/Ghost sword pokemon) from Pokémon X and Y subverts this. Any trainer who attempts to wield it as a a weapon will find it draining their life force.
Tsukihime has the Seventh Holy Scripture. That's right, Ciel's BFG also falls under this trope. Her name is Nanako.
The gameplay in The Wonderful 101 is all about this. You combine large amounts of heroes to form different weapons and attacks.
Part of the Enemy Mine mechanic of Crash Twinsanity involves Crash using Dr. Cortex by either swinging him around like a hammer, throwing him at stuff or even using his body as a skateboard.
In Adventurers!Spybot is able to turn into a BFG, which Tesla wields with her usual enthusiasm (it's implied he has similar weapon modes, but we never see them).
Laser Pony of League of Super Redundant Heroes has lasers the originate behind his eyes, which means he's been blind since the first time he used his powers. There's a reason his helmet includes handle-bars for his teammates to grab...
Though in the opening sequence of the first season, he displayed the ability to shoot all by himself in his gun mode. Also, Starscream isn't the only one he relied on, as Soundwave has also occasionally wielded Megatron's alt mode.
G1's Galvatron didn't need anyone to wield him in his gun mode for him to shoot, nor did Shockwave (though Shockwave was once forcibly wielded by Bruticus and made to shoot his own security sentinels when the Combaticons invaded Cybertron).
G1 Sixshot had a weapon mode somewhat like Shockwave's
The Targetmaster gimmick from G1 paired figures with small robots called Targetmasters that could transform into weapons. Some newer figures have similar gimmicks revolving around Mini-Cons with weapon modes.
The Mini-Cons included with Power Core Combiners figures, in addition to having weapon modes for their commanders' robot and vehicle modes, also had armor modes that could attach to a combined robot's chest.
Ratbat and Laserbeak of Transformers Animated, turn into musical instruments that Soundwave can use sound based attacks and hypnotism.
The Seacons were a combiner team with six members; whoever wasn't the torso, an arm, or a leg became a gun for Piranacon to wield. (Since this sixth member doesn't become part of the combiner mind meld, it's usually Nautilator.)
In the second season finale of My Little Pony: Friendship Is Magic the Main Six are battling a horde of enemies. Twilight Sparkle is shooting magical beam attacks, and Pinkie Pie picks her up and aims her at a group of assailants. She even rotates Twilight's tail as though she were using it to fire off rounds like a Gatling gun. There's absolutely no reason why Pinkie Pie and Twilight should be able to do this (beyond possibly allowing Twilight to concentrate on firing while Pinkie aims), except that Pinkie has Reality Warper powers that run on Rule of Funny.
In the The Penguins of Madagascar short "Christmas Caper", Skipper uses Rico to shoot at Mr.Chew like a machine gun after he's swallowed a bowl of mints.
Animaniacs did this too, with Yakko using Wakko as a Gatling gun to shoot malted milk balls at a candy store owner.