First Forge

Kakugane I is wielded by Victor. Its Buso Renkin called Fatal Attraction. a gigantic war-axe that is capable of manipulating gravity. It can manipulate the gravity direction on larger or smaller scales. It can used to increase the gravitional pull on an object or reverse it. The axe can also be separated into two to be used as double tomahawks.

Kazuki Muto has Kakugane LXX, who's Buso Renkin takes form of Sunlight Heart takes the form of a spear-lance with a large decorative cloth attached. The cloth is turned into an energy force when it resonates with Kazuki's willpower.

Kakugane XVI is owned by Jinnai, a low-rank homunculus from the L.X.E. He uses kakugane XVI, which becomes the Buso Renkin Noisy Hamelin. It appears as a steel whip capable of vibrating itself and emitting sounds that can hypnotize anyone within its range. This has an effective range of about 100 yards, but the more people it hypnotizes, the weaker the effect. It can also amplify sound waves, allowing its user to hear from a distance. It can be used as a whip, but as such it is only a normal whip.

Kakugane XVII is owned by Shosei Sakaguchi, It takes the form of Buster Baron, a gigantic knight-like robot 57 m high with a weight of 550 tonnes, that attacks primarily with its fists. Its left and right shoulders, however, can be inserted with up to six alchemy warriors and their Kakuganes. The Kakuganes of the warriors inside are transferred to the Baron and become amplified to fit its size. It can also be summoned with just one of its body parts.

Kakugane XX is owned by Sekima Hiwatari, one of the Alchemy commanders. It takes the form of Blaze of Glory, a napalm bomb with hexagons all over it. This gives Hiwatari the ability to become one with flames, as such, the napalm bomb usually does not appear. The further the flames burn, the more powerful he is. As such, physical attacks will not work on him. Blaze of Glory is able to release a flame storm with a temperature as high as 5100˚C and a radius of 250 m. However, the flames still require oxygen in order to burn

Moonface's Buso Renkin, Satellite 30, allows him to create 30 copies of himself, each one having a different head for the different phases of the moon.

Tokiko Tsumura's kakugane is the death scythe Buso Renkin, Valkyrie Skirt. It is made out of 4 scythe-like blades that are attached to her thighs. She controls them via nerve impulses through her skin.

Kinjo has kakugane LII, which takes the form of a gauntlet attached to his right arm. He calls it Peaky Gulliver , and its special property is that it can change its size by absorbing elements from the air and which has small rockets that can propel attacks or allow flight.

Gouta's kakugane LV takes form of the Buso Renkin, Motor Gears. They take the form of two chakrams, which he can program the rpm and the angle of each throw. its speed and size which makes it extremely hard to see, along with the wide variety of uses the Motor Gear can utilize in combat. Gouta can use the Motor Gears in three different modes: Knuckle Duster, where Gouta places them on his fists to increase damage; Marine Diver, where Gouta places them on his heels to help him swim faster.; and Sky Walker, where Gouta puts them at the side of his heels to help him travel faster.

Kakugane LXI is Chouno Koshaku's kakugane, called Near Death Happiness. When activated it appears as black gunpowder that typically takes the form of a pair of butterfly wings on his back. He also can create a number of small butterflies from it that explode on impact and that he can use offensively or create a large butterfly which he can ride on. When all of the butterflies are used up, it takes three days to regenerate

Doctor Butterfly (Bashaku Chouno) has Buso Renkin LXX, Alice In Wonderland, This Chaff Buso Renkin has the same wing-like structure as Papillon's Near Death Happiness, but is platinum-white and confuses the nervous system. In concentrated mode, it is also able to directly affect a person's brain, giving the person hallucinations and illusions. Alice in Wonderland is also capable of disrupting radio and electric waves, and when in contact with water, can create a mist.

Captain Bravo has kakugane C, which he uses as the Buso Renkin Silver Skin which is his outfit. Upon impact from an attack, his outfit hardens into a regenerating metal; it is known as the strongest defense power in all known Buso Renkins. In addition to all this, Bravo has immense physical strength. Later it is revealed that the Silver Skin has another ability, which is named Silver Skin Reverse. This ability is used on the opponent to restrict his/her moves, rendering the victim defenseless against Bravo's powerful physical attacks. However, Reversed Wearing can be easily stopped if someone runs into it, as Bravo cannot control whom it can capture.

Chitose Tateyama uses Kakugane XCV, manifesting as the Buso Renkin Hermes Drive, a hexagonal radar that can detect enemies and allies. It can also be used to teleport objects up to 100 kg. The Hermes Drive itself can also be used as a mini-shield and as a hitting weapon

Hanaka Busujima uses Kakugane XXXIX, which manifests as the Buso Renkin Aerial Operator, a gas mask capable of mixing all gas type elements into poisonous or explosive mixtures. It also capable of flying, viewing distant objects, night vision, magnification, and filtering.

Genji Ikusabe His Buso Renkin is Kakugane XII, Gekisen a cross-like spear that can heal any wound of its holder. The spear is even capable of reviving Ikusabe even if Ikusabe's body is blown to pieces. However, Gekisen's flaw is that since it recovers automatically and at a high speed, if something gets caught into where one of Ikusabe's body parts should be, the recovery will fail. If Ikusabe is separated from his spear, then the weapon cannot heal him

Madoka Maruyama His Buso Renkin is Kakugane XXXII, Bubble Cage, a large number of wind-navigated fire balloons that will shrink the person it hits by 15 cm per hit; a person will vanish if he/she gets hit by too many bubble cages. By detonating one Bubble Cage, he can create wind force that'll drive other Bubble Cages towards the enemy. Although these balloons make laughing sounds when moving, they have no intelligence

Shinobu Negoro His Buso Renkin is Kakugane XIV, Secret Trail, a ninjato that can cut open paths to another space that only Negoro, who has the DNA that Secret Trail will recognize, can enter. The sword itself can also be thrown freely the world and the special space.

Rintarou Inukai His Buso Renkin is Kakugane XCII, Killer Rabies, a pair of mechanical dogs commanded by a dog flute held by Inukai; these dogs have twice the smelling power and ten times the strength and stamina of normal dogs. When in berserk mode, the dogs will kill anyone not holding the flute. Cutting both dogs in half during this mode will not affect them, since with lighter weight they move even faster. The only way to defeat the Buso Renkin is to cut the heads off.

Shusui Hayasaka He uses Kakugane XXIII, which manifests as the Buso Renkin Sword Samurai X a sword with a small charm attached at the end of the grip. The sword absorbs energy into the charm, and the user can make this energy discharge from the charm. This energy can only be used as a short-range attack and cannot stop kinetic energy from physical attacks; as such, its strength depends on the user's skill at kendo, making this a deadly weapon in Shusui's hands.

Ouka Hayasaka uses Kakugane XXII, which manifests as the Buso Renkin Angel Gozen, a set consisting of a bow, an autonomous robot named Gozen, and a glove. It attacks using a stream of arrows aimed by the robot, It has the ability where a special arrow is shot at a person and the user can absorb that person's injury. This is good for long-distance attacks, but ineffective when fighting close-quarters. Gozen is the automatic doll and is Ouka's "other" personality. Gozen acts as the main messenger between Papillon and Ouka, as Gozen's heart-shaped head ornament can receive and send messages and be used as a camera. Gozen is very hyperactive and loud unlike Ouka

Alexandria Powered uses Kakugane L, manifesting as the Buso Renkin Rurio Head, which is her only means of communication to the outside world, and is usually worn by Victoria. It is capable of controlling its wearer and searching the wearer's memories

Victoria Powered She uses Kakugane LI, manifesting as the Buso Renkin Underground Searchlight, which allows Victoria to generate a hidden cave that can only be entered when Victoria opens it. In its normal state it uses electricity and water from the Academy, but in an emergency it can provide a month's worth of water and electricity