Necron Shock Trooper
Components: Necron Warrior, Zapper Racket 3000
Function: Guards, previously Accidental
Description: The result of an intern mistaking one of the fusion chambers for an atom annihilator (a hyper-advanced garbage disposal that leaves no byproducts), these Necrons look much like Necron Warriors, but mostly pitch black with yellow and grey highlights and red eyes as well as capes made of statically-charged metallic mesh. Their Gauss Flayers now function as they were originally intended or as extremely powerful tasers if they are so inclined, with voltages high enough to knock out a Tyranid for up to a week. Trained to capture instead of kill, when intruders get too close to the laboratory these Necrons were spawned from, they tune down (or up) the power of the taser function of their Gauss Flayers to knock them out.
Divine Raw Shock
Components: Raw Shock, Holy Terra and the planet's Orbital Defense System
Description: About as large as a yacht, this fusion resembles an Abstract Raw Shock, a variation of the first component of the fusion, but with grey skin pockmarked with the cities and structures of Holy Terra, with the Ecclesiarchal Palace, Imperial Palace, Hall of the Astronomican, Halls of Judgement, and the Church of the Emperor Deified clearly recognizable. Around its head is a halo that seemingly stems from Terra's Orbital Defense System. If a hostile entity gets too close, this halo will start spinning rapidly as it fires upon the assailant. As a result of placing a void shield around the planet in order to prevent any of its buildings from being damaged, it always hovers several inches off the ground, uses telekinesis to interact with objects, and anything that falls on it will simply bounce right off. As a result of the Astronomican being incorporated into the fusion, it can fire a psychic beam from the hole in its head that can utterly obliterate almost anything unfortunate enough to be in the line of fire.
Components: Female Ordo Xenos Inquisitor, Inca Dove, Secretary Bird
Function: Display, and to humiliate the first component of the fusion.
Description: About seven feet tall with a wingspan of eleven feet, this fusion's arms have been replaced with the wings of an Inca Dove. Evidence of the secretary bird component is apparent when looking at the legs, which have become just like said bird, and a 'collar' of feathers stemming from the secretary bird sits on the neck and can be splayed out at will. All of the inquisitor's clothing has been destroyed in the fusion process. Due to the Inca Dove component of the fusion process, this fusion is physically incapable of eating anything other than grains, seeds, grasses, fruits, and weeds, regurgitating anything that doesn't meet the criteria. Following repeated suicide attempts through starvation, this fusion must be force-fed a human of her height's daily nutritional requirement of apples and other fruits.
Components: A mannequin, a satellite dish, and least 1,000 different video cameras, camcorders, security cameras, film cameras, drones, and AIs
Description: This ten-foot-tall, lanky automaton sees through camera lenses placed all over its body. The most prominent ones are on its fingers, elbows, shoulders, knees, feet, back, and head, with the largest being in the place of its face. The rest of its body is made mostly of a mish-mash of screens, circuitry, wires, plastic, glass, and motors. On the balls of its feet are propellers that allow it to hover almost ten feet in the air. With an IQ of 2,000, it knows the true answer to dividing by zero, but will not tell it to anyone. If it senses an intruder in the laboratory, it sends out a signal to all other mechanical or partially mechanical fusions and machines to the intruder as well as confronting said intruder for capture.
Components: One camel spider, one housefly (accidental), a cinder block, one Johngarthia lagostoma crab, and one specimen of all known species of scorpion
Description: This fusion is a scorpion with a main body the size of an oil tanker and a tail that is five times the length of its body. The venom in its tail is enough to potentially kill a creature the size of the Tyranid Hive Mind within a week. Although its diamond-hard carapace glistens with a brilliant iridescence and appears to be smooth as glass at first, its surface texture stems from the cinder block used in the fusion process, having a texture similar to rough sandpaper. Its reflective carapace causes most shots to simply bounce off and has near immunity to Promethium. In the place of a scorpion's mandibles is the head of a camel spider. The crab component of the fusion is apparent when looking at its claws, with one designed for crushing and another designed for cutting. Due to an error in the fusion system that happened during its creation, it has two extra claw-tipped arms, with one claw designed for piercing and the other claw designed for slashing. Due to the housefly component, it has wings that are too small to let it fly, and its bites transmit an acidic venom. Deployed when there is an intruder that the machines and guards can't handle alone, this fusion can decimate an entire Ultramarine company within a single hour without aid.
Components: Several hundred assault rifles, twenty miniguns, one Battlewagon, and one M1 Abrams tank.
Description: Designed with Orks in mind, this large tank-like vehicle can only be piloted by two Orks and hold ten of them. This fusion is what you would get if Orks looted an M1 Abrams. The signature 'lower jaw' associated with most Ork vehicles is present, with multiple miniguns and assault lining the vehicle's sides and one long minigun in the place of the tank's main barrel. Used by Orks and Ork-based fusions defending the laboratory, these tanks are sometimes stowed away to Ork battlefields on distant planets without permission.
More fusions will be added as ideas come to me.