LEGO Minifigure Design and construction

Minifigures generally feature six parts (widely referred to as tools in the toy industry): head, torso, hips, arms, hands, and legs; these six parts allow seven points of articulation: swivel head, swivel arms, swivel wrists, and swivel legs. Minifigures are usually packaged as four separate parts in Lego sets: head; torso, arms and hands; headgear; hips and legs.
Minifigure heads are cylindrical, and attach to a long, narrow cylinder molded onto the top of the torso, which allows the head to rotate. This feature also allows items to be attached to the figures over the torso, such as air tanks, capes or breastplates. The heads have a stud on top which is the same size as studs on standard Lego bricks which could allow one to be placed on it. Head accessories vary widely, and include hair, helmets and hats. The legs rotate independently to 90 degrees forward, and nearly 45 degrees backward. Minifigures also connect to standard Lego bricks in both a sitting or standing position. The hands of a minifigure resemble the letter C, which allows them to hold many Lego accessories. There are hundreds of different accessories, including swords, axes, wands, cups, guns, and, in the instance of Star Wars minifigures, lightsabers and blasters. Additionally the tops of the hands are approximately the same size as the studs on standard Lego bricks, which allows Lego pieces to be placed on top of them. These variations allow minifigures to be customized, keeping with the modular design of Lego elements.
In 2001 Lego further expanded the minifigure system, with the introduction of Bionicle figures. These figures are a part of a fictional story developed by Lego, and resemble biomechanical creatures. Initially, these figures were produced without articulation, only able to hold tools and weapons.
In 2003, the first minifigures with naturalistic skin tones (as opposed to the yellow used until this point) were released, as part of the Lego Basketball theme; these minifigures were also created in the likeness of living people. The following year, the use of natural skin tones was expanded to all licensed products; in which figures were created to represent film actors and other living people. Popular examples include Star Wars and Harry Potter minifigures.