Which principle of anmiation deals with imparting a unique identity to the animated character

Animation is a complex form of art.  Depending on the style (Realistic, Cartoony, Simplified, etc.), and depending on the medium (3D, 2D, Stop Motion, etc.), there are many techniques, rules and guidelines that an animator must follow.  However, regardless of the style or medium, there are 12 basic principles of animation that always hold true.  These 12 principles were established by Disney’s infamous “Old Men” in the 1930’s, and are still universally regarded as the standards for quality animation today.

photography had emerged as an elite art pursued by a few creative individuals for a few wealthy patrons. but now, said bauldelaire, it was succumbing to "the great industrial madness of our times." it was becoming a mass production industry that catered to middle-class tastes, including a taste for gadgetry. the stereoscope, the first 3d imaging system, had turned looking at photographs into parlor entertainment. a "thousand hungry eyes were bending over the peepholes of the stereoscope as though they were the attic-windows of the infinite.