Otherkin are mostly associated with Tumblr, due to many congregating there. People who identify as otherkin believe themselves to be different to who they are. Whether it be a mythical creature, an actual animal, or sometimes other people. It's common for those to claim to experience "phantom limbs," where they feel a limb (weather it be an arm, a leg, or a tail) even though it's not there. Often these people mimic behaviors and personality traits of whatever/whoever they believe themselves to be.