Categories 2-10
These Undead are of Categories 2 to 10, most unable to speak like humans. Only 22 of the 36 Undead made physical appearances in the series.
Read more about this topic: Undead (Kamen Rider)
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“all the categories which we employ to describe conscious mental acts, such as ideas, purposes, resolutions, and so on, can be applied to ... these latent states.”
—Sigmund Freud (1856–1939)