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Ditto is very clearly based on the Skinwalker of Navajo myth, a type of shapeshifting witch that can copy the appearance and basic behavior of any animal they see at will. Skinwalkers are often reported as having imperfect transformations, occasionally including a deformed face, which perfectly explains Ditto's face not changing when using Transform in the anime.
This may imply that Ditto is truly human, as Navajo witches themselves are humans that gain their status by breaking social and moral taboos of varying degrees of intensity. For a high ranking Skinwalker, this may include murder of immediate family, necrophilia, and incest.
Become a Ditto today, your sister will understand.
