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Doppelgängers are mental parasites that exist within The Realm of Time. Due to their realm having a complete lack of time, they are all in a newborn state. Their memories and knowledge come entirely from travelers passing through that they latch onto, generally replacing the host consciousness. They are single-cellular-sized while exhibiting shape-shifting qualities.
They exist in a single frame of time. They have no history.
Typhon was a Doppelgänger throughout THE TEMPORAL COURSE. The Mighty Pickle then swapped bodies with him in A NEW EVIL AWAKENS and became one through THE GAME and THE SHAPESHIFTERS ARRIVE before dying in THE DAWN OF A NEW DAY.
(random list of facts, inspirations, non-canon info, or things cut by the original author that relate to the entry)