From a purist standpoint I'd say not. However, it is very possible to create thought forms (projections) on the astral and so a being would be able to place a fictional character in the astral (see separate discussion about making things permanent).
That being said, the very same techniques used for travel to the Astral and RTZ can take one to many types of places (planes) including wholly fabricated places. Creating one would require a fair amount of effort from many beings, but is quite doable.
Sin nada (Nothing is impossible)
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