He self-identified as Queen of Egypt.
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"The most recently suggested possibility for Akhenaten's supposed pathology is a genetic disorder known as Marfan's Syndrome. This is a more likely possibility than Froehlich's Syndrome, as it does not affect intelligence or fertility (Burridge, A., 1995), (Redford, D., 1994).
Marfan's Syndrome was first described by a French doctor named Antione B. Marfan, who reported that some of his patients had especially long fingers (he called this arachnodactyly, or spider-fingers), skeletal abnormalities (including arms that were disproportionately long), and high, arched pallets. He also noticed spine defects (Wieczorek, Riegel, & Quattro, 1996).
Antione noted that these traits seemed to be inherited, and it is now certain that Marfan's Syndrome is a hereditary disease, and the gene for it is autosomal dominant (Wieczorek, Riegel, & Quattro, 1996)."
(snip)
I won't speculate that he was an alien, but...
They keep referring to Akhenaton as a Monotheist. He was not. A monotheist believes in one God. Akhenaton did not deny the existence of other gods. He just felt the Aten, the sun, was the only god that should be worshiped. His theories were as much political as religious since he opposed the powerful priesthood of Amun who controlled an extensive amount of wealth and power.