Masters Of The Universe was conceptualized and developed in 1980 and pitched to Mattel executives by Roger Sweet in late 1980 two years prior to the release of Universal Pictures Conan the Barbarian in 1982. The toyline was produced starting in 1981 and marketed in 1982. The toy line existed prior to the movie and Mattel did not have a license with Universal to make toys for that film. He-Man was conceptualized as a barbarian, soldier, and spaceman with executives picking the barbarian out of the three to be the basis of the toyline. Likely the Masters of the Universe toyline borrowed heavily from Conan concepts but was not intended to be a toyline for the film after those talks fell through and the agreements were dissolved.
He-Man was conceptualized in drawings and wax sculptures. Some of these conceptual renderings do resemble Conan from comic books and paperbacks as some of the artists were inspired by fantasy artists Frank Frazetta and Boris Vallejo from the covers of the Lancer and Ace Conan publications, and some of the artists that Mattel employed to design the mini-comics, figure packaging, and box art were comic book artists who worked with Marvel on the Conan The Barbarian comic book such as Alfredo Alcala who inked illustrations by John Buscema in the #137 August 1982 issue, and later inked many others and illustrated #225. Earl Norem illustrated Masters of the Universe posters, package inlays, and box art. Earl Norem also illustrated Savage Sword of Conan #74 November 1983 issue, he later went on to do multiple covers for Marvel's Conan Saga and The Savage Sword of Conan.
Vikor looks like a twin brother of the Conan depicted on Savage Sword #10 by Boris Vallejo, similar to the Frazetta Conan with a helmet you used as a forum icon and also similar to the Conan with a horned helmet by Windsor Smith.
Why do you say "Norem also illustrated Savage Sword of Conan #74 November 1983 issue and later etc etc" ???
Norem illustrated Conan for Marvel's Savage Sword ...in Savage Sword of Conan # 14 ...in SEPTEMBER 1976 for the first time, and not in 1983 with issue #74 which is almost a decade later!!
Boris' cover for #10 was released in FEBRUARY 1976.
The (ridiculous ) results of the legal dispute between Marvel and Mattel were and are still available online , and your conclusions seem to correlate with them, pointing out material by Marvel drawn AFTER 1981-1982, while we Conan fans all know that Vikor's and He-man's graphic portrayals were more than heavily inspired by Conan (and Kazar as many have noticed also, especially concerning the sabertooth pet and the hero being blond), not to speak of the concepts ripped off from Kull (snakemen, skullfaced wizard archnemesis, hero being a monarch , etc).
Mattel did poorly in terms of originality, that's for sure.