So why is he considered a mutant?
Is it really a mutation or can another human/Atlantean hybrid develop the same heel wings?
Did his father carry the X-gene? If it was Namor's mother then does that mean there are a minority population of mutant Atlantean?
What Namor comics you recommend? I read his Silver Age appearances, some collected Golden Age stories and a few of John Bryne's run. I read Illuminati as well.
It's meant to be "this is the first mutant character Marvel ever published" as opposed to "first mutant in the Marvel Universe" As far as I know, the Golden Age Angel and Ka-Zar aren't mutants.
When Namor got his ongoing around the late 80's or early 90's they just put the "first mutant" tagline because the X-Men were popular. And then decades later they had that series called Namor: The First Mutant.
Supposedly Universal, actually. I don't know how that happened. So it might be a situation similar to Hulk in that they might just introduce Namor into a movie or TV show as opposed to his own thing.
In a word, branding.
Back in the 90s the X-Men were the flagship Marvel title. Highest profile, highest selling, all that jazz. So when they tried to do a high profile Namor relaunch by John Byrne they stuck a big old "MARVEL'S First Mutant" on the cover to try and boost sales. Mutants sold, so now Namor was a mutant, deal with it.
These days mutants aren't as hot a brand, but the in-universe designation has stuck around. Much like how the effects of the current inhuman rebranding is going to linger for a long time.
>there are a minority population of mutant Atlantean
Actually, there was a Submariner story from the 70s that dealt with a band of nomadic Mer-mutants.
He is the first known mutant, the first Avenger and a genius and a scholar
Totally wants to "IMPERIUS SEX" her.