Namor the Sub-Mariner (aka Namor McKenzie) first appeared in Marvel Comics #1, 1939. The character was created by Bill Everett, intended for another magazine Motion Picture Funnies Weekly due for publication but was unreleased in the end.
Namor was born in the capital city of the initially unnamed Atlantean empire, then located off the Antarctic coast. His mother was Emperor Thakorr's daughter, Fen, and his father an American sea captain, Leonard McKenzie, of the icebreaker Oracle; they had fallen in love and married aboard ship while she was, unbeknownst to him, spying on the human intruders. When Fen did not return, Atlantean warriors attacked the Oracle, evidently killing McKenzie, and returned Fen to her kingdom. The pink-skinned mutant Namor was subsequently born among the blue-skinned Atlanteans. He became the Prince of Atlantis, and a warrior for his people against the "surface-dwellers".
Through his life till now, Namor has joined force or literally enrolled into several superhero groups. And that, starting with the group formed against the Axis force during WWII - The Invaders, a later time with The Defenders, and then The Avengers briefly. The proud prince has also made collaboration with the X-Men on several accounts. He was even revealed as a member to the exclusive and mysterious group Illuminati.
Being one who walks the surface world and able to venture deep into the ocean, the dashing Mariner has quite of history of love life too.
After losing his memory for a while post-WWII, he got tremendously infatuated with Sue Storm, only to find out that her heart had been occupied by another.
When returned to his sea throne, he almost immediately married his cousin, Lady Dorma, whom was kidnapped and presumably killed by his royal enemies.
During his stint with the Avengers, he tied the knot with Marrina, female oceanic alient member from another superhero group Alpha Flight. And recent years, he was (perhaps) enchanted (perhaps), caught in a twisted mind (perhaps), had a little something-something with Emma Frost? (tee hee)
Namor's role in the Marvel Universe is irreplaceable. He represents a culture and race that is unlike the common population of mankind. One that is somewhat more superior than us, with a greater history than us, one that we fear would come true one day in our planet's history. Which led to so many fictional Extraterrestrial talks in our literature, preparing us for that day to come.
He is the King, the Leader, the Supreme of that alien kind. And if that day ever come, perhaps we hope he would be Namor, the first mutant known to man.