Who were the two first marvel characters?

Timely Publication's first publication was titled 'Marvel Comics' #1 in October of 1939 and contained the first appearance of Carl Burgos' Android superhero, the Human Torch(different from the Fantastic Four member who debuted 20+ years later), and the first generally available appearance of Bill Everett's anti-hero Namor the Sub-Mariner, as well as Ka-Zar, the original Angel, and a few others.

Those are probably the ones you're looking for, from the "golden age" of marvel comics.

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Keep in mind, however, that the first comic published under the Marvel Comics "logo", or brand-name/company-imprint, etc) was 'Amazing Adventures' #3 in August of 1961 and featured Dr.Droom, who would later be known as Dr.Druid(and is here trained by the same sorcerer that would later train Dr.Strange).

Considering that Spider-Man didn't debut until issue #15 of this series(after it had become 'Amazing Fantasy'), and that the Fantastic Four didn't appear until their own debut in November of 1961, this makes Dr.Druid the first *official* Marvel hero(disregarding, of course, any in-story histories that establish Captain America or Nick Fury or King Arthur or Wolverine or the Olympian Gods or the Eternals, etc, etc, etc, as characters or super-heroes who existed *prior* to the publication of these issues in "our world").