Marvel Chronology Project

Atlantean villagers
Atlantean bandits
Sweet Mercy
Captain Kharsa
Sycorax
Garanna the Breaker
The Mountain
Dorma
Ambrose
Namor the Sub-Mariner
Attuma
an Eldritch sea creature
an Atlantean Imperial Detachment
Great Old Ones from the Outer Dark in FB
creatures of R'Lyeh in FB
ancient Atlanteans in FB
Guards of the Unforgotten Stone in FB
citizens of Murmansk
Madame Lillian von Loont
Baron Wolfgang von Strucker
Baron Karl Mordo
Nikolai Kravinoff
Director Vazhin
Russian scientists including Bezukhov

Belatedly:

Lillian van Loont is Alpha Flight foe Gilded Lily
Bezukhov is likely intended to be Ivan Petrovich Bezukhov

Both have chronologies on the site.

Also, while I'm sure the writer intended Mordo to be Karl, given that we know from Doctor Strange, Sorcerer Supreme#6/2 that Karl was born in 1921, making him more or less the same age as Namor, who is in his early teens in KiB: Namor#2, the adult being called Mordo can't be Karl. And since the same DSSS story showed that Karl's dad died when Karl was fairly young, it might be tricky for it to be Nikolai Mordo either. It might feasibly be Nikolai in KiB IF (a) the story takes place circa 1931 say, and (b) 11 year old Namor looked old for his years (feasible - we don't know how fast Atlanteans mature), and (c) Karl Mordo was about 10 when Nikolai died and just looked young for his age.

Here's Karl at the time Nikolai died: