- Scorpion - Fawcett
- Destroyer - either way but mostly Fawcett
- Grimm Ghost - Charlton
- Son of Dracula - Fawcett
- Tiger man - Charlton
- Devil slayer- Fawcett
- Brute - Charlton
But that's just an un researched guess and really depends upon the creators
In the OTL, Howard Chaykin took Scorpion over to Marvel and redid the Character as Dominic Fortune .
Also the Demon Hunter was converted to Devil Slayer in the Marvel Universe.
I was going to suggest that Atlas Seaboard be part of Atlas/ Marvel.
But when I looked at the Characters that Atlas Seaboard came up with, I am really only able to see them as supporting characters.
A number of them would fit in nicely in the Marvel/Atlas Horror Comics like Tomb of Dracula and Werewolf by Night.'
The Cougar was a good idea for a Character with a Stuntman using his skills to fight Supernatural. It just suffered from being forced into a Superhero Mode .
But many of the Seaboard Characters are just copies of existing heroes.
The Brute is just a Hulk Clone.
Dragon is just a Master of Kung Fu clone.
Iron Jaw was a Conan Clone
Son of Dracula is just a Tomb of Dracula clone
and Devilina is just a clone of Satana Daughter of Satan.