The Abyssal Hunters are identical to Claymores in the manga series of its namesake, in which they are hybrid supersoldiers bearing the bloodline of a creature they are fighting against.
With the exceptions of Andreana and Skadi, members of the Abyssal Hunters are the only characters whose weight are listed in their Archives (albeit unknown).
In addition, Gladiia and Skadi are the only characters whose physical strength is rated as simply "■■" (likely denoting that the value is immeasurable).
In the beta version of Arknights, Blue Poison was listed as a member of the Abyssal Hunters.