Throughout the cosmos of comics, there is a concept whose inception into wide-spread acceptance took place in a tale entitled "Flash of Two Worlds" in Sept. 1961's Flash #123. Of parallel Earths existing side-by-side with counterparts that are very similar, somewhat similar or only tangentially so.
Mallo attests to something later explained by Roy Thomas himself, that there is an inherent energy...a force...manifested by super powered beings that operates in a parallel manner with subsequent counterparts on a different dimensional plane. We shall present lists of heroes that qualify under this and let you determine if in face they meet the multi-point criteria we shall offer for you consumption.
To illustrate, in the next several weeks we shall offer several examples of heroes, villains, groups and supporting characters who merit consideration under this assumption of parallel worlds-parallel people. We await your feedback on these compilations. Thank you.