Originally Posted by
Ascended
Not reading all the pages but....
If we're going with raw historical importance, it's gotta be Ollie, Canary, Nightwing, Zee, Hawkman/Hawkwoman, or Atom.
Of those, I think either Zee or Atom make the most sense. They have unique (high end) powers, bring unique locations and story elements to the table, and have skills, talents, and personalities that enrich the established cast. Everyone else is absolutely great and are awesome enough to deserve full time League membership, but for one reason or another I don't think they bring enough new/unique elements to the table.
But if we look at things from a slightly wider perspective I think we also have to consider Black Lightning, Vixen, Cyborg, or Shazam (Mary or Billy, or perhaps you could rotate various Shazamily members in and out, it's a versatile IP). These guys all have unique powers and skills, interesting personalities, long histories, and plenty of nerd cred. Of these guys, I think you gotta look closest at Vixen and Cyborg, honestly. Shazam is great and has the strongest pedigree (and rogues gallery), but is too similar to Clark and Diana in terms of ability and subgenre, and Lightning is too close to the same kind of street level/pulp stuff that Bruce already provides. But Vixen brings magic and an African pantheon with her, and Vic brings both cyberpunk aesthetics and New Gods connections. Mari is connected to an industry and lifestyle the other Leaguers aren't, and Vic (as a former Titan) brings the element of generational heroism with him in much the same way Wally used to.
If I had to pick just one hero? I guess it's gonna be Vixen. But honestly, the League is where the A-list go to hang out, it's not the place that creates A-listers (even characters who *should* be A-list but aren't) so I don't believe you can just add someone to the Big 7 and have it be anything other than lip service. If we were dealing with raw A-list status (or as close to it as anyone outside the Big 7 gets) we'd have to be talking about Deathstroke and Harley Quinn, and nobody wants those guys on the Justice League.