I’ve read stuff about “the Void” from the comics & looked up what it might b.Like how it’s Reynolds real personality,his “superhumanity” having eroded his humanity leading to a “void” in his life, a normal division btw good & bad in any normal person,a “mind virus” originally put in by Mastermind or from Norman Osbourne said in Siege #4 & is something similar 2 what the Sentry’ wife Lindy might have been getting at “the Angel of death” .The fact that it’s more powerful in the “Negative zone” kind o’tells u something that might help but I cant think o’anything.
If he’s just really powerful you might have 2 get Mr.Fantastic's Ultimate nulliffier
People wise this might require Squirrel girl (seriously) since she’s supposedly taken out Baron Mordo,Korvac,Pluto,Thanos ,Terrax the tamer & Ego the living planet
Omega level mutants.I’m thinking
Franklin Richards( I don’t think reality manipulation is really one of “the Void’s) powers.Though I doubt R. Richards would agree 2 it
& mayb the High evolutionary
If “the Void’s” beyond them then I’m guessing you’d need heavy hitters on a cosmic scale.I’m thinking
the Impossible man (who might be able 2 copy “the Voids” abilities)
Galactus (in the “What if” story “the Void” destroys Earth like this certain planet eater)
,the Phoenix Force (unfortunately it might b hard 2 contact it)
the entities Eternity or Infinity,
the in betweener,
a Beyonder u could get on the good guy’s side
and maybe even the Living Tribunal if it gets 2b that bad.
But seeing as how the Watcher never appeared (I think) before or during the Siege to explain about “the Void” in the Sentry I don’t think it could go that far.If yer then man Marvel has some explaiing 2 do.
If it’s something else supernatural like say a demon (in which there some characters that can handle that I guess) but if it’s the “Angel of Death” [which I doubt it is] then…hmm…the only thing I could see that could remedy that is Angel from the X-men(supposedly a descendant of Cheyarafim,angelic like mutants) or the Spectre,Zauriel and possibly the Phantom Stranger (who might be an angel) from DC comics.If they were to encounter “the Void” then (if it is “the Angel of Death”) they would probably try to like communicate with it and then take it out Rob Reynolds.However if throw DC character u can like make another list with other characters like say Mr. Mxyzptlk.
You know if “the Void” was like cosmic scale powerful I’m kind o’surprised they did’nt have him around in “Chaos war”