system
Given the following post, respond as if you're commenting on Reddit:
human
[DC Marvel] What would the Justice League think of Sentry ? Would they allow him to join the team or consider him far too dangerous ?

What would be Batman’s plan to take him down ?
gpt
Depends on which League we’re talking about, how long the Sentry has existed here in this universe, whether Sentry has yet revealed himself to the public, and whether or not one of his various mental breaks have been displayed to the world - and this is all to say nothing about his villainous alter-ego, the Void.

If the Void is revealed, that’s a major disqualifier. 

The Justice League of America is all about justice and creating public order, but without causing causalities. They’re assembled as super-powered police for world ending threats, but they try to stop any threats as peacefully as possible; Doomsday, Mongol, Darkseid etc don’t really count as they would literally blow up the Earth if they weren’t permanently stopped/ jailed securely). A Void-empowered Sentry casually tearing apart villains with his bare hands, or molecularly disassembling them because he feels that that upholds his vision of justice would clash with the more traditional views of the league.

If he can keep up a pleasant, light-hearted facade for the team, than all’s swell! Mind you this guy has crazy mood swings, and struggles with doubt. Thats his flaw. The League are supportive, and empathetic, but if you cross the no-kill rule, you’ve lost their support. 

In JLU, hell, anyone could join so long as they wanted to save people, and had (mostly) noble intentions. Look at the size of their register, over +100 members at one point. High-tier supes such as Sentry would be an A-class addition - assuming he hasn’t had any Void related moments in public.

Batman had a plan for each of the leaguers in the event they ever went rogue. If he has time to study the Void, and the Sentry, and Bob (his human form) he could simply manipulate him into submission via taking advantage of either persona, kidnapping Bob’s wife, or simply making the Sentry believe that he doesn’t exist anymore. (Good luck though, hahah he just comes back again later hahahahahahaahhahahhhrhdhdgdgdgdhshsh)