Depends on the versions, but generally Aquaman or Wonder Woman is the most redundant.
Aquaman's physical stats are exceeded by Superman and WW, and his telepathy isn't as good as J'onn's even if he doesn't turn in to a mewling child every time someone attacks him mentally. If they were fighting something with a massive army, or someone magical, and Aquaman had one of his more versatile tridents, then you could make an argument for him.
Diana, unless they're fighting gods or something, doesn't bring anything to the team bar diversity, though I'm not sure that's a bad thing. Her fighting skill is exceeded by Batman, and her magic weapons are generally equalled by Arthur's tridents.
Then there's Batman, as I'm sure someone else will say.
True but then there are times Arthur's TP has succeeded where Jonn's has failed. Not because its bertter per say but because it works differently. The Dimensional entity that Jonn couldnt even read for example but Arthur could TP dominate. MMH struggles telepathically vs most white martians but Arthur can just shit them down.
Again not saying I dissagree, I'm an AQ fan and I agree he's probably the most redundant.
Then it wouldnt have been accurate.
As you can see from the above posts, he’s an integral part of the duscussion.
I cant cherry pick the facts, based on character bias; pull a Carver so to speak.
Green Lantern is also kinda useless but he is strong.
Cyborg has the tech, which only Batman can really match
WonderWoman doesn't bring anything but a lasso
MM has his TP that no one can really replicate
Superman is the shield/hammer. No one can do it as good
Batman is the brains and plot devise
Flash is godly in speed and retcon. And he the strong member
REALLY
GL is like the most versatile member and as such the least redundant. He has a ring that can do anything he can think of. If there's anything the JLA needs to do that none of their powersets cover he's wearing the gap fill/answer/solve.
The water hand era sorta did for a while. Plus magic immunity, a link the the collective unconscious of man, dimensional travel etc.
Not that he wielded it much but so did posiedens trident pre 52. Yet after gifted it (IIRC for saving the sea god from Hades) he put it under armed guard in Atlantis and almost never carried or used it.
Superman is needed as the figurehead. Plus, his stats - stronger than everyone here, nearly as fast, etc etc.
Batman is needed for his resources (that JL satellite can't be paid on Clark's salary, and mythical Greek treasures can't be used as legal tender with the plumber). He is also there to 'think like a bad guy's.
Hal is....you need him for the cosmic adventures.
Aquaman? Water covers 70% of the world. He has a giant ass army. Access to magic. Some TP.
MM coordinates everyone, plus you need a Worf.
WW is the magical brick.
Cyborg is the tech brick.
Firstly, you need a running surface for Flash. So he's out of any space adventures. Superman is nearly as fast, to the point he's faster than others. Batman is a better forensics guy. Cyborg is a better supercomputer
Pfft. Heart has no place in it. Besides, isn't WW meant to be all about love? To the extent she got chosen for the Star Sapphires? Superman is the farmboy who's all about family values, etc.
They need someone with some knowledge of the 'real world', to me. I.e. if Luthor stages a corporate takeover, or some insidious business/political shenanigans. That's where Bats comes in. He's their link as well to the government, through Amanda Waller.
For all their 'humanness', Bats is the one guy who gives them a human face, more so than Barry, Hal or Cyborg. He's the reader, in essence.