Honestly I would've changed the Justice League line up by now, kicking him off the team already. My favorite JL teams don't contain him and I prefer him with just him and Mera hanging out.
Aquaman is an 'adventure hero' first and 'superhero' second.
He debuted at a time when comics were equally about adventure stories as they were crime, horror or superhero.
By the time of JLA's debut, he was still predominantly an adventure hero, and fit in the team about the same as Wonder Woman and Martian Manhunter, both of which were less superhero-ish than they became in the '70s and '80s.
I think the struggles the character has been through is just his being adapted to the change in comics, especially with the Big Two, into a superhero-centric focus, which makes him appear less interesting due to not having flashy powers (pardon the pun).
The 'age of wonder' and 'thrill of adventure' days have come to an end (at least for now) and we're in a more of a 'neo-mythological might and power soap-opera' era where even supporting cast members are somewhat shunned in favor of an inclusive storytelling style, similar to pro-wrestling (for example, relationships are more likely to develop between two superheroes than between a super and a non-super).
Characters are rated by power-levels and costumes, and less by personality or personal narrative.
Where does that leave Aquaman?
Well, he's become essentially the 'school outcast' because the shift in focus has pushed him even further down the totem pole.
He works best as an adventure hero, dealing with a fantasy/sci-fi underwater kingdom with mythological lore and the challenge of belonging to two different worlds.
Pretty much like Wonder Woman, his abilities always came second to diplomacy, adventure, royalty drama and dealing with a foreign culture.
And like Wonder Woman (and Hawkman), he's been subjected to the 'how do we make him/her cooler?' and given weapons and armor to make him seem more exciting to modern readers.
As for why he's in the League?
First, because he was grandfathered in by being there in the '60s.
Second, because Johns likes the character. Or he would've simply been replaced, like J'onn was with Cyborg.
He does still have potential as being a diplomatic emissary for the underwater kingdom.
More so, when you consider that over 70% of the Earth is covered with water, which means there could be twice as many cultures and people living underwater, even under the crust, than there are above when you think about it.
How many metropolitan cities can you name?
How many underwater metropolitan cities can you name?
"There's magic in the sound of analog audio." - CNET.
In 1960, there were only five super-heroes with their own books, when the Justice League was created. That was Superman, Batman and Wonder Woman who had survived the great die off of 1950--plus the Flash who had just got his own title and Green Lantern, who hadn't yet got his own title but soon would in that year.
There were four other super-heroes (if you don't count Congo Bill or Adam Strange) that had their own regular features in anthology books. Those were Supergirl in ACTION COMICS, Aquaman in ADVENTURE COMICS, Martian Manhunter in DETECTIVE COMICS and Green Arrow in WORLD'S FINEST COMICS.
So Aquaman and Martian Manhunter were selected to fill out the membership, to make it seven. Although, Mort Weisinger and Jack Schiff wouldn't let editor Julius Schwartz use Superman and Batman full time in the League--so it was really a five member team for a little while. Aquaman came from a Weisinger edited comic and Martian Manhunter came from a Schiff edited comic--so those editors did allow Schwatz to use two of their characters full time.
Aquaman can already do almost every single one of those, barring the regeneration. Plus other powers that don't get brought up often enough- like the ability to withstand extreme temperatures on both sides of the thermometer.
It sounds like you're basically wanting to strip the character of what makes him unique and just make him his powers. That's a pretty big mistake, IMO.
Aquaman is an amazing character. Great powers. King of a vast kingdom. A kingdom hidden to most of us. I don't get the objection to Atlantis existing in a Fictional Universe. But I grew up with Aquaman pre Super Friends. I like both him & Namor.
Why Aquaman? Because Aquaman is awesome! That's why. sharks.jpg
There's a Time For Peace, and Then There's a Time To Punch Nazi Scumbags in the Face!!
It's selling better than Batgirl, Deathstroke, and several other DC books at the moment so it looks like Aquaman is here to stay.
And he should, because he's the underdog hero of the DCU. A unique and powerful character with a rich history and many interesting traits, who just can't get the respect he deserves compared to other heroes. He gets disproportionately mocked and ignored by both fans and non-fans even though he's earned his place as an A-list hero. Underdog status is something a lot of us can respect, and it's why I'll always pick up his book even when it's not the most amazing thing on the shelves.
Aquaman has physicals on.par with demi gods,awesome tech,great magic,armies of superhuman and undersea animals that follow his every command,world governing power.
Nobody can touch him,his stack is higher and deeper than anybody elses
Though much is taken, much abides; and though
We are not now that strength which in old days
Moved earth and heaven, that which we are, we are,
One equal temper of heroic hearts,
Made weak by time and fate, but strong in will
To strive, to seek, to find, and not to yield.
--Lord Alfred Tennyson--