Welcome to the Anime Walk of Fame, a series of retrospectives on the many characters of the anime world. You'll see all your favorites along with a few that deserve more than their reputations give.

So sit back relax and enjoy the show.

Aqua is Actually Brilliant, She's Just Lazy

Time to put to bed an old trope.

Aqua is the one who redeploys Kazuma into the new world but her arrogance and teasing get turned against her and she's dragged into the world to play the Isekai game, she still has her powers though which make her more useful than you think.
As her name suggests her affinity is water and her powers are mostly support and healing, in every world she's a useful asset but having been brought up in a domain that ultimately looks down on humanity, the goddess is too lazy to be useful and knows next to nothing about how RPGs work.
Aqua is far from useless but may as well be for her lack of empathy, any wonder she barely has any worshippers.

Darkness Would Never Survive in a Different World

I guess I'm doing the main four of Konosuba then.

Darkness is a high level knight in the world of Konosuba but for all her high stats her battle abilities are terrible.
But being a masochist, she takes pleasure from being beaten to the inch of her life, half the reason she joins Kazuma is his brutally honest way of speaking triggers her in a good way.
So having a tank is useful but in any other universe, she'd be dead by the end of the first dungeon.
Yes, I know, parody is part of it and at the very least she's more useful than Megumin and still hilarious to watch but I'm guessing no serious adventure groups want a death on their record which is why Darkness was never picked, bad for business and all that.

Megumin is Just a Discount Lina Inverse

This is a hot take that needs to be said really.

Megumin is a high ranking mage from the world of Konosuba, she has the power to level entire towns with a massive explosion, she has a complex about her body type and has an appearance that looks more like she's make believing she's a mage as she shares a basic design build of Chunnibyou characters right down to the eyepatch.
In reality she's a poor imitation of Lina Inverse, anime's most powerful mage and easily top ten most powerful anime characters of all time.
The effort it takes for Megumin to summon one explosion, Lina can casually cast Dragon Slave, an attack with the same destructive capabilities but way more powerful, just to rub it in, she can cast Explosion Array with no effort, a low level explosion attack for casually taking out bandits.
I get that the joke of Konosuba is that Megumin's powers are impractical for any fantasy party but her popularity is undeserved considering that older anime characters trump her in everything.
Still not convinced?
Lina Inverse's Giga Slave can wipe out the entire world if she fails to cast it properly, when she succeeds, all final bosses are instantly killed, the only side effect is being drained of Magical power.