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.