"Hey, Kazuma," she muffled into the dirt as he trudged up the hill to carry her. "Did the explosion look... more 'fiendishly' majestic today?"

It’s a very cool subversion of the usual "heavy metal" Tiefling trope.

Wizard (School of Evocation). This allows you to maximize your damage and eventually "Sculpt Spells" so you don't blow up your party members (though the real Megumin might not care).

The blast wasn't just a fireball. It was a vacuum-sealed rupture of the atmosphere. The shockwave rippled through the clouds, clearing the sky for miles and leaving a lingering scent of ozone and singed hellfire.

If you’re looking to bring this character to the tabletop, the mechanics are surprisingly synergistic: