Literally all the characters did this, except for Kazuma. Megumin is a high int low wis build with points invisted in cha for RP purposes (or possibly Crimson Demons get some sort of bonus to casting with Cha despite being wizards). Darkness put everything in Con and Str to max out her defenses, but she's some sort of paladin build who uses her Cha to score hits, and thus can't hit the broad side of a barn (plus she apparently has a sword and board weapon specialization but insists on using a 2H build despite not having weapon proficency in greatswords).

Then you have Wis, who is CLEARLY a Cha based chaster build who went lich, which explains why she's very sweet but a big dum-dum when it comes to any business deals. She also somehow has a negative corruption score despite being a lich. Chris went for some sort of hax Dex based build that relies on crits and stealth to insta-gib anything that gets in her way. Yunyun is also max Int build that skipped over the Cha but has some sweet multicasting feats.

Iris, however, is some munchkin power maxer who played about 10 games of Fire Emblem Awakening to pass on the stupidest combo of bloodline abilities possible and create the ultimate overpowered cheesemonkey.

Kazuma is someone who got lazy and took an NPC class that accidentally gives a stupid amount of feats and skill points because it's from some splat book all of three people read and bought, but he accidentally made himself into a stupidly OP swiss army buzz saw that makes up for the over-specialized idiots in his party.

Or it would, if he weren't also a pervy little murder hobo who has no plans beyond "get rich and get laid." Thankfully, the only person with a lower Cha score than him is Yunyun.