Since today is the start of Divinity 2, I'll go ahead and say right away that I'm more interested in how his character will turn out rather than what character he'll make in the beginning. I bet he'll go back to a garbage balanced build that he utilizes in any other RPG of that type (look at CyberPunk2077, hell look at his Dark Souls and Nioh builds). Any kind of freedom is the bane of Dave's existence because he doesn't know how to play vidya so he doesn't know what strengths he should focus on (cuz he has none) so he ends up with a character who can only utilize all the skills and options the game has on offer poorly.
To put things into perspective from what I remember your starting class in DOS2 is akin to how it works in a game like Dark Souls, you could take an unga bunga class but then start dumping all your level ups into stats needed for sorcery and then just play a pure mage, theoretically, so in that sense your starting class only affects your starting stats and gear.
It's not like a classic CRPG like let's say Might and Magic where if you make a Knight he can never learn Self or Elemental magic, or if you pick a Mage he can never learn most weapon skills or Self magic, your options on level up are more limited so someone like Dave has less chance to fuck it up. Or how most JRPGs work where skill and stat growth is predetermined so basically all you get on level up is the game giving you bigger numbers, making it more or less impossible to fuck up, perfect for Dave.
RPGs with progression systems like DOS2 are the bane of his existence, which is why I'll be more interested in his playthrough when he's like 20 hours in, that's when all of it will start crumbling down and MUH BALANCED CHARACTER autism will kick in.