Haven’t been following LOTF2 so massive grain of salt but:
In LOTF1, your class actually had a very strong impact on gameplay. It defined your magic which boiled down to buff, direct damage, and an ult. I THINK you could change that on an NG+ cycle but it has been a minute.
Since it is a different dev team and a more modern game, I assume it is closer to Remnant or Code Vein (aka “Sexy goth anime vampires”) where it is an equip slot that impacts stats and spells but you can more easily swap it out.