I feel like this is a bit similar to those D&D derivative games where you have your characters start as one class and then you reach a growth plateau and can branch into (or are forced into) the next level of class, with some being more traditional and some being weirder. Like you start as Fighter and could swap to Knight, Barbarian, or Hunter, and from there split further to Paladin, Dark Knight, Spell Blade, Berserker, Ranger, Dragoon, Armiger etc.
I feel like I'm watching first, second, and third order classes battle for martial supremacy by virtue of being either further advanced or by being on a better/preferred track but untested.
(Dark Knight hero ftw)