Sanosuke sagara

[Zepheri]

I'm trying to recreate sanosuke from samurai x
I think he started as a fighter brawler archetype so he can use the zampakto, and later he passed to create unchained monk to use the futae no Kiwani.
So my question is do I go all monk or brawler archetype up to lv 3 and then pass to monk
And the futae no Kiwani is a double hit I 1 hit how can I emulate this with the feat and special ability?

[JiaYou]

Mechanically, to wield the zanbato (zanpakuto is from Bleach I think) you'd want to go one level of Titan Fighter to wield a Large Greatsword or Nodachi for 3d6 or 2d8 damage respectively. Nodachi is the correct weapon thematically but the Greatsword does slightly better average damage. Then just go Unchained Monk. There's not REALLY a good reason to keep going with Fighter I'd argue. Futae no Kiwami could be emulated with the 5th-level Style Strike "Elbow Smash" (yes, I know it's not exactly the same thing, but you can restyle it as the Futae no Kiwami, especially if this is a home game).

There might be a way to get exactly the Futae no Kiwami (effectively a double strike off of one hit) other than like Vital Strike but I'm not 100% sure right now and don't have the time to do a detailed check. Good luck!