My friend I'm not sure if I am the one who is colorblind but I see shiny tentacool as purple-ish gray.

It does a great effort to disrespect HxH and discard the original Nen system for something that is almost a stereotypical portrayal of chinese fantasy. Pros: OC name actually fits. Cons: Discarded Nen system. MC motivation does depend on breaking the 4th wall. USE OF GRAPHIC WRITTEN ELEMENT to portray emotion in place of actual description. Puff! I just did instant powerup thing because I'm in a hurry for some reason that is not explained. It's just bad and I really hope those positive reviews are from author's friends.

You could go for the actual power system of HxH, have your time developing meditation and then have your OC search for the portrayed ways to test Nen. This here is just another xianxia/wuxia (I don't care about the difference) in a popular anime setting. I know HxH might not be pleasant to you as the work contains several traditional japanese symbols but the "nen" part is all about buddhism so if you had a justified prejudice against japanese symbols you just discarded something that wasn't a japanese symbol.

Ikr, fics these days forget to follow the naming culture, like "He Caofeng" in western Marvel, a DC charater that has gender-neutral name when this aspect is way too recent, mixed culture - Yamanaka Bob - and names far too exotic for a main character.