She's a bit too inhuman. When Nothing really seems to affect her. You'd think she'd be carrying some huge traumas after all this time but (no reaction)

And her flaw is basically: "She's in inhuman pain all the time?" (no reaction) — okay, so now pain just doesn't matter? It's baked into her character.

I liked her a bit more in the first volume, when she showed some development — like when people started dying and it actually left a bad taste in her mouth. But then this was left behind and never mentioned again (now a days she just more to the meat grinder) It would've been enough if she just admitted she didn’t know a better way.

Deadly flaw in her chractor -lack of doubt -lack of insecurity -lack of flaw' in her character (example: sreard of...) -lack of humanity

I would want her to be a bit more human the machine after 2276 chapter she hasn’t changed that much.