Main character is basically a useful idiot trope that goes along the flow, in ways that anyone in the same circumstances with decent foresight would immediately know to be crippling themselves or drastically increasing how long it would take for themselves to grow stronger. The main character also often makes poor decisions that are immediately obvious in their side effects and how said choices will force negative consequences onto him that he would not be able to handle. As an example: when he met then accepted his first master, it was obvious that the best course of action was actually to just drop out of that academy and go to a different one (the academy had clearly done the "testing" of him in a malicious way that would only be used if you are for deciding if someone is useful or if you should bother just immediately killing them)(I say this because he gave no indication that he was hiding anything to anyone at all involved in the school at the time it happened or even seeming at all after (including the military side of things)). Then ignoring that point: her first greeting was to make him think he was going to die, and by the description of her character after (upto chapter 1049) and during that event that she wasn't a good master material and had little regard for his actual well-being. After that time of "testing" him? Unless it made her look bad, she only treated him as an actual person after he was significantly stronger than her (to the point she didn't matter to him AT ALL as friend or foe).