Your main weapon (and magic) depends on the mentor you get. There are opportunities to train with different weapons/learn different magic later on, but you'll always keep your favoured weapon.
If you want to get a sword, you can get a sword and shield from Chev Minne, or a rapier from Sir Asperame. Let me know if you explicitly want to know what choices you need to pick for that.
Oh I'd love to know what choices I need to make for both of those. So far I've been making calm and stoic choices and I'm curious to see how different I should play to get other mentors, so if it's no trouble I'd appreciate a little guiding, both for weapons and magic, which I'm sure some other people might find useful.
Just a question though, will I still get the chance to play as a stoic character while having other NPC's acknowledge that, or will I be stuck with whatever personally my choices before the timeskip give me, both for inner monologue and in other characters' minds?
Regarding your question, the MC's personality can change throughout the entirety of the story, you're never locked into only one set of personality traits. Though of course if you have an overwhelming amount of points leaning towards 'stoic', it might take quite a few decisions that go against that before it leans more towards 'emotional'.
I'll keep this guide as brief and spoiler free as possible. There are four possible mentors:
Lady Westwale: She'll teach you how to use a spear, as well as water divination. To impress her, you should 1) observe and remain silent, 2) express that your ideal knight is calm, 3) work together, and 4) remain steadfast.
Sir Asperame: He'll teach you how to use a rapier, as well as fire magic. To impress him, you should 1) volunteer to go first, 2) express that your ideal knight is passionate, 3) work together, and 4) forget dodging.
Chev Minne: They'll teach you how to use a sword and shield, as well as healing magic. To impress them, you should 1) observe and remain silent, 2) express that your ideal knight is tough, 3) work alone, and 4) remain steadfast.
Sir Stahlvart: He'll teach you how to use twin daggers, as well as illusion magic. To impress him, you should 1) volunteer to go first, 2) express that your ideal knight is flexible, 3) work alone, and 4) forget dodging.
The second choice is the most important one.
