☀️ Arselia and Akonia

I shouldn't have +2 OD for Chadear with persuasion, or is it not how it works?

It should, I miscalculated. I'll fix it now.

Are the stats for weapons with bonuses calculated correctly? Does the samurai bonus apply to the wakizashi? Does Might work with it?

Only the weapon's damage is indicated on the weapon. Your attack is multiplied by this percentage, i.e., you get 150*60%=90 damage. 100 (magic power)*100%=+100 dark damage.
The wakizashi works with the samurai but not with Might.