img019 (4th/5th panel)
=> I'd use past simple for the whole sentence, so I'd change the middle past to "there were many who trained".
img022 (1st panel)
=> Hypothetically is hy-po-thet-i-cal-ly. I know that it's a small bubble and breaking a single word mare than once doesn't look good (that's just my opinion), but you can use a smaller font or use a synonym like "theoretically" or "for example".
img023 (5th/6th panel)
=> same issue as above.
img024 (3rd panel)
=> In the 1st double bubble I'd more "for you" to the end of the sentence.
img024 (4th/5th panel)
=> I'd use "allows" instead of "allowed".
img025 (5th panel)
=> I'd use an article, so "within the tengu society".
img034 (3rd panel)
=> Not saying that it's wrong, just that in the 1st double box I'd either use "wielding Hakurouken" or "using Hakurouken's power".
img035 (4th panel)
=> In the 2nd double bubble shouldn't it be "turn her blade against her mistress"?
img039 (3rd panel)
=> Reasonable is rea-son-a-ble.
=> Absolutely is ab-so-lute-ly. I know that the box is narrow, so why not use a smaller font size or a synonym.
img051 (4th panel)
=> Resolution is res-o-lu-tion.
I didn't read the afterword, sorry, but I don't really care about it in general.