Each character has their dialogue outline defined to 1, I changed every character to 3 instead.Thank you very much. What did you change may i ask?
It's because since the game has a dark textbox, I thought it would look strange with a thick outline, but I didn't think about people playing without the textbox... My bad.
But having a better look now, it looks better with the dark textbox too, I may let the outline this way!
I'm glad I could help you!