Hi Fx, going to need a little more contex for this.
1. Is all the dialog in the game dialog bubbles?
- If this is ture, then the easiest way is to see if the game is using Yanfly's Message Core, as you'll be able to edit the size within this simple plugin.
2. Are the dialog bubbles actually handled by the "dialog" function or are they images within the character sheets?
- This would involve editing every image in an image editor, could be very tedious.