Hi David! I was asking this same question several years ago, and the only answer ultimately is to bypass the blur on fonts - it can't be removed.
To get rid of font blur, you have to use the Victor Engine SFont plugin: https://victorenginescripts.wordpress.com/rpg-maker-mv/sfont/
This uses an image instead of a font file, and bypasses RPG Maker MV's horrible hard-coded aliasing. Essentially, it will replace your fonts with SFonts, and while it takes a bit of time to set up and create the required files, it will remove all of the blur. This is, as far as I know, the only way to remove the blurring effect.
If you're asking about the general blur that's applied to RPG Maker MV, you can also check out this thread here: https://forums.rpgmakerweb.com/index.php?threads/how-to-remove-blur.47504/
I used the excellent code that KisaiTenshi created to remove blur on the characters, tiles, etc.
Hope some of that helps =D