You can use B.Y.T.E., a text editor made by BTD6_maker. Python 3 must be installed on your computer in order to use this tool.
How can I edit the YI font itself?
The easiest way is to edit a copy of the font.bin file included with the SMW2 Font Expansion patch, and insert the patch to use your modified font. The width of each character is also editable within the .asm file. If you change the name of font.bin, make sure to also change the incbin font.bin line within the .asm file to the new font name.
To display the tiles correctly in YY-CHR, change the Format to 1BPP and the Pattern to Vertical. You won't be able to scroll with the scroll bar while this is in effect, but you can still scroll using the ADDR0x80 button.
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