Question

When I do insert-char (C-x 8 RET) I get lots of “no character” font displays, as when I seek characters matching “smil”. Can I fix this without rebuilding emacs?

Answer

Solved by following https://github.com/rolandwalker/unicode-fonts. Just put the .ttf files in my ~/.fonts dir, and where the repo links were broken I was able to download the font from google fonts. Didn’t even have to restart my emacs.

Thread

https://www.reddit.com/r/emacs/comments/ho3sy5/missing_font_for_insertcharacter_utf8_characters/