There are a few reasons why some fonts don’t show up in Illustrator. One reason is that Illustrator doesn’t support vector illustrations. If you want to create a font using vector illustrations, you’ll need to use another program such as Inkscape or GIMP. Another reason is that Illustrator doesn’t support the same font formats as other programs. For example, if you want to create a font using Unicode characters, you’ll need to use another program such as Adobe Photoshop or Microsoft Word.
