If you removed Font Changer but ended up with non-stock fonts (yes, this can sometimes happen even if you remove from the settings) here are a couple of things that you can do to restore them. Note that these options also apply if you got into any kind of bootloop after changing fonts.
1. You can flash your current ROM again. You won’t loose any data this way as a wipe isn’t required (check that your ROM doesn’t wipe automatically upon installation), but any themes and customisations which were applied to /system from inside recovery will be lost. On the bright side, you will have the original fonts back.
2. Flash one of the following zip files from recovery:
Stock Android 2.x
Stock Android 3.x
Stock Android 4.x
If you are an experienced user you may extract the fonts from those zip files and copy them to /system/fonts/ using ADB or a file manager (make sure to mount the system partition as r/w).
If any of these doesn’t help please email me at email@example.com.