To get the most out of Jitai (字体): The font randomizer that fits - #2 by Auroden, make sure you download the additional fonts on that page!
To use the fonts, all you have to do is download them, extract them, then double-click them and you should be able to hit an “install” button. I especially love ArmedBanana, even though I had to download another program just to be able to extract it. I enjoy this script so much that I actually modified it to exclude the more “vanilla” default fonts entirely, like this:
Notice the red circle; the double backslashes make those lines into comments instead of real code, so those fonts are no longer being loaded by Jitai. I’m not on OSX or Linux so those other default fonts already don’t do anything.
Just be aware that if the author updates this script, these backslashes are going to get overwritten and you’ll have to add them back in. If you start seeing vanilla fonts again, that’s why, but it’s only happened to me once so far.