Fabien Quatravaux

<a href="http://www.fontsquirrel.com/" rel="nofollow ugc">Font Squirrel</a> is your best resource for FREE, hand-picked, high-quality, commercial-use fonts. 
They provide a large part of their fonts in a web-embedding-ready way that is supported by all major browsers (@font-face CSS method).
The provided formats are : 
* TTF – Works in most browsers except IE and iPhone. 
* EOT – IE only. 
* WOFF – Compressed, emerging standard. 
* SVG – iPhone/iPad
They provide an API to list, preview and download fonts very easily : this unofficial plugin is using this official API.
When you browse fonts and dispplay one with this plugin, the font is downloaded from fontsquirrel.com. If you then choose to install the 
font, its css rule is put in the head section of you website pages so that you can use it on any page. The WordPress built-in editor 
(TinyMce) has a dropdown list that lets you choose the font you want for each part of your site.

Font Squirrel (unofficial)

Bring fonts from fontsquirrel.com into WordPress. Fonts kits are downloaded into your content directory and linked with @font-face.

raspi0124

Add Japanese font to Gutenberg and TinyMCE Advanced plugin’s font family selections. 
Now supports Gutenberg as option. Please enable gutenberg option in order to use it. 
Font to be added； 
<a href="http://hp.vector.co.jp/authors/VA039499/#hui" rel="nofollow ugc">ふい字</a> 
<a href="https://www.google.com/get/noto/#sans-jpan" rel="nofollow ugc">Noto Sans Japanese</a> 
<a href="http://tanukifont.com/esenapaj/" rel="nofollow ugc">エセナパJ</a> 
<a href="http://font.gloomy.jp/honoka-maru-gothic-dl.html" rel="nofollow ugc">ほのか丸ゴシック</a> 
and more.. 
And If you want more font,please post a comment to page below.
Please see <a href="https://diary.raspi0124.dev/post-677/" rel="nofollow ugc">here</a> for more infomation.(Japanese) 
Development for this plugin takes place at GitHub. To report bugs or feature requests, please use <a href="https://github.com/raspi0124/Japanese-font-for-TinyMCE" rel="nofollow ugc">Github</a> issues. 
This plugin could not be exist without the creator of the fonts, the people who sacrificed huge amount of their time contributing to more freeer world. 
If you would like to donate, or send message to those people who sacrificed huge amount of their private time making those fonts and pubishing them for free, feel free to checkout this list. It has all email/donating destination I could collect.

Japanese font for WordPress(Previously: Japanese Font for TinyMCE)

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Add Japanese font to Gutenberg and TinyMCE Advanced plugin's font family selections.

Font Squirrel (unofficial) vs Japanese font for WordPress(Previously: Japanese Font for TinyMCE)