It's unclear to me if this falls under UniversalLanguageSelector per https://www.mediawiki.org/wiki/Extension:UniversalLanguageSelector#Adding_fonts (which includes steps how you could create a patch yourself which adds that font), or if this is SRE territory as per e.g. T180924 (though that's for fonts in SVG files). Which is one reason why I filed T228591.

Let's see if someone can handle this, as visitors are reading the text with Comic Sans (suboptimal solution). Thanks!

Change 625664 had a related patch set uploaded (by Reedy; owner: Reedy):
[mediawiki/extensions/UniversalLanguageSelector@master] Add GochiHand font

https://gerrit.wikimedia.org/r/625664

In T258839#6462213, @Reedy wrote:

https://github.com/huertatipografica/gochi-hand has been created and should be enough to mostly unblock this request

Patch is updated with woff and woff2 formats

woff and woff2 files upstreamed back via https://github.com/huertatipografica/gochi-hand/pull/1

Change 625664 merged by jenkins-bot:
[mediawiki/extensions/UniversalLanguageSelector@master] Add GochiHand font

https://gerrit.wikimedia.org/r/625664

In T258839#6666104, @Theklan wrote:

This is claimed as resolved, but I have tried various computers that don't have this font installed and the typeface shown is Comic sans. Is there a problem with css?

https://eu.wikipedia.org/wiki/MediaWiki:Common.css

Probably. It being in ULS doesn't make it magically get loaded

https://www.mediawiki.org/wiki/Universal_Language_Selector/WebFonts

I'm not quite sure on best practice, but you can use the URLs below to tell the browser where to find it, using @font-face etc; presumably like you did previously from tools

https://eu.wikipedia.org/w/extensions/UniversalLanguageSelector/data/fontrepo/fonts/GochiHand/GochiHand-Regular.woff
https://eu.wikipedia.org/w/extensions/UniversalLanguageSelector/data/fontrepo/fonts/GochiHand/GochiHand-Regular.woff2
https://eu.wikipedia.org/w/extensions/UniversalLanguageSelector/data/fontrepo/fonts/GochiHand/GochiHand-Regular.ttf

Untested:

@font-face {
  font-family: 'GochiHand';
  src: local('GochiHand') url(https://eu.wikipedia.org/w/extensions/UniversalLanguageSelector/data/fontrepo/fonts/GochiHand/GochiHand-Regular.woff2) format('woff2');
}

You will probably want the local() (to tell it to use the font locally if it exists

And the format() to give the browser the hint about the type...

https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face

Somehow, the local() wasn't working. So I get rid of it and now it is working. I have added woff2, woff and ttf formats. Thanks!