Changing the font of Japanese texts

[Ashitaka1]

For anyone interested, this Tampermonkey script forces Japanese text to use a specific font across all Bunpro pages. I had some trouble getting it to recognize a font already installed on my PC (HGSKyokashotai), but it seems to work well with Google Fonts. I’m sharing three presets for the fonts I’ve tried so far. As a fellow font lover, please let me know if you guys have any good font suggestions.

Option #1: Klee One Font

// ==UserScript==
// @name         Bunpro Klee One Font
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Forces Japanese text to Klee One across all Bunpro pages.
// @match        https://*.bunpro.jp/*
// @match        https://bunpro.jp/*
// @grant        GM_addStyle
// ==/UserScript==

(function() {
    'use strict';

    // 1. Inject Google Font stylesheet safely
    const link = document.createElement('link');
    link.href = 'https://fonts.googleapis.com/css2?family=Klee+One:wght@400;600&display=swap';
    link.rel = 'stylesheet';
    document.head.appendChild(link);

    // 2. Apply universal font fallback hierarchy
    GM_addStyle(`
        :root {
            --font-japanese: "Klee One", sans-serif !important;
            --japanese-font: "Klee One", sans-serif !important;
        }

        :not(i):not([class*="fa"]):not([class*="icon"]) {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Klee One", sans-serif !important;
        }
    `);
})();

Option #2: Zen Kurenaido Font

// ==UserScript==
// @name         Bunpro Zen Kurenaido Font
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Forces Japanese text to Zen Kurenaido across all Bunpro pages.
// @match        https://*.bunpro.jp/*
// @match        https://bunpro.jp/*
// @grant        GM_addStyle
// ==/UserScript==

(function() {
    'use strict';

    // 1. Inject Google Font stylesheet safely
    const link = document.createElement('link');
    link.href = 'https://fonts.googleapis.com/css2?family=Zen+Kurenaido&display=swap';
    link.rel = 'stylesheet';
    document.head.appendChild(link);

    // 2. Apply universal font fallback hierarchy
    GM_addStyle(`
        :root {
            --font-japanese: "Zen Kurenaido", sans-serif !important;
            --japanese-font: "Zen Kurenaido", sans-serif !important;
        }

        :not(i):not([class*="fa"]):not([class*="icon"]) {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Zen Kurenaido", sans-serif !important;
        }
    `);
})();

Option #3: Yuji Syuku Font

// ==UserScript==
// @name         Bunpro Yuji Syuku Font
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Forces Japanese text to a brush font across all Bunpro pages via font fallback.
// @match        https://*.bunpro.jp/*
// @match        https://bunpro.jp/*
// @grant        GM_addStyle
// ==/UserScript==

(function() {
    'use strict';

    // 1. Inject Google Font stylesheet safely into the document head
    const link = document.createElement('link');
    link.href = 'https://fonts.googleapis.com/css2?family=Yuji+Syuku&display=swap';
    link.rel = 'stylesheet';
    document.head.appendChild(link);

    // 2. Apply universal font fallback hierarchy
    GM_addStyle(`
        /* Override primary CSS variables if utilized by Bunpro components */
        :root {
            --font-japanese: "Yuji Syuku", "KouzanBrush", "HGGyoshotai", serif !important;
            --japanese-font: "Yuji Syuku", "KouzanBrush", "HGGyoshotai", serif !important;
        }

        /*
         * Cascade logic:
         * English text uses the system fonts (-apple-system, Roboto, etc.).
         * Japanese characters cascade down to "Yuji Syuku".
         * <i> tags and common icon classes are excluded to prevent icon rendering failures.
         */
        :not(i):not([class*="fa"]):not([class*="icon"]) {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Yuji Syuku", "KouzanBrush", "HGGyoshotai", sans-serif !important;
        }
    `);
})();