Similar Feature as Return YouTube Comment Username [aka YouTubeコメント欄の名前を元に戻す], but completely different implementation
Full Compatible with ALL UserScripts, Plugins, and Extensions
Full Compatible with TamperMonkey, ViolentMonkey, FireMonkey
Support Mentions inside Comments
Minimum Browser Versions:

Restore YouTube Username from Handle to Custom
This user script, named "Restore YouTube Username from Handle to Custom," is designed to restore the traditional custom name on YouTube. It aims to replace the handle-based usernames with the custom usernames that were previously used on the platform.
Description
The script utilizes the Tampermonkey extension and runs on the YouTube website. It fetches the necessary data to restore the custom username and replaces the handle-based usernames displayed on the page.
Author
This user script is developed by CY Fung.
Compatibility
The script is compatible with the YouTube website (https://www.youtube.com/*).
Functionality
The script works by making requests to the YouTube API to retrieve the necessary data for each channel. It fetches the channel's metadata, including the custom username, and replaces the handle-based username displayed on the page.
Important: Before installing any user script, ensure that you review the script's source and verify its authenticity to ensure your safety and security.
Example 1

Example 2
