This 'skin' replaces the "About" page - accessible via the top most button (looks like an M) on the left hand side of the plugin.
How to install? Download the zip file and copy/replace the "About.png" from the folder "skin file" into the folder:
C:\Program Files (x86)\FL Studio 21\Plugins\Fruity\Generators\Harmor\Artwork
In the zip is another folder "original file" if you want to switch back and forgot to make a backup of the replaced file.
Enjoy
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Why FL-Chans / Anime Girls?
I like the thought of plugins being characters/personalities, interacting with each other and contributing their voice in a call-and-response manner. It feels more natural and engaging to me than a purely mechanical tool/office application. It's more like "hanging out with your friends" this way. Plus: Seeing the characters floods my brain with short bursts of happy feelings, which is motivating and inspiring to me and keeps me going.