Additionally, I did something that I think is seriously brilliant. Unfortunately, more from the perspective of a developer than a modder. Strangely enough I haven't seen this in any game, not sure why.
I made a tool that allows you to use the built-in tools for tinting images for any character customization. But, why is this easier to use from the developer's perspective than the modder's? Because when drawing a character we have many layers, so it's no problem to save the layers separately (outline, hair and body). Whereas I would have to manually separate them in photoshop which is... problematic and time consuming.
Anyway, below are some examples of what this tool can do. The selected color parameters are saved and can be used in any subsequent scene, which means that the user can select millions of different variations and the changes to the character will be visible in any scene.
Please tell me whether you like it or not.