Quote from Burrito, theme creator:
DarkWii Plus by Diddy 81 (from the Wii Theme Team) and Burrito
Diddy created the theme, and I gave him all of the ideas, visual elements to be retained and changed, etc. This theme's conversations started on July 27, 2020, and ended on August 15, 2020, which was a LOT of emailing, so I hope you enjoy.
The DarkWii Plus theme is designed to give a dark overhaul to your Wii's system menu, without making it ugly. Things like the health screen, disc channel, and others, are unchanged. Some UI elements are darkified. The end result is a dark theme that feels native to the Wii itself.
It is based on the original DarkWii theme by Slazor, with some elements by the Wii Theme Team, while aiming to look native and stock.
HOW TO INSTALL: https://wii.guide/themes
TL;DR: This is basically the one dark theme to rule all dark themes if you want a native looking dark theme.