There are already many threads that discuss the (dark) theme, why don't you post on one of the existing threads?
Because I wanted to create my own Topic, and I don't see any issue with it.
This is NOT a theme.
This is NOT extension.
This is NOT external script.
This is NOT a plugin.
It is built in feature for brave/chrome browsers
Thanks, I know about this
BUT this is not external script

Hey, ITS WORKING! in Android, but the smileys and the message icon dropdown has a bright colors which is annoying in the eyes

It is good as a whole but is inconsistent with the look of the forum, this happens when I run that plugin.
Play around with options.
I currently use
'Enabled with simple RGB based inversion' and I am testing
'Enabled with inversion of non-image elements'