What's the best way to fade the background but keep the sprites the same?
Viewing post in Fade Street [GB Studio Plugin] comments
In colour mode, it should work with any event other than the automagic events.
In any of the events, if you leave the sprite palette selection on "Don't modify", you can make whatever change you like to the background palettes and the sprite palettes will stay the same.
For DMG events, just check the box for "Affecting BGP", and uncheck the boxes for "OBP0" and "OBP1".
(If you wanted to keep the sprites visible during a scene change, you would also need to make sure that exactly the same spritesheets are loaded in both scenes, so there aren't any glitches as VRAM updates. And make sure that sprites have the same positions on screen in both scenes.)