Themojis - A different image for an emoji depending on the applied theme.

Emojis can play an important part in creating a memorable Discord sever, but you're kind of limited in terms of usable colors due to having to account for both light and dark themes. While it is true that most people use dark mode (because it's better looking and applied by default), there will always be the small minority who use light mode, and it'd be better to optimize emojis for a specific theme than to account for both. It increases visibility of the emoji as it can allow for more contrast with the background, and there isn't much of a downside to this being a feature. Naturally, something like this makes sense because to clearly see an icon on light theme it needs to be dark, and for dark theme it needs to be bright. Right now we can "meet in the middle" but that isn't the best solution.