I believe you are referring to the &k color code.
#Luckperms ranks
stuck shuttle
The process of defining the prefix for a rank is relatively straightforward. It involves specifying the desired prefix, which can include the utilization of color codes and other formatting options.
To streamline this process, you can use the "/lp editor" command, which provides a user-friendly web-based interface for making these adjustments.
You could add &kX to the start and end of the prefix.
stuck shuttle
Add &r or a specific color code after the last &kX
stuck shuttle
Add the proper color codes prior to the &k
There isn't a color code before the &k, meaning it will display without any color.
The color code you are using, &r, removes all formatting, it's not actually a color.
What plugin are you using for chat formatting?
Personally, I use Chatty: https://www.spigotmc.org/resources/chatty-lightweight-universal-bukkit-chat-system-solution-1-7-10-1-19.59411/
