In your /plugins folder, open Project Korra. Open the language.yml folder and turn it off. There will be a boolean (true/false) at the very top. When you disable that, the prefixes will be gone. After you do this, if you have Essentials, the players chat will look like (using my name as an example) <xNuminousx>:. To change this, go into Essentials config.yml>Scroll all the way down until you see the "Chat" section, follow the direction to give your players a unique chat appearance to fit your server. You can change chat color, add shapes and symbols, etc. You can even split it up by group. For example, default may have a white chat color where as your server staff memebers could have a yellow chat color to make them stand out. Good luck!