This GUI doesn’t really stick to a consistent spacing or layout. The buttons look like they’re all over the place. Usually, when designing a user interface, it’s best to keep things aligned and spaced consistently so that they look professional.
Here is an example from Refactoring UI, which is a book about designing real user interfaces:
This is really good. My suggestion would be to have another panel pop up after you click the kick/ ban buttons, asking why you would like to remove them from the server. Buttons could say something like spamming, trolling, exploiting, etc. After you click the reason, the player would be removed and see the reason why.
Honestly, I think a lot of people would use this if you found someone to script it.