Hello,
For some times ago I was trying to put on my server Libs Disguises. Otherwise this addon seems to hasn't been updated yet since 1.13.2 Minehut version.
I suggest to update this addon, it still could be useful to disguise as anyone else for... multi purposes.
Here is the last version link : https://ci.md-5.net/job/LibsDisguises/
For more information, you can read the main page of LibsDisguises - https://www.spigotmc.org/resources/libs-disguises.32453/