Mcmmo Is already on Aternos but it is really outdated there is a Fully Updated MCMMO version put there by the developers on Spigotmc.org
I really enjoy Mcmmo and would love to be able to put it in a server for me and my friends to use.
https://www.spigotmc.org/resources/mcmmo.2445/
Mcmmo is a plugin that makes minecraft have more mmo style components
