this plugin is realy good
its called Friends Plugin
this plugin allow players to add/remove friends to a list
this playing will noties when his friend(s) go online or offline
this plugin will be on all over the server(if this is able)
i have a vedio about this plugen :
https://www.youtube.com/watch?v=GyMH_0i1ciw
i hope you add this plugin thanks :)