So what are the perks of having a champion that is friends with another? Are there any? and if you don`t know what i mean 
and 
are friends (in there story). So if you know please leave a comment.
Do you mean like if there are ingame benefits? Because no, other then some of the newer champs having cool little easter egg lines
Nothing really beyond personal preference.
None.
I mean there's little easter eggs. Like if Lucian or Ekko run from anyone champion with a Constable skin they get 1 increased movement speed. And anyone wearing glasses playing against Leona get 1 magic resist I think.
Sadly no, some champions don't have anything great if they're friends with another, if anything, rivals have better odds at events and effects than allies. Which is sad.
