User blog comment:Endless Exceptions/Champions Friends and Rivals list/@comment-3476718-20130512130138

I believe that some of this is also based off the various [Fanfiction.net|Fanfiction stories] that the Internet happens to offer.

Some pairings are not exactly canon, but more like paired together according to popular belief, especially the Demacian lores, since they're technically never mentioned together as "friends" at all.

While some canon friendship/rival relationships exist, like being friends with, and  being rivals with , I do not understand where you got the information that ,  and  happen to be "friends", or why  and  would be rivals. Are they friendly rivals? Or arch enemies?

Besides, there are a lot more than just "friends" and "rivals". "Allies", "siblings", and "apprentice" are more examples of what relationships mean.

TL;DR, some of these just aren't according to Riot's lore. seems to be pretty accurate, though, so maybe you should get your info from there.