Quote Originally Posted by sanahtlig View Post
Preliminary evidence (2 runs with an account set to 6 different primary eidolons of one element) suggests the friend eidolon priority isn't based on the eidolon's characteristics at all, but instead on the party letter they're assigned to. A gets priority over B, B over C, etc. I'll need one more data point to confirm this (I shifted the eidolon in group C to group B, and the eidolon in B to C, with group A as my active party). I've done my testing with all LV1, LB0 eidolons, so it's still possible that such parameters could take priority and I've simply blinded myself to them. Further testing (two additional data points) would be required to rule this possibility out.
I was about to post on this point that this is what I also found, that the priority falls on the main eidolon in order of Party Letter. I changed between 4 different dark eidolons in Party A and it reflected what was shown to my friends (observed via alt account in real time, updated nearly instantly.) When I removed a dark eidolon from Party A completely, the dark eidolon I have in Party B showed up for friends.