@Background Pony #AD7A
 
Neither Celestia nor Luna is present. The bird is Litra, the two bipeds are Eleking (with the horns) and Gomora (big ears).
 
The pony on the left was identified much later as an adaptation of an OC by Heilos, whose name is Harmony, as she was created as an interpretation of what we’ve since identified as the Spirit Of The Tree Of Harmony.
 
The difference between Lady Harmony and Treelight Sparkle is that Lady Harmony and her many alternate interpretations at the time were developed well prior to Season 9 or any previous, CANON indication that the Tree Of Harmony was sapient.
 
That said, you should check out Lady Harmony’s OC tag. Lots of other interesting pics with her in them.
 
As for the adaptation of Lady Harmony that appears in The Bridge, she’s more suffering a Deus Exit Machina at present, which leaves her unable to do much, while specifically NOT killing her off.

Um is that calestia of Luna also I think that oc is gonna die

Mystery OC has been ID’d and tagged.