Shipping is the act of taking two characters from a series, reality or cartoon, and putting them together. Some ships end up being okay while others can be terrible. It's basically a relationship between characters that a fan wants to happen.
i enjoy how we jumped right on certain background ponies but we have yet to accept certain canon ponies into our fanon. I have read absolutely NO fanfics with junebug and this is the first artwork i've seen done of her
Probably because they are more easily exploitable since sometimes a single line of dialogue can establish a personality. I have yet to see fic about "The Horror" Trio, even though for me Rose has the best design.
Part of it I think stems from the fact that the less they are defined as a character in the show, the more it is left to the fans' imaginations to create a persona for them; it's a bit more freedom for creativity with ponies that have a more distinctive character design than other background ponies, and not being constrained by canon, if that makes any sense.