Characters who should have been called by the Map

[TheUnknownPhantom5 67]

Diamond Tiara. There should have been more episodes with her after her redemption, and being called by the Map might have been a good way to help her learn more about friendship by helping others.

The Student Six. They were pretty wasted in favor of the Mane Six. If the writers wanted them to be important, then maybe a map episode might have been good for them.

Celestia, and Luna. Just to see Twilight's reaction, because you know if Princess Celestia, and Princess Luna got calle by the map Twilight would have a stroke.

[Props Valroa 26,038]

I would have liked to see Maud, and Trixie called by the map. 

[ZiggWheelsManning 7,359]

Daring Do, I don't think she even knows about Twilight's castle.  

[Reality Check 627]

I kinda like to see someone among the pillars get summoned by the map, especially Stygian

Oh and maybe Shining Armor and Cadence, they seriously need character