September

A male Earth pony who appears in the IDW comics.

Development and design
He is in reference to the Fringe character September, an Observer. The pony's lack of visible tail hair is similar to the Observers' baldness.

This pony's appearances are added by artist Andy Price, including a speaking role as part of an unscripted scene in the story Reflections Part 1.

My Little Pony: Friendship is Magic (comics)
In the story arc The Return of Queen Chrysalis, he appears on page 17 of Issue #1, on page 20 of Issue #2, on page 11 of Issue #3, and on page 21 of Issue #4.

In the story arc Zen and the Art of Gazebo Repair, he appears on page 19 of Issue #9 and on page 16 of Issue #10, and in the story The Fall of Sunset Shimmer, he appears on page 2.

In the story arc Neigh Anything, he appears on page 13 of Issue #11 and on page 21 of Issue #12.

In the story arc Reflections, he appears on page 1 of Issue #17 and on cover A of Issue #18.

My Little Pony Micro-Series
In the story How Rarity Got Her Groovy Back, he appears on page 20/Dynamic Forces cover RE of Issue #3.

In the story The Day Shift, he appears on page 18 of Issue #10.

Quotes
"Twilight Sparkle... There is more than one of everything."

- Friendship is Magic Issue #17 page 1