September

September is a male Earth pony who appears in the IDW comics, typically in the background of comic panels.

Development and design
September is a reference to the Fringe character of the same name, who is one of the Observers—evolved humans that can travel through time and space. His lack of visible tail hair is akin to the Observers' baldness, and his random appearances in the comics also allude to the Observers' appearances at key points in Fringe's history. He is similar to "Slendermane".

September'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, September appears on page 17 of Issue #1, after the changelings' invasion of Ponyville is thwarted; on page 20 of Issue #2, when the Mane 6 are traveling through the Forest of Leota; on page 11 of Issue #3, when Twilight Sparkle and Fluttershy are traveling through the forest by themselves; and on page 21 of Issue #4, when the ponies, Spike, and Princess Celestia are at a campfire.

In the story arc Zen and the Art of Gazebo Repair, he appears on page 19 of Issue #9, in the background behind Zecora, and on page 16 of Issue #10, among other ponies at the Summer Wrap-Up Hoedown Corral.

In the story arc Neigh Anything, he appears on page 13 of Issue #11, at the Canterlot Academy Fall Formal pep rally, and on page 21 of Issue #12, at the Fall Formal Gala.

In the story arc Reflections, September appears on page 1 of Issue #17, directly addressing Twilight Sparkle, on both cover A and page 14 of Issue #18 in the background, on both a sheet of paper on page 3 and page 11 of Issue #19, and on page 11 of Issue #20.

In the Issue #9/My Little Pony Annual 2013 story "The Fall of Sunset Shimmer", he appears on page 2 with a briefcase.

My Little Pony Micro-Series
In the Issue #3 story How Rarity Got Her Groovy Back, September appears on page 20, at Rarity's "Art of the Dress" fashion show. He appears in the same shot on Dynamic Forces' cover RE of the issue.

In the Issue #10 story The Day Shift, he appears in the foreground on page 18, standing atop a platform labeled "OBSERVATORY".

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

- page 1