Unfortunately my only pony representation at this time, as I can’t draw (yet).
A few details:
Coat color like Twilight Sparkle’s, because she’s the best and I identify with her the most. (I’m a fucking NERD.)
Tail color like Rainbow Dash’s, because she’s really great, I used to run really fast when I was young(er), and I’m 85% hetero. ;P
Blond hair, because when I was young my hair was pretty much like a sun, now it’s much lamer. Also meant to evoke “Super Saiyan”. ;P
Fangs, because those are super cute/cool. Think Suigetsu, Piccolo or Inuyasha.
Collar, because collars fucking rock.
Wings, because flying would be really great and I love the extra expressivity. I type with my wings!
The cutie mark is not drawn yet. It would be a blue fish confidently looking at you, with a tail with 8 round arches, possibly a shark-like dorsal fin, and would be facing the rear, since I like going against the flow so much, empirically.