I haven't spent much time drawing in /MLP/ recently, and most of these pics are old enough that the exact requests for them I can't even remember.
The upper left I just made a few minutes ago however, and it's from a Colt Cuddler thread.
Upper right is Hope from the Satyr threads. 'Fraid I don't know much more about her than that. I also drew some reverse-satyr for fun, but I can't find any of the pics...
Lower left is my attempt at a "badass Nurse Readheart"
Lower right is Scoots with a Scooter, obviously. The request wanted that scooter in particular, though I couldn't tell you which one it was.