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/co/'s VARIATIONS ON DERPY:
THE DILIGENT MAILPONY: She is a sweet and hard-working mare who everyone likes and depends on. She delivers the mail for Ponyville. Her vision is impaired, but that's all. Respected by all of Ponyville. This version is also known as "Bright Eyes."
THE OSAKA: She is quite often out of it, lost in her own little world. When spoken to she will snap back to reality, but other times she is often daydreaming. Still delivers the mail. Other ponies see her as scatterbrained but dependable.
THE SPACE CADET: Nothing she says makes any sense, at least at first glance. Sometimes her statements make sense in retrospect or have some kind of odd logic behind them. She is not stupid, just completely submerged in her own mind. Everything she says and does makes sense to her; it's everyone else who needs help figuring things out. Still delivers the mail flawlessly. Some ponies see this as proof of her hidden brilliance, others are just baffled. Rarity chalks it up to muscle memory.
THE FULL RETARD: Incapable of saying anything but "derp" and similar words. Borderline brain-dead. Delivers the mail by accident. Walks into walls, often repeatedly, like a wind-up toy. Other ponies just try to make sure she's taken care of.
Did I miss any?