A human of low character dies and gets sucked into Equestria as a copy of Twilight. The new mare then proceeds to cause chaos for the ponies, but she tries to help... and, more importantly, make some money
After his sudden death on his way to school due to an idiot driver, Ken Williams wakes up to find himself as a strange quadruped with wings and a horn.
When a remarkable spell summons a human mind into the body of a unicorn filly, Princess Twilight Sparkle does the only thing she can think of: Take on an apprentice.