So, this is the truth of General Firefly... I love it! HEADCANON TIME: Firefly was Celestia and Luna's General since before NightMare Moon. Shortly after Luna was banished, Celestia made the loyal and steadfast Firefly into an alicorn in the hopes that she could help raise the Moon, but Firefly did not have the unicorn power to do so. She used her alicorn power to help stem the chaos from the pro-Luna and anti-Celestia extremists that came out of the woodwork after NightMare Moon, and subsequently lost her horn in battle. Her special talent was to fly as fast as lightning; the fire is from the impact of lightning against the earth. She founded the Wonderbolts in the hopes that they could curtail NightMare Moon on her return, so that the Elements of Harmony could be more easily retrieved.