|Full Name||Kelsie O'Fallon|
|Date of Birth||September 14, 2000|
|Main Weapon(s)||Orange lightsaber-like weapon, spikes on gloves|
|First Appearance||Cartoon Network: Millennium|
|AGRA (Anti-Gem Resistance Association)|
Her father, Winston D. O'Fallon, started the rebellion when Peridot took over. He led them into her fortress, where they tried to overthrow her. In a deadly battle, Peridot wiped out Winston, leaving Kelsie with the remaining members of the resistance. Since then, she has grown up to hate Gems, especially Peridot.
Kelsie is always determined to do the right thing, but she is afraid of failure. This fear leads her to demand her allies to follow her exact directions at all times. However, she is lonely on the inside, and wants to get a fresh start after overthrowing Empress Peridot.