Name: Diamond Queen
Real name: Queen Emerald
Gender: Female
Occupation: Phantom Thief
Affiliation: The Phantom Thieves
Partner: Roko, Joker, Spade
Weapon of choice: Diamond sword, Playing cards
Transportation: Sky Joker (Rarely), Twin Thunder Shark (Rarely)
Abilities: Using Physical Strength

Queen once trained as a phantom thief with Joker and Spade under the tutelage of Silver Heart, but she now works for Professor Clover. She holds a grudge against phantom thieves and goes around destroying treasures so nobody else can steal them. Her assistant and closest companion is a talking dog named Roku, and her primary weapon is a diamond-bladed sword.