- "Toys are powers that bud from the hearts of the chosen. There are those that use them to steal. They are known by the name of Gentleman Thieves."
- — Series Narration
Gentlemen Thief Empire[]
Henriette Mystère a.k.a. Lady Arsene is the leader of the group. They are the main rivals of Milky Holmes. The other members are Rat, Stone River and Twenty.
Gentlemen Thief L[]
The Famous Gentleman Thief that disappeared after an accident during his fight against Opera Kobayashi, but rumors have that he survived.