Genius 4
The Genius Four (ジーニアスフォー), or G4 for short, is the section team of the police department established to handle all Gentlemen Thieves related incidents as they continue to increase. Whilst the members don't possess any Toys, they have their respective capabilities making them the third faction in the Milky Holmes anime.

In Futari wa Milky Holmes, they were assisting other police departments with paperwork with the lack of Gentlemen Thieves incidents happening.