Kokoro Akechi (明智 小衣 Akechi Kokoro?)
Voiced by: Yoshino Nanjō
The leader of Genius 4 (known as G4 for short), a police investigation unit. She is a bossy girl who looks down on Milky Holmes since they lost their Toys and always claims to boast a massive IQ. She smacks Sherlock with a golden mask whenever she calls her "Kokoro-chan". She claims to have graduated from Harvard University at the age of 13.