Description:

Spoiler

Rei Furuya a.k.a Tooru Amuro a.k.a Bourbon : The only person currently alive in the main Detective Conan series

Jinpei Matsuda : Before joining the MPD in the main series, he was in a bomb disposal unit. He died after purposely failing to defuse a bomb in a ferris wheel to inform Miwako the location of the other bomb

Kenji Hagiwara : Matsuda's friend who died years before Matsuda in a similar bomb case

Wataru Date : Takagi's senpai; Takagi was once mistaken as Date when he visited the family of Date's girlfriend after Date's death

Hiromitsu Morofushi a.k.a Scotch : brother of Koumei who killed himself in front of Shuuichi Akai

Spinoff of Amuro and Co. during their Police Academy Days.For those who didn't remember the characters (heavy spoilers, not recommended if you haven't reached at least chapter 1000):