F

F (フ Fu), real name Justin Ferrera (ジャスティンフェレーラ Jasutin Ferera; born 8 September 2002) is one of the three detectives who hunt down the Kira in Death Note: Black Mercy.

Background
He, M and V once considered eachother as siblings. This was until Near called them and told them they had to take the positions of the three world-known detectives L, Deneuve and Eraldo Coil. They became eachothers greatest opponents.

First Part: Maaike van der Kooij
Suddenly a lot of deaths occur in the Netherlands, mostly of criminals. But then the Dutch government hires in detectives M, V and F to hunt down this new Kira. V finds information on the Kira, Maaike van der Kooij quickly, but it is stolen by M who takes action on her own and goes to Maaike's house. She was disguised but with her Shinigami Eyes Maaike pierced trough it and was about to write her name down as she was killed by a heart attack. It was later revealed F's teammate Shiroi was a Kira the whole time.