Samuel was a vampire and a member of Foe's gang.
It is later revealed in the final battle that he is a vampire, and he attacks Skulduggery Pleasant. Skulduggery responds by lifting him up into the air and dropping him, breaking all the bones in his body. Samuel survives as he is a vampire, but is arrested.
When the war breaks out, Supreme Council operatives break Samuel out of his prison, along with Foe, Charient and Obloquy. They are recruited by the Supreme Council to hunt down China Sorrows. Samuel caused Chin great harm, breaking her ribs during the ambush at her estate and breaking her collarbone and ribs(again) at Eliza Scorn's Church of the Faceless. Later, along with the remainder of Foe's gang, he is tortured by China Sorrows and agrees (under threat of death) to work for China.
Samuel was described as being very quiet and dangerous.