Luka Macken is Jim Macken's younger brother. Luka is a lighthearted young child and very supporting of his older brother, saying whatever Jim wishes has to come true. In episode eight when Jim tells Luka to never leave his side, Luka replies with Claude's line, "Yes, your Highness." **His name is officialy "Luka Macken" and not "Luca McCain" or similar. Read the Black Tabloid (page 10) to confirm.
Later in the same episode, Jim calls out for Luka but gets no answer, and finds him lying on the ground dead. He was the previous contractor of Hannah and the contract was to burn the whole village to fulfill Alois's wish.