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Luka Macken (ルカ・マッケン)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.