Gentleman is very kind even though he is secretive at first glance. It seems that Gentleman is very still and very serious, but when Yomiko is upset at Joker because she needs more money to buy books, Gentleman laughs and says they will give her the Second Volume of the book.

Gentleman is Joker's boss. Joker needs Gentleman's approval for the plan. Gentleman is a very important person in the world of politics, as he is the head of the Royal British Library's Division of Special Operations.