Moi!
Undertaker is, as his name suggests, a funeral director and a 'retired' shinigami. He often works with corpses resulting from movements in the underworld of the United Kingdom and acts as Ciel's informant. He seems to have known Ciel's father, Vincent, as he appears as one of the "Evil Nobles". He is a rather eccentric man, almost always wearing a smile, and wishes to hear a funny joke for his services instead of receiving any of the "Queen's money". He shows a strong disdain for the Queen.
Hehe....
Say hello!