Always waiting for his retainment, and always handling with a troubling case that put the rest in danger, Arthur Bloch is the old mentor of Dylan Dog. They know each other since Dylan start as bobby, and they kept in contact when he left Scotland Yard. Dylan is often asking him advice, and even more often border-legal help and secret information. Bloch always refuses...at first. They saved each other uncountable many times, and also if time to time they rude, they're very good friends.