In previous Ultimas, humanity followed the Virtues, a set of principles founded by lord British to maintain order over choas. While the virtues still exist, they are not as deeply followed as they once were. This ain't your granpappy's Ultima.
Humanity has keen perception, thus they get an extra crossbow skill.
Humanity follows the Great Houses, lead by Moriah. The great houses have put up a ban on technology and are greatly opposed to the philosophy of the machine. Humanity tends to be easily swayed by the temptations of Sosaria and are very diverse creatures. Though their hero, Lord British, is gone, his memory live on. The Juka are a strange people.