Mainly my white leghorns are skiddish. The black ones are super friendly, and my brown ones are next in line with friendliness. The black ones have figured out that I feed them, so they come running when they see I'm about to open the coop door.
Leghorn chickens are skittish mostly because philologically as well as mentally Leghorn Chickens are more closely related to the Red Jungle Fowl, the wild ancestor of most domestic chickens. If you want a heritage chicken variety or breed, the Leghorns come the closest to fulfilling that desire.