Character of people born on January 1?

Attributes assigned to birth dates begs a discussion of the zodiac, whether or not you believe in such things. There are lots of defining parts of Astrology that set in motion certain characteristics, such as time born, moon and sun ascendancy, and a host of other factors, not to mention your home life and upbringing. I would recommend researching astrology to further define your answer. However, the quick thought would be:

People born on Jan 1 are Capricorns.

(excerpt taken from http://magickalcircle.com/uncategorized/characteristics-of-capricorn-january-1-7th)

Capricorn is a Cardinal Sign ruled by the planet Saturn and the symbol is the goat. "Overall, the Capricorn personality is said to be serious with feeling of responsibility... They tend to be conservative, patient and persistent and rarely give up... They have a tendency towards dictatorial behavior and act as if they are authorities on many subjects and if they make a mistake, they will rarely admit they are wrong if at all"

Specifically, those Capricorns born on New Years:

"Characteristics include authoritative, principled, easily frustrated, emotional, responsible to the point of taking on more than they can handle."

Here's an interesting list of noteworthy folk born on Jan 1st. (http://www.nndb.com/lists/518/000106200/) A study of their life similarities might provide you with greater understanding.