A Ninja is a mercenary who is trained in the art of ninjutsu, or a martial-arts style which involves stealth, speed, and a mastery of various weapons. Incredibly efficient and deadly combat tactics, and the will to commit seppuku, or suicide, to defend the honor of a particular family or clan.
A Ninja is a Light DD [Damage Dealer], and use a Katana.
Ninja Char[]
This class also gets a "new look" upon reaching certain levels.