Usagi is a ronin and an anthropomorphic rabbit (Usagi is Japanese for "rabbit"). She is now on the musha shugyo (warrior's pilgrimage). The Teenage Mutant Ninja Turtles have regularly met paths with the character. Miyamoto Usagi was ranked 92nd on IGN's list of the Top 100 Comic Book Heroes of All Time in May 2011. TMNT (Teenage Mutant Ninja Turtles) is an American comic book series that has been published by Mirage Studios since April 30, 1990. It focuses on a group of teenage ninjas who fight evil mutants and other threats to modern-day New York City. The original team consisted of four heroes: Leonardo, Donatello, Raphael, and Michelangelo. Over time several more characters have been added to the roster. The story begins with four ordinary teenagers who meet by chance in a sewer. They are named after the four knights of the Renaissance era Italian painter Michelangelo Buonarroti Cassai. Each one of them has a unique ability that helps them in their fights against evil: Leonardo is a skilled fighter and swordsman; Donatello is a genius inventor who creates all kinds of weapons and devices for the team to use; Raphael is a powerful mutant whose body is covered in thick fur and whose tongue can cut like a knife; and Michelangelo is a talented sculptor who uses his knowledge to bring the enemies' armor to life so that they can be killed by their own weapons.