Raphael, nickname Raph, is a fictional character and one of the four main characters of the Teenage Mutant Ninja Turtles comics and all related media.
He is usually depicted wearing a red eye mask; in this regard he is the only turtle to retain the color in all media, whereas the others each received a different color. Raphael wields twin sai, the points of which are usually sharpened, as his primary weapon. He is generally the most likely to experience extremes of anger or rage, and is usually depicted as being short tempered, aggressive, sullen, maddened, and rebellious. He is portrayed in most interaction as speaking with a Brooklyn accent.
The origin of Raphael's anger is not always fully explored, but in some incarnations appears to stem partly from the realization that they are the only creatures of their kind and ultimately alone. He also has a somewhat turbulent relationship with his older brother Leonardo because Leo is seen as the group's leader. He is the second eldest of the turtles, and second-in-command. Like all of the brothers, he is named after a Renaissance artist; in this case, he is named after the 16th-century Italian painter Raphael. In 2011 Raphael placed 23rd on IGN's Top 100 Comic Book Heroes, a list that did not feature any of his brothers.
Source: Wikipedia, "Raphael (Teenage Mutant Ninja Turtles)", available under the CC-BY-SA License.