Which one of the Teenage Mutant Ninja Turtles wears a purple eye patch?

None of the Teenage Mutant Ninja Turtles wear a purple eye patch. The turtles are known for their distinct colored masks: Leonardo wears blue, Michelangelo wears orange, Donatello wears purple, and Raphael wears red. If you are thinking of a character with an eye patch, it might be a different character from the TMNT universe, such as a villain or supporting character.