April O'Neil

April O'Neil was a close friend of the Turtles.  During college, she worked an internship at StockGen, Baxter Stockman's company.  Here, she met some of the test subjects, four turtles and a rat.  She gave the turtles their names pulling from a Renaissance history class she was taking at the time.  Casey reintroduced to the Turtles again after they had been fully mutated.  Her connections at college and StochGen as well are her scientific knowledge have proved invaluable to the Turtles.  Her abilites in this series have skewed more toards the covert espianage and information gathering than in any other series.

Through the course of the series she helped the turtles break into StockGen to rescue Splinter, offered them asylum at the Second Time Around antique shop, uncovered Dr. Miller's involvement with the Foot, worked with Aka to learn a weakness in Kitsune, brokered a deal with Null to save the Turtles, and worked as Baxter Stockman's campaign manager.