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April O'Neil is a young Human woman who has appeared in virtually every version of the TMNT-franchise. April is usually the Ninja Turtles first human ally in most incarnations, and is generally portrayed as being a very good friend of the Turtles: Leonardo, Donatello, Raphael, and Michelangelo, often acting as a big sister/motherly-figure to them. April's love interest in the TMNT-franchise is Casey Jones, who's also a close friend/human ally of the Turtles.
April made her first appearance in the Mirage comic series in 1984 as a computer programmer. She was later portrayed as a strong-willed news reporter in the Turtles' first animated series, as a warrior in the Teenage Mutant Ninja Turtles Adventures comic produced by Archie Comics, and various other personas in different TMNT media. April was later voiced by Renae Jacobs in the 1987 animated series, in the 2003 animated series by Veronica Taylor, and by Sarah Michelle Gellar in the 2007 film TMNT. In the 2012 animated series, April is voiced by Mae Whitman. In live-action media she has been by Judith Hoag (1990), Paige Turco (1991 and 1993), and Megan Fox (2014).