This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. If an article link referred you here, you might want to go back and fix it to point directly to the intended page.
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 oftentimes Casey Jones, who's also a close friend/human ally of the Turtles.