Sextina Aquafina is a fifteen year old Dubstep wunderkid as described by A Ryan Seacrest Type and a minor recurring character in BoJack Horseman.
Little is known about Sextina's background. She was born circa 2000 (A Ryan Seacrest Type describes her as "a 14-year-old Dubstep wunderkind" in Prickly-Muffin), and says she was a big fan of Sarah Lynn as a child.
In Brrap Brrap Pew Pew, Diane becomes the ghostwriter for Sextina's Twitter account and accidentally tweets (as Sextina) that she's getting an abortion. The resulting controversy helps Sextina's career, and Sextina pretends that she had an abortion. In the end, Sextina actually does become pregnant and wants to keep the baby. As a result, Diane and Princess Carolyn work together to hide this pregnancy.