Josephine "Jo" McCormick is the Red Striker Beetleborg, and later the Platinum Purple Beetleborg in the second season.
Jo is Drew's little sister, she was granted the ability of super strength by Flabber, which she activated by cracking her knuckles. After Roboborg arrived, Jo received an upgrade, Mega Spectra Platinum Purple Beetleborg, after Nukus and Vilor went Mega themselves. Her Red Striker armor was modeled after a female Japanese Rhino Beetle, and her Platinum Purple armor after a ladybug. Jo is often shown wearing a baseball cap backwards.
A unique casting change occurred and instead of an official departure removing the character Jo from the cast, when Shannon Chandler left the series, her character remained. Halfway through Season 1, Wolfgang, while playing with a magic book, accidentally cast a spell that caused Jo to change in appearance. Brittany Konarzewski took over Chandler's role in the guise of actually being the original Jo with a new look and voice. To counteract this, Flabber used his magic to make her look and sound the way she always had, but it didn't work on anyone who actually watched the spell being cast. So the viewers, Flabber, Drew, Roland, and Jo herself could still see Jo in her new appearance, but the Hilhurst monsters as well as their family and friends saw her as she looked before.