September Mackintosh

September MacIntosh, a bit shorter than Candace, maybe about Buford's or Jenny's height, is a long-haired girl who goes to Danville High and plays trumpet in the marching band. It is shown that She is also very talented in biology, has top grades and is in advanced classes. For this reason, Candace and Stacy view her as a bit of a nerd. However, it is shown that she is not a nerd as she has no nerd words.

September is quirky and not at all afraid to speak her mind, which sometimes lands her in trouble and inspires a sense of awe in her fellow teenagers. She scorns some of the activities as might be expected for her age; for instance, she hates shopping and has no cell phone. She has an avid interest in Phineas and Ferb's inventions, often coming by to see what they're doing or even with the intent to help out. At Isabella's suggestion, she eventually joins the Fireside Girls as she was in an Irish troop when she was little, however she is rarely seen wearing the Fireside Girl uniform, unlike Isabella.