Fridge Brilliance: One rarely speaking minor character is a goth girl who, whenever she does speak, never has the same voice (even though it is Tabitha St. Germain voicing her every time). But in "Awesomely Different Drum Major" we see her in a whole group of identical goth girls, so it may not be the same girl every time.
In the credits the Trishas are called Trisha #1 and Trisha #2. Though they never outright state which one is which, you can tell the one in pink is Trisha #1 if you pay close enough attention. She talks the most and appears to be slightly smarter.