Back in late August/early September 2017, Mr. Pruett shared some early concept sketches (some of which includes unused characters) on Twitter. I thought it'd be a good idea to compile them here, since... you know... why doesn't this wiki have these, again?
- Early Cavendish and Dakota. Pruett adds that Cavendish had always been dapper and Dakota has always loved food, bit it seemed that Dakota used to be the taller one.
- Early designs for Sara.
- Early sketch of Martin... plus a more final design from Dan Povenmire.
- Early designs for Brigette and Bradley. Looks like they switched who'd wear the glasses.
- Early design for Principal Milder, and an unused janitor character. The janitor's eccentric character has been adapted to Scott.
- An early, younger-looking Mr. Drako.
- Melissa used to have a hamster nemesis named Ham. It was an idea on the presentation board for years until it was finally discarded.