Caroline Miller is a former main character and is Malcolm's overly earnest teacher. She is very passionate about her job and really loves Malcolm so much as her favorite student. She is extremely emotional. Francis even used this to his advantage to help pay a hospital bill to stitch up Malcolm's injury. She adores Malcolm due to his high intelligence.
Caroline has been noted to have a few romances and to have one unnamed boyfriend (the janitor she was talking to about Lamaze class) who got her pregnant. She was pregnant with this baby throughout most of season 2, until she gave birth in the school parking lot, as the result of a mis-programmed model rocket intended as a prank by the Krelboynes.
After giving birth to her child, at the beginning of season 3, Caroline went on the maternity leave and could no longer be their teacher. As a result, she was replaced by Lionel Herkabe, a more evil and sadistic teacher, who ruined the Krelboynes class for them and became an antagonist of the show.
- Home Alone 4
- Krelboyne Picnic
- Lois VS Evil
- Stock Car Races
- Funeral (Cameo)
- Cheerleader (Cameo)
- High School Play (Last appearance)
- In the episode Home Alone 4, it was implied that she was either sexually or romantically intimate with the school janitor.
- Originally Caroline was supposed to return for season 3 as a much darker and cynical character, taking her anger out on the Krelboynes for the rocket mishap which nearly endangered her and her daughter's life. Her ex-boyfriend, a successful billionaire businessman and former Krelboyne, Mr. Herkabe, shows concern over this and reports her to Principal Littledove. 
- She is the only non-family member to be credited as part of the main cast in the intro.