- Crazy Awesome: Angelica Petrocchi. She would not be nearly as effective if she wasn't tone-deaf. She may not be actually nuts, but as Renata put it, she's a "back-to-front genius."
- Family-Unfriendly Aesop: some people, like Gwendolen are born incurable sociopaths who despite being raised by loving, non-abusive parents will become cold-blooded murderers while they're still children
- Harsher in Hindsight: Most of the class bullies anyone who's suspected to be a witch. This can be attributed to Fantastic Racism until it's revealed that most of said bullies are witches, themselves, and know it.
- Jerkass Woobie: Christopher in The Lives of Christopher Chant. You have to feel sorry for him when he is neglected by his own parents and his entire life is planned out after he is outed as a nine-lived enchanter. But his taking his frustration out on the people who are only trying to make him feel welcome in the Castle is a jerkass move.
- Moral Event Horizon:
- In Charmed Life, Gwendolen crosses it when she shows up to help a criminal society kill her little brother to open the way to other worlds.
- In The Pinhoe Egg, Marianne's father and uncles cross it when it's revealed that, rather than kill their father under their mother's orders when he starts getting too uppity, they merely crippled his legs and imprisoned him in a pocket dimension in the woods behind his house for eight years. They felt it was kinder.
- Official Couple: Millie and Christopher. They are shown to be married in Charmed Life, and The Lives of Christopher Chant and Conrad's Fate detail how they met and fell in love.
- Values Dissonance: Michael spanking Gwendolen with a boot and openly enjoying it, and Chrestomanci boxing Cat's ears hard for not stopping Gwendolen, who's dominated him his whole life, would be considered abusive by some nowadays, but maybe not in the 1970s when Charmed Life was written
YMMV / Chrestomanci