Queen Lydia is George's mother. She murdered his father and usurped power of the Kingdom of the Sun, making it a generally rotten place to be.

Evil Sorceress Linda is George's jealous little sister. She's in love with Paul, for reasons that I, personally, don't understand, and thus is constantly trying to marry him and kill Polly.

Cat the Frog used to be a very confused adept. Now she's a very angry frog with an attitude. She hates Paul, for no apparent reason, and thus her goal in life is to make him miserable.

Stu Partridge is Polly's evil older brother. He spends large amounts of time making her life miserable.

The Evil Bearded Goat God is just generally a pain. He likes to play chess; his greatest rival is the Great Llama, and his greatest chess rival is Jack.

Elekbah only shows up once, but she is, without a doubt, the scariest villain in all of the Groovy Book.