Mavis

Mavis is Marvella's twin sister and a minor character in the Hero's Guide series.

The Hero's Guide to Saving Your Kingdom
Mavis and Marvella are only mentioned. They're first mentioned to be known for painting each other's toes- not their toenails, their toes. They are also mentioned to be present at Duncan's wedding.

Trivia

 * They are known to dance to imaginary music, literally paint each other's toes, walk their pet crickets on leashes and constantly sniff each other's hair.